[RISCV] Implement prolog and epilog insertion

[asb]

Summary

As frame pointer elimination isn't implemented until a later patch and we make extensive use of update_llc_test_checks.py, this changes touches a lot of the RISC-V tests.

[mgrang]

lib/Target/RISCV/RISCVFrameLowering.cpp

94

nit: Period after comment.

111

nit: Period after comment.

167

nit: Period after comment.

lib/Target/RISCV/RISCVRegisterInfo.cpp

76 ↗

(On Diff #122262)

nit: Period after comment.

[asb]

Address @mgrang's review comments (thanks!). I also moved the changes to eliminateFrameIndex to the previous patch, as it makes sense to just do it right from the start.

[glasnak]

lib/Target/RISCV/RISCVFrameLowering.cpp

31

shouldn't this be uint64_t?

(also not sure about MaxCallFrameSize below, as alignTo() returns uint64_t. It gets two unsigned ints, so I'll leave that up to you if it's necessary to change just to satisfy linters)

170

redundant return?

[asb]

Rebase and address review comments.

[mgrang]

LGTM.

[sabuasal]

lib/Target/RISCV/RISCVFrameLowering.cpp

90

How should we handle cases where we need a bigger stack?

[asb]

lib/Target/RISCV/RISCVFrameLowering.cpp

90

Handled in a future patch: https://github.com/lowRISC/riscv-llvm/blob/2ebc17dce3c6bce09df2abb86ad208b290eebaee/0028-RISCV-Support-stack-frames-and-offsets-up-to-32-bits.patch

[asb]

Refreshing the patch. Just awaiting the dependent frameindex patch to be reviewed in order to merge.

[reames]

small drive by comments.

lib/Target/RISCV/RISCVFrameLowering.cpp

130

You've got these in a couple of places, time for an alias in the enum?

test/CodeGen/RISCV/addc-adde-sube-subc.ll

10

The test churn in this patch is really unfortunate. Is there a small change you can add to not need all the spill code for most functions?

[asb]

Rebase patch, and address minor review comments.

[asb]

Rebase and use an adjustReg helper (this minimises the diff for D40807).

lib/Target/RISCV/RISCVFrameLowering.cpp

130

I've added some helper functions to return FPReg and SPReg. They take RISCVSubtargetInfo to allow future extensibility (e.g. different ABIs).

test/CodeGen/RISCV/addc-adde-sube-subc.ll

10

Frame pointer elimination isn't a particularly large change (see here). Although verbose generated code has disadvantages, I think there are benefits to "completing" codegen before supporting extra optimisations, even fairly trivial ones. Although ultimately a straight-forward change, a large percentage of the bugs I've encountered while developing the backend have actually been related to frame handling (whether as part of argument passing or otherwise).

lib/Target/RISCV/RISCVFrameLowering.h

 namespace llvm {
 class RISCVSubtarget;
 
 class RISCVFrameLowering : public TargetFrameLowering {
 public:
   explicit RISCVFrameLowering(const RISCVSubtarget &STI)
       : TargetFrameLowering(StackGrowsDown,
                             /*StackAlignment=*/16,
-                            /*LocalAreaOffset=*/0) {}
+                            /*LocalAreaOffset=*/0),
+        STI(STI) {}
 
   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
 
   int getFrameIndexReference(const MachineFunction &MF, int FI,
                              unsigned &FrameReg) const override;
 
+  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+                            RegScavenger *RS) const override;
+
   bool hasFP(const MachineFunction &MF) const override;
 
   MachineBasicBlock::iterator
   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                                 MachineBasicBlock::iterator MI) const override {
     return MBB.erase(MI);
   }
+
+protected:
+  const RISCVSubtarget &STI;
+
+private:
+  void determineFrameLayout(MachineFunction &MF) const;
 };
 }
 #endif

lib/Target/RISCV/RISCVFrameLowering.cpp

 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 
 using namespace llvm;
 
 bool RISCVFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
 
+// Determines the size of the frame and maximum call frame size.
+void RISCVFrameLowering::determineFrameLayout(MachineFunction &MF) const {
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+  const RISCVRegisterInfo *RI = STI.getRegisterInfo();
+
+  // Get the number of bytes to allocate from the FrameInfo.
+  uint64_t FrameSize = MFI.getStackSize();
+
+  // Get the alignment.
+  uint64_t StackAlign = RI->needsStackRealignment(MF) ? MFI.getMaxAlignment()
+                                                      : getStackAlignment();
+
+  // Get the maximum call frame size of all the calls.
+  uint64_t MaxCallFrameSize = MFI.getMaxCallFrameSize();
+
+  // If we have dynamic alloca then MaxCallFrameSize needs to be aligned so
+  // that allocations will be aligned.
+  if (MFI.hasVarSizedObjects())
+    MaxCallFrameSize = alignTo(MaxCallFrameSize, StackAlign);
+
+  // Update maximum call frame size.
+  MFI.setMaxCallFrameSize(MaxCallFrameSize);
+
+  // Include call frame size in total.
+  if (!(hasReservedCallFrame(MF) && MFI.adjustsStack()))
+    FrameSize += MaxCallFrameSize;
+
+  // Make sure the frame is aligned.
+  FrameSize = alignTo(FrameSize, StackAlign);
+
+  // Update frame info.
+  MFI.setStackSize(FrameSize);
+}
+
 void RISCVFrameLowering::emitPrologue(MachineFunction &MF,
-                                      MachineBasicBlock &MBB) const {}
+                                      MachineBasicBlock &MBB) const {
+  assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
+
+  if (!hasFP(MF)) {
+    report_fatal_error(
+        "emitPrologue doesn't support framepointer-less functions");
+  }
+
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+  const RISCVInstrInfo *TII = STI.getInstrInfo();
+  MachineBasicBlock::iterator MBBI = MBB.begin();
+
+  unsigned FPReg = RISCV::X8;
+  unsigned SPReg = RISCV::X2;
+
+  // Debug location must be unknown since the first debug location is used
+  // to determine the end of the prologue.
+  DebugLoc DL;
+
+  // Determine the correct frame layout
+  determineFrameLayout(MF);
+
+  // FIXME (note copied from Lanai): This appears to be overallocating.  Needs
+  // investigation. Get the number of bytes to allocate from the FrameInfo.
+  uint64_t StackSize = MFI.getStackSize();
+
+  // Early exit if there is no need to allocate on the stack
+  if (StackSize == 0 && !MFI.adjustsStack())
+    return;
+
+  if (!isInt<12>(StackSize)) {
+    report_fatal_error("Stack adjustment won't fit in signed 12-bit immediate");
+  }
+
+  // Allocate space on the stack if necessary.
+  if (StackSize != 0) {
+    BuildMI(MBB, MBBI, DL, TII->get(RISCV::ADDI), SPReg)
+        .addReg(SPReg)
+        .addImm(-StackSize)
+        .setMIFlag(MachineInstr::FrameSetup);
+  }
+
+  // The frame pointer is callee-saved, and code has been generated for us to
+  // save it to the stack. We need to skip over the storing of callee-saved
+  // registers as the frame pointer must be modified after it has been saved
+  // to the stack, not before.
+  // FIXME: assumes exactly one instruction is used to save each callee-saved
+  // register.
+  const std::vector<CalleeSavedInfo> &CSI = MFI.getCalleeSavedInfo();
+  std::advance(MBBI, CSI.size());
+
+  // Generate new FP.
+  BuildMI(MBB, MBBI, DL, TII->get(RISCV::ADDI), FPReg)
+      .addReg(SPReg)
+      .addImm(StackSize)
+      .setMIFlag(MachineInstr::FrameSetup);
+}
 
 void RISCVFrameLowering::emitEpilogue(MachineFunction &MF,
-                                      MachineBasicBlock &MBB) const {}
+                                      MachineBasicBlock &MBB) const {
+  if (!hasFP(MF)) {
+    report_fatal_error(
+        "emitEpilogue doesn't support framepointer-less functions");
+  }
+
+  MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
+  const RISCVInstrInfo *TII = STI.getInstrInfo();
+  const RISCVRegisterInfo *RI = STI.getRegisterInfo();
+  MachineFrameInfo &MFI = MF.getFrameInfo();
+  DebugLoc DL = MBBI->getDebugLoc();
+  unsigned FPReg = RISCV::X8;
+  unsigned SPReg = RISCV::X2;
+
+  // Skip to before the restores of callee-saved registers
+  // FIXME: assumes exactly one instruction is used to restore each
+  // callee-saved register.
+  MachineBasicBlock::iterator LastFrameDestroy = MBBI;
+  std::advance(LastFrameDestroy, -MFI.getCalleeSavedInfo().size());
+
+  uint64_t StackSize = MFI.getStackSize();
+
+  // Restore the stack pointer using the value of the frame pointer. Only
+  // necessary if the stack pointer was modified, meaning the stack size is
+  // unknown.
+  if (RI->needsStackRealignment(MF) || MFI.hasVarSizedObjects()) {
+    BuildMI(MBB, LastFrameDestroy, DL, TII->get(RISCV::ADDI), SPReg)
+        .addReg(FPReg)
+        .addImm(-StackSize)
+        .setMIFlag(MachineInstr::FrameDestroy);
+  }
+
+  if (!isInt<12>(StackSize)) {
+    report_fatal_error("Stack adjustment won't fit in signed 12-bit immediate");
+  }
+
+  // Deallocate stack
+  BuildMI(MBB, MBBI, DL, TII->get(RISCV::ADDI), SPReg)
+      .addReg(SPReg)
+      .addImm(StackSize)
+      .setMIFlag(MachineInstr::FrameDestroy);
+}
 
 int RISCVFrameLowering::getFrameIndexReference(const MachineFunction &MF,
                                                int FI,
                                                unsigned &FrameReg) const {
   const MachineFrameInfo &MFI = MF.getFrameInfo();
   const TargetRegisterInfo *RI = MF.getSubtarget().getRegisterInfo();
 
   // Callee-saved registers should be referenced relative to the stack
   // pointer (positive offset), otherwise use the frame pointer (negative
   // offset).
   const std::vector<CalleeSavedInfo> &CSI = MFI.getCalleeSavedInfo();
   int MinCSFI = 0;
   int MaxCSFI = -1;
 
   int Offset = MFI.getObjectOffset(FI) - getOffsetOfLocalArea() +
                MFI.getOffsetAdjustment();
 
   if (CSI.size()) {
     MinCSFI = CSI[0].getFrameIdx();
     MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
   }
 
   FrameReg = RI->getFrameRegister(MF);
   if (FI >= MinCSFI && FI <= MaxCSFI) {
     FrameReg = RISCV::X2;
     Offset += MF.getFrameInfo().getStackSize();
   }
   return Offset;
 }
+
+void RISCVFrameLowering::determineCalleeSaves(MachineFunction &MF,
+                                              BitVector &SavedRegs,
+                                              RegScavenger *RS) const {
+  TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
+  // TODO: Once frame pointer elimination is implemented, don't
+  // unconditionally spill the frame pointer and return address.
+  SavedRegs.set(RISCV::X1);
+  SavedRegs.set(RISCV::X8);
+}

test/CodeGen/RISCV/addc-adde-sube-subc.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 
 ; Ensure that the ISDOpcodes ADDC, ADDE, SUBC, SUBE are handled correctly
 
 define i64 @addc_adde(i64 %a, i64 %b) {
 ; RV32I-LABEL: addc_adde:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    add a1, a1, a3
 ; RV32I-NEXT:    add a2, a0, a2
 ; RV32I-NEXT:    sltu a0, a2, a0
 ; RV32I-NEXT:    add a1, a1, a0
 ; RV32I-NEXT:    addi a0, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = add i64 %a, %b
   ret i64 %1
 }
 
 define i64 @subc_sube(i64 %a, i64 %b) {
 ; RV32I-LABEL: subc_sube:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sub a1, a1, a3
 ; RV32I-NEXT:    sltu a3, a0, a2
 ; RV32I-NEXT:    sub a1, a1, a3
 ; RV32I-NEXT:    sub a0, a0, a2
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sub i64 %a, %b
   ret i64 %1
 }

test/CodeGen/RISCV/alu32.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; These tests are each targeted at a particular RISC-V ALU instruction. Other
 ; files in this folder exercise LLVM IR instructions that don't directly match a
 ; RISC-V instruction
 
 ; Register-immediate instructions
 
 define i32 @addi(i32 %a) nounwind {
 ; RV32I-LABEL: addi:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = add i32 %a, 1
   ret i32 %1
 }
 
 define i32 @slti(i32 %a) nounwind {
 ; RV32I-LABEL: slti:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slti a0, a0, 2
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp slt i32 %a, 2
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @sltiu(i32 %a) nounwind {
 ; RV32I-LABEL: sltiu:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltiu a0, a0, 3
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ult i32 %a, 3
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @xori(i32 %a) nounwind {
 ; RV32I-LABEL: xori:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    xori a0, a0, 4
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = xor i32 %a, 4
   ret i32 %1
 }
 
 define i32 @ori(i32 %a) nounwind {
 ; RV32I-LABEL: ori:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    ori a0, a0, 5
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = or i32 %a, 5
   ret i32 %1
 }
 
 define i32 @andi(i32 %a) nounwind {
 ; RV32I-LABEL: andi:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 6
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = and i32 %a, 6
   ret i32 %1
 }
 
 define i32 @slli(i32 %a) nounwind {
 ; RV32I-LABEL: slli:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a0, a0, 7
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = shl i32 %a, 7
   ret i32 %1
 }
 
 define i32 @srli(i32 %a) nounwind {
 ; RV32I-LABEL: srli:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srli a0, a0, 8
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = lshr i32 %a, 8
   ret i32 %1
 }
 
 define i32 @srai(i32 %a) nounwind {
 ; RV32I-LABEL: srai:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srai a0, a0, 9
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = ashr i32 %a, 9
   ret i32 %1
 }
 
 ; Register-register instructions
 
 define i32 @add(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: add:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    add a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = add i32 %a, %b
   ret i32 %1
 }
 
 define i32 @sub(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: sub:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sub a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sub i32 %a, %b
   ret i32 %1
 }
 
 define i32 @sll(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: sll:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sll a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = shl i32 %a, %b
   ret i32 %1
 }
 
 define i32 @slt(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: slt:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slt a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp slt i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @sltu(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: sltu:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltu a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ult i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @xor(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: xor:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    xor a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = xor i32 %a, %b
   ret i32 %1
 }
 
 define i32 @srl(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: srl:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srl a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = lshr i32 %a, %b
   ret i32 %1
 }
 
 define i32 @sra(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: sra:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sra a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = ashr i32 %a, %b
   ret i32 %1
 }
 
 define i32 @or(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: or:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    or a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = or i32 %a, %b
   ret i32 %1
 }
 
 define i32 @and(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: and:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    and a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = and i32 %a, %b
   ret i32 %1
 }

test/CodeGen/RISCV/bare-select.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i32 @bare_select(i1 %a, i32 %b, i32 %c) {
 ; RV32I-LABEL: bare_select:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    bne a0, zero, .LBB0_2
 ; RV32I-NEXT:  # BB#1:
 ; RV32I-NEXT:    addi a1, a2, 0
 ; RV32I-NEXT:  .LBB0_2:
 ; RV32I-NEXT:    addi a0, a1, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = select i1 %a, i32 %b, i32 %c
   ret i32 %1
 }

test/CodeGen/RISCV/blockaddress.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 @addr = global i8* null
 
 define void @test_blockaddress() nounwind {
 ; RV32I-LABEL: test_blockaddress:
 ; RV32I:       # BB#0:
-; RV32I-NEXT:    sw ra, 0(sp)
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a0, %hi(addr)
 ; RV32I-NEXT:    addi a0, a0, %lo(addr)
 ; RV32I-NEXT:    lui a1, %hi(.Ltmp0)
 ; RV32I-NEXT:    addi a1, a1, %lo(.Ltmp0)
 ; RV32I-NEXT:    sw a1, 0(a0)
 ; RV32I-NEXT:    lw a0, 0(a0)
 ; RV32I-NEXT:    jalr zero, a0, 0
 ; RV32I-NEXT:  .Ltmp0: # Block address taken
 ; RV32I-NEXT:  .LBB0_1: # %block
-; RV32I-NEXT:    lw ra, 0(sp)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   store volatile i8* blockaddress(@test_blockaddress, %block), i8** @addr
   %val = load volatile i8*, i8** @addr
   indirectbr i8* %val, [label %block]
 
 block:
   ret void
 }

test/CodeGen/RISCV/branch.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 
 define void @foo(i32 %a, i32 *%b, i1 %c) {
 ; RV32I-LABEL: foo:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lw a3, 0(a1)
 ; RV32I-NEXT:    beq a3, a0, .LBB0_12
 ; RV32I-NEXT:    jal zero, .LBB0_1
 ; RV32I-NEXT:  .LBB0_1: # %test2
 ; RV32I-NEXT:    lw a3, 0(a1)
 ; RV32I-NEXT:    bne a3, a0, .LBB0_12
 ; RV32I-NEXT:    jal zero, .LBB0_2
 ; RV32I-NEXT:  .LBB0_2: # %test3

 ; RV32I-NEXT:  .LBB0_10: # %test11
 ; RV32I-NEXT:    lw a0, 0(a1)
 ; RV32I-NEXT:    andi a0, a2, 1
 ; RV32I-NEXT:    bne a0, zero, .LBB0_12
 ; RV32I-NEXT:    jal zero, .LBB0_11
 ; RV32I-NEXT:  .LBB0_11: # %test12
 ; RV32I-NEXT:    lw a0, 0(a1)
 ; RV32I-NEXT:  .LBB0_12: # %end
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
 
   %val1 = load volatile i32, i32* %b
   %tst1 = icmp eq i32 %val1, %a
   br i1 %tst1, label %end, label %test2
 
 test2:
   %val2 = load volatile i32, i32* %b

test/CodeGen/RISCV/bswap-ctlz-cttz-ctpop.ll

 declare i32 @llvm.cttz.i32(i32, i1)
 declare i64 @llvm.cttz.i64(i64, i1)
 declare i32 @llvm.ctlz.i32(i32, i1)
 declare i32 @llvm.ctpop.i32(i32)
 
 define i16 @test_bswap_i16(i16 %a) nounwind {
 ; RV32I-LABEL: test_bswap_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 4080
 ; RV32I-NEXT:    addi a1, a1, 0
 ; RV32I-NEXT:    slli a2, a0, 8
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    slli a0, a0, 24
 ; RV32I-NEXT:    or a0, a0, a1
 ; RV32I-NEXT:    srli a0, a0, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i16 @llvm.bswap.i16(i16 %a)
   ret i16 %tmp
 }
 
 define i32 @test_bswap_i32(i32 %a) nounwind {
 ; RV32I-LABEL: test_bswap_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 16
 ; RV32I-NEXT:    addi a1, a1, -256
 ; RV32I-NEXT:    srli a2, a0, 8
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    srli a2, a0, 24
 ; RV32I-NEXT:    or a1, a1, a2
 ; RV32I-NEXT:    lui a2, 4080
 ; RV32I-NEXT:    addi a2, a2, 0
 ; RV32I-NEXT:    slli a3, a0, 8
 ; RV32I-NEXT:    and a2, a3, a2
 ; RV32I-NEXT:    slli a0, a0, 24
 ; RV32I-NEXT:    or a0, a0, a2
 ; RV32I-NEXT:    or a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i32 @llvm.bswap.i32(i32 %a)
   ret i32 %tmp
 }
 
 define i64 @test_bswap_i64(i64 %a) nounwind {
 ; RV32I-LABEL: test_bswap_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, 16
 ; RV32I-NEXT:    addi a3, a2, -256
 ; RV32I-NEXT:    srli a2, a1, 8
 ; RV32I-NEXT:    and a2, a2, a3
 ; RV32I-NEXT:    srli a4, a1, 24
 ; RV32I-NEXT:    or a2, a2, a4
 ; RV32I-NEXT:    lui a4, 4080
 ; RV32I-NEXT:    addi a4, a4, 0
 ; RV32I-NEXT:    slli a5, a1, 8
 ; RV32I-NEXT:    and a5, a5, a4
 ; RV32I-NEXT:    slli a1, a1, 24
 ; RV32I-NEXT:    or a1, a1, a5
 ; RV32I-NEXT:    or a2, a1, a2
 ; RV32I-NEXT:    srli a1, a0, 8
 ; RV32I-NEXT:    and a1, a1, a3
 ; RV32I-NEXT:    srli a3, a0, 24
 ; RV32I-NEXT:    or a1, a1, a3
 ; RV32I-NEXT:    slli a3, a0, 8
 ; RV32I-NEXT:    and a3, a3, a4
 ; RV32I-NEXT:    slli a0, a0, 24
 ; RV32I-NEXT:    or a0, a0, a3
 ; RV32I-NEXT:    or a1, a0, a1
 ; RV32I-NEXT:    addi a0, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i64 @llvm.bswap.i64(i64 %a)
   ret i64 %tmp
 }
 
 define i8 @test_cttz_i8(i8 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, 0
 ; RV32I-NEXT:    addi a0, zero, 8
 ; RV32I-NEXT:    andi a2, a1, 255
 ; RV32I-NEXT:    beq a2, zero, .LBB3_2
 ; RV32I-NEXT:    jal zero, .LBB3_1
 ; RV32I-NEXT:  .LBB3_1: # %cond.false
 ; RV32I-NEXT:    addi a0, a1, -1
 ; RV32I-NEXT:    xori a1, a1, -1

 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:  .LBB3_2: # %cond.end
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i8 @llvm.cttz.i8(i8 %a, i1 false)
   ret i8 %tmp
 }
 
 define i16 @test_cttz_i16(i16 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, 0
 ; RV32I-NEXT:    addi a0, zero, 16
 ; RV32I-NEXT:    lui a2, 16
 ; RV32I-NEXT:    addi a2, a2, -1
 ; RV32I-NEXT:    and a2, a1, a2
 ; RV32I-NEXT:    beq a2, zero, .LBB4_2
 ; RV32I-NEXT:    jal zero, .LBB4_1
 ; RV32I-NEXT:  .LBB4_1: # %cond.false

 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:  .LBB4_2: # %cond.end
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i16 @llvm.cttz.i16(i16 %a, i1 false)
   ret i16 %tmp
 }
 
 define i32 @test_cttz_i32(i32 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, 0
 ; RV32I-NEXT:    addi a0, zero, 32
 ; RV32I-NEXT:    beq a1, zero, .LBB5_2
 ; RV32I-NEXT:    jal zero, .LBB5_1
 ; RV32I-NEXT:  .LBB5_1: # %cond.false
 ; RV32I-NEXT:    addi a0, a1, -1
 ; RV32I-NEXT:    xori a1, a1, -1
 ; RV32I-NEXT:    and a0, a1, a0

 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:  .LBB5_2: # %cond.end
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i32 @llvm.cttz.i32(i32 %a, i1 false)
   ret i32 %tmp
 }
 
 define i32 @test_ctlz_i32(i32 %a) nounwind {
 ; RV32I-LABEL: test_ctlz_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, 0
 ; RV32I-NEXT:    addi a0, zero, 32
 ; RV32I-NEXT:    beq a1, zero, .LBB6_2
 ; RV32I-NEXT:    jal zero, .LBB6_1
 ; RV32I-NEXT:  .LBB6_1: # %cond.false
 ; RV32I-NEXT:    srli a0, a1, 1
 ; RV32I-NEXT:    or a0, a1, a0
 ; RV32I-NEXT:    srli a1, a0, 2

 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:  .LBB6_2: # %cond.end
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i32 @llvm.ctlz.i32(i32 %a, i1 false)
   ret i32 %tmp
 }
 
 define i64 @test_cttz_i64(i64 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i64:
 ; RV32I:       # BB#0:
-; RV32I-NEXT:    sw ra, 28(sp)
-; RV32I-NEXT:    sw s1, 24(sp)
-; RV32I-NEXT:    sw s2, 20(sp)
-; RV32I-NEXT:    sw s3, 16(sp)
-; RV32I-NEXT:    sw s4, 12(sp)
-; RV32I-NEXT:    sw s5, 8(sp)
-; RV32I-NEXT:    sw s6, 4(sp)
-; RV32I-NEXT:    sw s7, 0(sp)
+; RV32I-NEXT:    addi sp, sp, -48
+; RV32I-NEXT:    sw ra, 44(sp)
+; RV32I-NEXT:    sw s0, 40(sp)
+; RV32I-NEXT:    sw s1, 36(sp)
+; RV32I-NEXT:    sw s2, 32(sp)
+; RV32I-NEXT:    sw s3, 28(sp)
+; RV32I-NEXT:    sw s4, 24(sp)
+; RV32I-NEXT:    sw s5, 20(sp)
+; RV32I-NEXT:    sw s6, 16(sp)
+; RV32I-NEXT:    sw s7, 12(sp)
+; RV32I-NEXT:    addi s0, sp, 48
 ; RV32I-NEXT:    addi s1, a1, 0
 ; RV32I-NEXT:    addi s2, a0, 0
 ; RV32I-NEXT:    addi a0, s2, -1
 ; RV32I-NEXT:    xori a1, s2, -1
 ; RV32I-NEXT:    and a0, a1, a0
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi s4, a1, 1365
 ; RV32I-NEXT:    srli a1, a0, 1

 ; RV32I-NEXT:    jalr ra, s6, 0
 ; RV32I-NEXT:    bne s2, zero, .LBB7_2
 ; RV32I-NEXT:  # BB#1:
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:    addi s1, a0, 32
 ; RV32I-NEXT:  .LBB7_2:
 ; RV32I-NEXT:    addi a0, s1, 0
 ; RV32I-NEXT:    addi a1, zero, 0
-; RV32I-NEXT:    lw s7, 0(sp)
-; RV32I-NEXT:    lw s6, 4(sp)
-; RV32I-NEXT:    lw s5, 8(sp)
-; RV32I-NEXT:    lw s4, 12(sp)
-; RV32I-NEXT:    lw s3, 16(sp)
-; RV32I-NEXT:    lw s2, 20(sp)
-; RV32I-NEXT:    lw s1, 24(sp)
-; RV32I-NEXT:    lw ra, 28(sp)
+; RV32I-NEXT:    lw s7, 12(sp)
+; RV32I-NEXT:    lw s6, 16(sp)
+; RV32I-NEXT:    lw s5, 20(sp)
+; RV32I-NEXT:    lw s4, 24(sp)
+; RV32I-NEXT:    lw s3, 28(sp)
+; RV32I-NEXT:    lw s2, 32(sp)
+; RV32I-NEXT:    lw s1, 36(sp)
+; RV32I-NEXT:    lw s0, 40(sp)
+; RV32I-NEXT:    lw ra, 44(sp)
+; RV32I-NEXT:    addi sp, sp, 48
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i64 @llvm.cttz.i64(i64 %a, i1 false)
   ret i64 %tmp
 }
 
 define i8 @test_cttz_i8_zero_undef(i8 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i8_zero_undef:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, -1
 ; RV32I-NEXT:    xori a0, a0, -1
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi a1, a1, 1365
 ; RV32I-NEXT:    srli a2, a0, 1
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    sub a0, a0, a1

 ; RV32I-NEXT:    addi a1, a1, -241
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i8 @llvm.cttz.i8(i8 %a, i1 true)
   ret i8 %tmp
 }
 
 define i16 @test_cttz_i16_zero_undef(i16 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i16_zero_undef:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, -1
 ; RV32I-NEXT:    xori a0, a0, -1
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi a1, a1, 1365
 ; RV32I-NEXT:    srli a2, a0, 1
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    sub a0, a0, a1

 ; RV32I-NEXT:    addi a1, a1, -241
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i16 @llvm.cttz.i16(i16 %a, i1 true)
   ret i16 %tmp
 }
 
 define i32 @test_cttz_i32_zero_undef(i32 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i32_zero_undef:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, a0, -1
 ; RV32I-NEXT:    xori a0, a0, -1
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi a1, a1, 1365
 ; RV32I-NEXT:    srli a2, a0, 1
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    sub a0, a0, a1

 ; RV32I-NEXT:    addi a1, a1, -241
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i32 @llvm.cttz.i32(i32 %a, i1 true)
   ret i32 %tmp
 }
 
 define i64 @test_cttz_i64_zero_undef(i64 %a) nounwind {
 ; RV32I-LABEL: test_cttz_i64_zero_undef:
 ; RV32I:       # BB#0:
-; RV32I-NEXT:    sw ra, 28(sp)
-; RV32I-NEXT:    sw s1, 24(sp)
-; RV32I-NEXT:    sw s2, 20(sp)
-; RV32I-NEXT:    sw s3, 16(sp)
-; RV32I-NEXT:    sw s4, 12(sp)
-; RV32I-NEXT:    sw s5, 8(sp)
-; RV32I-NEXT:    sw s6, 4(sp)
-; RV32I-NEXT:    sw s7, 0(sp)
+; RV32I-NEXT:    addi sp, sp, -48
+; RV32I-NEXT:    sw ra, 44(sp)
+; RV32I-NEXT:    sw s0, 40(sp)
+; RV32I-NEXT:    sw s1, 36(sp)
+; RV32I-NEXT:    sw s2, 32(sp)
+; RV32I-NEXT:    sw s3, 28(sp)
+; RV32I-NEXT:    sw s4, 24(sp)
+; RV32I-NEXT:    sw s5, 20(sp)
+; RV32I-NEXT:    sw s6, 16(sp)
+; RV32I-NEXT:    sw s7, 12(sp)
+; RV32I-NEXT:    addi s0, sp, 48
 ; RV32I-NEXT:    addi s1, a1, 0
 ; RV32I-NEXT:    addi s2, a0, 0
 ; RV32I-NEXT:    addi a0, s2, -1
 ; RV32I-NEXT:    xori a1, s2, -1
 ; RV32I-NEXT:    and a0, a1, a0
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi s4, a1, 1365
 ; RV32I-NEXT:    srli a1, a0, 1

 ; RV32I-NEXT:    jalr ra, s6, 0
 ; RV32I-NEXT:    bne s2, zero, .LBB11_2
 ; RV32I-NEXT:  # BB#1:
 ; RV32I-NEXT:    srli a0, a0, 24
 ; RV32I-NEXT:    addi s1, a0, 32
 ; RV32I-NEXT:  .LBB11_2:
 ; RV32I-NEXT:    addi a0, s1, 0
 ; RV32I-NEXT:    addi a1, zero, 0
-; RV32I-NEXT:    lw s7, 0(sp)
-; RV32I-NEXT:    lw s6, 4(sp)
-; RV32I-NEXT:    lw s5, 8(sp)
-; RV32I-NEXT:    lw s4, 12(sp)
-; RV32I-NEXT:    lw s3, 16(sp)
-; RV32I-NEXT:    lw s2, 20(sp)
-; RV32I-NEXT:    lw s1, 24(sp)
-; RV32I-NEXT:    lw ra, 28(sp)
+; RV32I-NEXT:    lw s7, 12(sp)
+; RV32I-NEXT:    lw s6, 16(sp)
+; RV32I-NEXT:    lw s5, 20(sp)
+; RV32I-NEXT:    lw s4, 24(sp)
+; RV32I-NEXT:    lw s3, 28(sp)
+; RV32I-NEXT:    lw s2, 32(sp)
+; RV32I-NEXT:    lw s1, 36(sp)
+; RV32I-NEXT:    lw s0, 40(sp)
+; RV32I-NEXT:    lw ra, 44(sp)
+; RV32I-NEXT:    addi sp, sp, 48
 ; RV32I-NEXT:    jalr zero, ra, 0
   %tmp = call i64 @llvm.cttz.i64(i64 %a, i1 true)
   ret i64 %tmp
 }
 
 define i32 @test_ctpop_i32(i32 %a) nounwind {
 ; RV32I-LABEL: test_ctpop_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 349525
 ; RV32I-NEXT:    addi a1, a1, 1365
 ; RV32I-NEXT:    srli a2, a0, 1
 ; RV32I-NEXT:    and a1, a2, a1
 ; RV32I-NEXT:    sub a0, a0, a1
 ; RV32I-NEXT:    lui a1, 209715
 ; RV32I-NEXT:    addi a1, a1, 819
 ; RV32I-NEXT:    and a2, a0, a1
 ; RV32I-NEXT:    srli a0, a0, 2
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    add a0, a2, a0
 ; RV32I-NEXT:    srli a1, a0, 4
 ; RV32I-NEXT:    add a0, a0, a1
 ; RV32I-NEXT:    lui a1, 61681
 ; RV32I-NEXT:    addi a1, a1, -241
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    lui a1, 4112
 ; RV32I-NEXT:    addi a1, a1, 257
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    srli a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = call i32 @llvm.ctpop.i32(i32 %a)
   ret i32 %1
 }

test/CodeGen/RISCV/calls.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 
 declare i32 @external_function(i32)
 
 define i32 @test_call_external(i32 %a) nounwind {
 ; RV32I-LABEL: test_call_external:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(external_function)
 ; RV32I-NEXT:    addi a1, a1, %lo(external_function)
 ; RV32I-NEXT:    jalr ra, a1, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = call i32 @external_function(i32 %a)
   ret i32 %1
 }
 
 define i32 @defined_function(i32 %a) nounwind {
 ; RV32I-LABEL: defined_function:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = add i32 %a, 1
   ret i32 %1
 }
 
 define i32 @test_call_defined(i32 %a) nounwind {
 ; RV32I-LABEL: test_call_defined:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(defined_function)
 ; RV32I-NEXT:    addi a1, a1, %lo(defined_function)
 ; RV32I-NEXT:    jalr ra, a1, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = call i32 @defined_function(i32 %a) nounwind
   ret i32 %1
 }
 
 define i32 @test_call_indirect(i32 (i32)* %a, i32 %b) nounwind {
 ; RV32I-LABEL: test_call_indirect:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a2, a0, 0
 ; RV32I-NEXT:    addi a0, a1, 0
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = call i32 %a(i32 %b)
   ret i32 %1
 }
 
 ; Ensure that calls to fastcc functions aren't rejected. Such calls may be
 ; introduced when compiling with optimisation.
 
 define fastcc i32 @fastcc_function(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: fastcc_function:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    add a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
  %1 = add i32 %a, %b
  ret i32 %1
 }
 
 define i32 @test_call_fastcc(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: test_call_fastcc:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
-; RV32I-NEXT:    sw s1, 8(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    sw s1, 4(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi s1, a0, 0
 ; RV32I-NEXT:    lui a0, %hi(fastcc_function)
 ; RV32I-NEXT:    addi a2, a0, %lo(fastcc_function)
 ; RV32I-NEXT:    addi a0, s1, 0
 ; RV32I-NEXT:    jalr ra, a2, 0
 ; RV32I-NEXT:    addi a0, s1, 0
-; RV32I-NEXT:    lw s1, 8(sp)
+; RV32I-NEXT:    lw s1, 4(sp)
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = call fastcc i32 @fastcc_function(i32 %a, i32 %b)
   ret i32 %a
 }

test/CodeGen/RISCV/div.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i32 @udiv(i32 %a, i32 %b) {
 ; RV32I-LABEL: udiv:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__udivsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__udivsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = udiv i32 %a, %b
   ret i32 %1
 }
 
 define i32 @udiv_constant(i32 %a) {
 ; RV32I-LABEL: udiv_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(__udivsi3)
 ; RV32I-NEXT:    addi a2, a1, %lo(__udivsi3)
 ; RV32I-NEXT:    addi a1, zero, 5
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = udiv i32 %a, 5
   ret i32 %1
 }
 
 define i32 @udiv_pow2(i32 %a) {
 ; RV32I-LABEL: udiv_pow2:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srli a0, a0, 3
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = udiv i32 %a, 8
   ret i32 %1
 }
 
 define i64 @udiv64(i64 %a, i64 %b) {
 ; RV32I-LABEL: udiv64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a4, %hi(__udivdi3)
 ; RV32I-NEXT:    addi a4, a4, %lo(__udivdi3)
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = udiv i64 %a, %b
   ret i64 %1
 }
 
 define i64 @udiv64_constant(i64 %a) {
 ; RV32I-LABEL: udiv64_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__udivdi3)
 ; RV32I-NEXT:    addi a4, a2, %lo(__udivdi3)
 ; RV32I-NEXT:    addi a2, zero, 5
 ; RV32I-NEXT:    addi a3, zero, 0
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = udiv i64 %a, 5
   ret i64 %1
 }
 
 define i32 @sdiv(i32 %a, i32 %b) {
 ; RV32I-LABEL: sdiv:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__divsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__divsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sdiv i32 %a, %b
   ret i32 %1
 }
 
 define i32 @sdiv_constant(i32 %a) {
 ; RV32I-LABEL: sdiv_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(__divsi3)
 ; RV32I-NEXT:    addi a2, a1, %lo(__divsi3)
 ; RV32I-NEXT:    addi a1, zero, 5
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sdiv i32 %a, 5
   ret i32 %1
 }
 
 define i32 @sdiv_pow2(i32 %a) {
 ; RV32I-LABEL: sdiv_pow2:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srai a1, a0, 31
 ; RV32I-NEXT:    srli a1, a1, 29
 ; RV32I-NEXT:    add a0, a0, a1
 ; RV32I-NEXT:    srai a0, a0, 3
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sdiv i32 %a, 8
   ret i32 %1
 }
 
 define i64 @sdiv64(i64 %a, i64 %b) {
 ; RV32I-LABEL: sdiv64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a4, %hi(__divdi3)
 ; RV32I-NEXT:    addi a4, a4, %lo(__divdi3)
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sdiv i64 %a, %b
   ret i64 %1
 }
 
 define i64 @sdiv64_constant(i64 %a) {
 ; RV32I-LABEL: sdiv64_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__divdi3)
 ; RV32I-NEXT:    addi a4, a2, %lo(__divdi3)
 ; RV32I-NEXT:    addi a2, zero, 5
 ; RV32I-NEXT:    addi a3, zero, 0
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sdiv i64 %a, 5
   ret i64 %1
 }

test/CodeGen/RISCV/frame.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 
 %struct.key_t = type { i32, [16 x i8] }
 
-; FIXME: prologue and epilogue insertion must be implemented to complete this
-; test
-
 define i32 @test() nounwind {
 ; RV32I-LABEL: test:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -32
 ; RV32I-NEXT:    sw ra, 28(sp)
-; RV32I-NEXT:    sw zero, -8(s0)
-; RV32I-NEXT:    sw zero, -12(s0)
+; RV32I-NEXT:    sw s0, 24(sp)
+; RV32I-NEXT:    addi s0, sp, 32
 ; RV32I-NEXT:    sw zero, -16(s0)
 ; RV32I-NEXT:    sw zero, -20(s0)
 ; RV32I-NEXT:    sw zero, -24(s0)
-; RV32I-NEXT:    addi a0, s0, -24
+; RV32I-NEXT:    sw zero, -28(s0)
+; RV32I-NEXT:    sw zero, -32(s0)
+; RV32I-NEXT:    addi a0, s0, -32
 ; RV32I-NEXT:    ori a0, a0, 4
 ; RV32I-NEXT:    lui a1, %hi(test1)
 ; RV32I-NEXT:    addi a1, a1, %lo(test1)
 ; RV32I-NEXT:    jalr ra, a1, 0
 ; RV32I-NEXT:    addi a0, zero, 0
+; RV32I-NEXT:    lw s0, 24(sp)
 ; RV32I-NEXT:    lw ra, 28(sp)
+; RV32I-NEXT:    addi sp, sp, 32
 ; RV32I-NEXT:    jalr zero, ra, 0
   %key = alloca %struct.key_t, align 4
   %1 = bitcast %struct.key_t* %key to i8*
   call void @llvm.memset.p0i8.i64(i8* %1, i8 0, i64 20, i32 4, i1 false)
   %2 = getelementptr inbounds %struct.key_t, %struct.key_t* %key, i64 0, i32 1, i64 0
   call void @test1(i8* %2) #3
   ret i32 0
 }
 
 declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
 
 declare void @test1(i8*)

test/CodeGen/RISCV/i32-icmp.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; TODO: check the generated instructions for the equivalent of seqz, snez,
 ; sltz, sgtz map to something simple
 
 define i32 @icmp_eq(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_eq:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    xor a0, a0, a1
 ; RV32I-NEXT:    sltiu a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp eq i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_ne(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_ne:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    xor a0, a0, a1
 ; RV32I-NEXT:    sltu a0, zero, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ne i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_ugt(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_ugt:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltu a0, a1, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ugt i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_uge(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_uge:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltu a0, a0, a1
 ; RV32I-NEXT:    xori a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp uge i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_ult(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_ult:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltu a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ult i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_ule(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_ule:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sltu a0, a1, a0
 ; RV32I-NEXT:    xori a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp ule i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_sgt(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_sgt:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slt a0, a1, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp sgt i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_sge(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_sge:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slt a0, a0, a1
 ; RV32I-NEXT:    xori a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp sge i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_slt(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_slt:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slt a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp slt i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 define i32 @icmp_sle(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: icmp_sle:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slt a0, a1, a0
 ; RV32I-NEXT:    xori a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = icmp sle i32 %a, %b
   %2 = zext i1 %1 to i32
   ret i32 %2
 }
 
 ; TODO: check variants with an immediate?

test/CodeGen/RISCV/imm.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; Materializing constants
 
 define i32 @zero() nounwind {
 ; RV32I-LABEL: zero:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a0, zero, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ret i32 0
 }
 
 define i32 @pos_small() nounwind {
 ; RV32I-LABEL: pos_small:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a0, zero, 2047
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ret i32 2047
 }
 
 define i32 @neg_small() nounwind {
 ; RV32I-LABEL: neg_small:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a0, zero, -2048
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ret i32 -2048
 }
 
 define i32 @pos_i32() nounwind {
 ; RV32I-LABEL: pos_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a0, 423811
 ; RV32I-NEXT:    addi a0, a0, -1297
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ret i32 1735928559
 }
 
 define i32 @neg_i32() nounwind {
 ; RV32I-LABEL: neg_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a0, 912092
 ; RV32I-NEXT:    addi a0, a0, -273
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ret i32 -559038737
 }

test/CodeGen/RISCV/indirectbr.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i32 @indirectbr(i8* %target) nounwind {
 ; RV32I-LABEL: indirectbr:
 ; RV32I:       # BB#0:
-; RV32I-NEXT:    sw ra, 0(sp)
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    jalr zero, a0, 0
 ; RV32I-NEXT:  .LBB0_1: # %ret
 ; RV32I-NEXT:    addi a0, zero, 0
-; RV32I-NEXT:    lw ra, 0(sp)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   indirectbr i8* %target, [label %test_label]
 test_label:
   br label %ret
 ret:
   ret i32 0
 }
 
 define i32 @indirectbr_with_offset(i8* %a) nounwind {
 ; RV32I-LABEL: indirectbr_with_offset:
 ; RV32I:       # BB#0:
-; RV32I-NEXT:    sw ra, 0(sp)
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    jalr zero, a0, 1380
 ; RV32I-NEXT:  .LBB1_1: # %ret
 ; RV32I-NEXT:    addi a0, zero, 0
-; RV32I-NEXT:    lw ra, 0(sp)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %target = getelementptr inbounds i8, i8* %a, i32 1380
   indirectbr i8* %target, [label %test_label]
 test_label:
   br label %ret
 ret:
   ret i32 0
 }

test/CodeGen/RISCV/jumptable.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define void @jt(i32 %in, i32* %out) {
 ; RV32I-LABEL: jt:
 ; RV32I:       # BB#0: # %entry
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a2, zero, 2
 ; RV32I-NEXT:    blt a2, a0, .LBB0_3
 ; RV32I-NEXT:    jal zero, .LBB0_1
 ; RV32I-NEXT:  .LBB0_1: # %entry
 ; RV32I-NEXT:    addi a3, zero, 1
 ; RV32I-NEXT:    beq a0, a3, .LBB0_5
 ; RV32I-NEXT:    jal zero, .LBB0_2
 ; RV32I-NEXT:  .LBB0_2: # %entry

 ; RV32I-NEXT:  .LBB0_4: # %entry
 ; RV32I-NEXT:    addi a2, zero, 4
 ; RV32I-NEXT:    beq a0, a2, .LBB0_8
 ; RV32I-NEXT:    jal zero, .LBB0_9
 ; RV32I-NEXT:  .LBB0_8: # %bb4
 ; RV32I-NEXT:    addi a0, zero, 1
 ; RV32I-NEXT:    sw a0, 0(a1)
 ; RV32I-NEXT:  .LBB0_9: # %exit
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
 ; RV32I-NEXT:  .LBB0_5: # %bb1
 ; RV32I-NEXT:    addi a0, zero, 4
 ; RV32I-NEXT:    sw a0, 0(a1)
 ; RV32I-NEXT:    jal zero, .LBB0_9
 ; RV32I-NEXT:  .LBB0_7: # %bb3
 ; RV32I-NEXT:    sw a2, 0(a1)
 ; RV32I-NEXT:    jal zero, .LBB0_9

test/CodeGen/RISCV/mem.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; Check indexed and unindexed, sext, zext and anyext loads
 
 define i32 @lb(i8 *%a) nounwind {
 ; RV32I-LABEL: lb:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lb a1, 0(a0)
 ; RV32I-NEXT:    lb a0, 1(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = getelementptr i8, i8* %a, i32 1
   %2 = load i8, i8* %1
   %3 = sext i8 %2 to i32
   ; the unused load will produce an anyext for selection
   %4 = load volatile i8, i8* %a
   ret i32 %3
 }
 
 define i32 @lh(i16 *%a) nounwind {
 ; RV32I-LABEL: lh:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lh a1, 0(a0)
 ; RV32I-NEXT:    lh a0, 4(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = getelementptr i16, i16* %a, i32 2
   %2 = load i16, i16* %1
   %3 = sext i16 %2 to i32
   ; the unused load will produce an anyext for selection
   %4 = load volatile i16, i16* %a
   ret i32 %3
 }
 
 define i32 @lw(i32 *%a) nounwind {
 ; RV32I-LABEL: lw:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lw a1, 0(a0)
 ; RV32I-NEXT:    lw a0, 12(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = getelementptr i32, i32* %a, i32 3
   %2 = load i32, i32* %1
   %3 = load volatile i32, i32* %a
   ret i32 %2
 }
 
 define i32 @lbu(i8 *%a) nounwind {
 ; RV32I-LABEL: lbu:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lbu a1, 0(a0)
 ; RV32I-NEXT:    lbu a0, 4(a0)
 ; RV32I-NEXT:    add a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = getelementptr i8, i8* %a, i32 4
   %2 = load i8, i8* %1
   %3 = zext i8 %2 to i32
   %4 = load volatile i8, i8* %a
   %5 = zext i8 %4 to i32
   %6 = add i32 %3, %5
   ret i32 %6
 }
 
 define i32 @lhu(i16 *%a) nounwind {
 ; RV32I-LABEL: lhu:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lhu a1, 0(a0)
 ; RV32I-NEXT:    lhu a0, 10(a0)
 ; RV32I-NEXT:    add a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = getelementptr i16, i16* %a, i32 5
   %2 = load i16, i16* %1
   %3 = zext i16 %2 to i32
   %4 = load volatile i16, i16* %a
   %5 = zext i16 %4 to i32
   %6 = add i32 %3, %5
   ret i32 %6
 }
 
 ; Check indexed and unindexed stores
 
 define void @sb(i8 *%a, i8 %b) nounwind {
 ; RV32I-LABEL: sb:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sb a1, 6(a0)
 ; RV32I-NEXT:    sb a1, 0(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   store i8 %b, i8* %a
   %1 = getelementptr i8, i8* %a, i32 6
   store i8 %b, i8* %1
   ret void
 }
 
 define void @sh(i16 *%a, i16 %b) nounwind {
 ; RV32I-LABEL: sh:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sh a1, 14(a0)
 ; RV32I-NEXT:    sh a1, 0(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   store i16 %b, i16* %a
   %1 = getelementptr i16, i16* %a, i32 7
   store i16 %b, i16* %1
   ret void
 }
 
 define void @sw(i32 *%a, i32 %b) nounwind {
 ; RV32I-LABEL: sw:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    sw a1, 32(a0)
 ; RV32I-NEXT:    sw a1, 0(a0)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   store i32 %b, i32* %a
   %1 = getelementptr i32, i32* %a, i32 8
   store i32 %b, i32* %1
   ret void
 }
 
 ; Check load and store to an i1 location
 define i32 @load_sext_zext_anyext_i1(i1 *%a) nounwind {
 ; RV32I-LABEL: load_sext_zext_anyext_i1:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lb a1, 0(a0)
 ; RV32I-NEXT:    lbu a1, 1(a0)
 ; RV32I-NEXT:    lbu a0, 2(a0)
 ; RV32I-NEXT:    sub a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ; sextload i1
   %1 = getelementptr i1, i1* %a, i32 1
   %2 = load i1, i1* %1
   %3 = sext i1 %2 to i32
   ; zextload i1
   %4 = getelementptr i1, i1* %a, i32 2
   %5 = load i1, i1* %4
   %6 = zext i1 %5 to i32
   %7 = add i32 %3, %6
   ; extload i1 (anyext). Produced as the load is unused.
   %8 = load volatile i1, i1* %a
   ret i32 %7
 }
 
 define i16 @load_sext_zext_anyext_i1_i16(i1 *%a) nounwind {
 ; RV32I-LABEL: load_sext_zext_anyext_i1_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lb a1, 0(a0)
 ; RV32I-NEXT:    lbu a1, 1(a0)
 ; RV32I-NEXT:    lbu a0, 2(a0)
 ; RV32I-NEXT:    sub a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   ; sextload i1
   %1 = getelementptr i1, i1* %a, i32 1
   %2 = load i1, i1* %1
   %3 = sext i1 %2 to i16
   ; zextload i1
   %4 = getelementptr i1, i1* %a, i32 2
   %5 = load i1, i1* %4
   %6 = zext i1 %5 to i16
   %7 = add i16 %3, %6
   ; extload i1 (anyext). Produced as the load is unused.
   %8 = load volatile i1, i1* %a
   ret i16 %7
 }
 
 ; Check load and store to a global
 @G = global i32 0
 
 define i32 @lw_sw_global(i32 %a) nounwind {
 ; TODO: the addi should be folded in to the lw/sw operations
 ; RV32I-LABEL: lw_sw_global:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(G)
 ; RV32I-NEXT:    addi a2, a1, %lo(G)
 ; RV32I-NEXT:    lw a1, 0(a2)
 ; RV32I-NEXT:    sw a0, 0(a2)
 ; RV32I-NEXT:    lui a2, %hi(G+36)
 ; RV32I-NEXT:    addi a2, a2, %lo(G+36)
 ; RV32I-NEXT:    lw a3, 0(a2)
 ; RV32I-NEXT:    sw a0, 0(a2)
 ; RV32I-NEXT:    addi a0, a1, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = load volatile i32, i32* @G
   store i32 %a, i32* @G
   %2 = getelementptr i32, i32* @G, i32 9
   %3 = load volatile i32, i32* %2
   store i32 %a, i32* %2
   ret i32 %1
 }
 
 ; Ensure that 1 is added to the high 20 bits if bit 11 of the low part is 1
 define i32 @lw_sw_constant(i32 %a) nounwind {
 ; TODO: the addi should be folded in to the lw/sw
 ; RV32I-LABEL: lw_sw_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 912092
 ; RV32I-NEXT:    addi a2, a1, -273
 ; RV32I-NEXT:    lw a1, 0(a2)
 ; RV32I-NEXT:    sw a0, 0(a2)
 ; RV32I-NEXT:    addi a0, a1, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = inttoptr i32 3735928559 to i32*
   %2 = load volatile i32, i32* %1
   store i32 %a, i32* %1
   ret i32 %2
 }

test/CodeGen/RISCV/mul.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i32 @square(i32 %a) {
 ; RV32I-LABEL: square:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a1, %lo(__mulsi3)
 ; RV32I-NEXT:    addi a1, a0, 0
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i32 %a, %a
   ret i32 %1
 }
 
 define i32 @mul(i32 %a, i32 %b) {
 ; RV32I-LABEL: mul:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__mulsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i32 %a, %b
   ret i32 %1
 }
 
 define i32 @mul_constant(i32 %a) {
 ; RV32I-LABEL: mul_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, %hi(__mulsi3)
 ; RV32I-NEXT:    addi a2, a1, %lo(__mulsi3)
 ; RV32I-NEXT:    addi a1, zero, 5
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i32 %a, 5
   ret i32 %1
 }
 
 define i32 @mul_pow2(i32 %a) {
 ; RV32I-LABEL: mul_pow2:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a0, a0, 3
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i32 %a, 8
   ret i32 %1
 }
 
 define i64 @mul64(i64 %a, i64 %b) {
 ; RV32I-LABEL: mul64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a4, %hi(__muldi3)
 ; RV32I-NEXT:    addi a4, a4, %lo(__muldi3)
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i64 %a, %b
   ret i64 %1
 }
 
 define i64 @mul64_constant(i64 %a) {
 ; RV32I-LABEL: mul64_constant:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__muldi3)
 ; RV32I-NEXT:    addi a4, a2, %lo(__muldi3)
 ; RV32I-NEXT:    addi a2, zero, 5
 ; RV32I-NEXT:    addi a3, zero, 0
 ; RV32I-NEXT:    jalr ra, a4, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = mul i64 %a, 5
   ret i64 %1
 }

test/CodeGen/RISCV/rem.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i32 @urem(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: urem:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__umodsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__umodsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = urem i32 %a, %b
   ret i32 %1
 }
 
 define i32 @srem(i32 %a, i32 %b) nounwind {
 ; RV32I-LABEL: srem:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a2, %hi(__modsi3)
 ; RV32I-NEXT:    addi a2, a2, %lo(__modsi3)
 ; RV32I-NEXT:    jalr ra, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = srem i32 %a, %b
   ret i32 %1
 }

test/CodeGen/RISCV/rotl-rotr.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; These IR sequences will generate ISD::ROTL and ISD::ROTR nodes, that the
 ; RISC-V backend must be able to select
 
 define i32 @rotl(i32 %x, i32 %y) {
 ; RV32I-LABEL: rotl:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a2, zero, 32
 ; RV32I-NEXT:    sub a2, a2, a1
 ; RV32I-NEXT:    sll a1, a0, a1
 ; RV32I-NEXT:    srl a0, a0, a2
 ; RV32I-NEXT:    or a0, a1, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %z = sub i32 32, %y
   %b = shl i32 %x, %y
   %c = lshr i32 %x, %z
   %d = or i32 %b, %c
   ret i32 %d
 }
 
 define i32 @rotr(i32 %x, i32 %y) {
 ; RV32I-LABEL: rotr:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a2, zero, 32
 ; RV32I-NEXT:    sub a2, a2, a1
 ; RV32I-NEXT:    srl a1, a0, a1
 ; RV32I-NEXT:    sll a0, a0, a2
 ; RV32I-NEXT:    or a0, a1, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %z = sub i32 32, %y
   %b = lshr i32 %x, %y
   %c = shl i32 %x, %z
   %d = or i32 %b, %c
   ret i32 %d
 }

test/CodeGen/RISCV/select-cc.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 
 define i32 @foo(i32 %a, i32 *%b) {
 ; RV32I-LABEL: foo:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lw a2, 0(a1)
 ; RV32I-NEXT:    beq a0, a2, .LBB0_2
 ; RV32I-NEXT:  # BB#1:
 ; RV32I-NEXT:    addi a0, a2, 0
 ; RV32I-NEXT:  .LBB0_2:
 ; RV32I-NEXT:    lw a2, 0(a1)
 ; RV32I-NEXT:    bne a0, a2, .LBB0_4
 ; RV32I-NEXT:  # BB#3:

 ; RV32I-NEXT:  # BB#17:
 ; RV32I-NEXT:    addi a0, a2, 0
 ; RV32I-NEXT:  .LBB0_18:
 ; RV32I-NEXT:    lw a1, 0(a1)
 ; RV32I-NEXT:    bge a1, a0, .LBB0_20
 ; RV32I-NEXT:  # BB#19:
 ; RV32I-NEXT:    addi a0, a1, 0
 ; RV32I-NEXT:  .LBB0_20:
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %val1 = load volatile i32, i32* %b
   %tst1 = icmp eq i32 %a, %val1
   %val2 = select i1 %tst1, i32 %a, i32 %val1
 
   %val3 = load volatile i32, i32* %b
   %tst2 = icmp ne i32 %val2, %val3
   %val4 = select i1 %tst2, i32 %val2, i32 %val3

test/CodeGen/RISCV/sext-zext-trunc.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 define i8 @sext_i1_to_i8(i1 %a) {
 ; RV32I-LABEL: sext_i1_to_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    sub a0, zero, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i1 %a to i8
   ret i8 %1
 }
 
 define i16 @sext_i1_to_i16(i1 %a) {
 ; RV32I-LABEL: sext_i1_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    sub a0, zero, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i1 %a to i16
   ret i16 %1
 }
 
 define i32 @sext_i1_to_i32(i1 %a) {
 ; RV32I-LABEL: sext_i1_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    sub a0, zero, a0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i1 %a to i32
   ret i32 %1
 }
 
 define i64 @sext_i1_to_i64(i1 %a) {
 ; RV32I-LABEL: sext_i1_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    sub a0, zero, a0
 ; RV32I-NEXT:    addi a1, a0, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i1 %a to i64
   ret i64 %1
 }
 
 define i16 @sext_i8_to_i16(i8 %a) {
 ; RV32I-LABEL: sext_i8_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a0, a0, 24
 ; RV32I-NEXT:    srai a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i8 %a to i16
   ret i16 %1
 }
 
 define i32 @sext_i8_to_i32(i8 %a) {
 ; RV32I-LABEL: sext_i8_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a0, a0, 24
 ; RV32I-NEXT:    srai a0, a0, 24
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i8 %a to i32
   ret i32 %1
 }
 
 define i64 @sext_i8_to_i64(i8 %a) {
 ; RV32I-LABEL: sext_i8_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a1, a0, 24
 ; RV32I-NEXT:    srai a0, a1, 24
 ; RV32I-NEXT:    srai a1, a1, 31
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i8 %a to i64
   ret i64 %1
 }
 
 define i32 @sext_i16_to_i32(i16 %a) {
 ; RV32I-LABEL: sext_i16_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a0, a0, 16
 ; RV32I-NEXT:    srai a0, a0, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i16 %a to i32
   ret i32 %1
 }
 
 define i64 @sext_i16_to_i64(i16 %a) {
 ; RV32I-LABEL: sext_i16_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    slli a1, a0, 16
 ; RV32I-NEXT:    srai a0, a1, 16
 ; RV32I-NEXT:    srai a1, a1, 31
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i16 %a to i64
   ret i64 %1
 }
 
 define i64 @sext_i32_to_i64(i32 %a) {
 ; RV32I-LABEL: sext_i32_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    srai a1, a0, 31
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = sext i32 %a to i64
   ret i64 %1
 }
 
 define i8 @zext_i1_to_i8(i1 %a) {
 ; RV32I-LABEL: zext_i1_to_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i1 %a to i8
   ret i8 %1
 }
 
 define i16 @zext_i1_to_i16(i1 %a) {
 ; RV32I-LABEL: zext_i1_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i1 %a to i16
   ret i16 %1
 }
 
 define i32 @zext_i1_to_i32(i1 %a) {
 ; RV32I-LABEL: zext_i1_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i1 %a to i32
   ret i32 %1
 }
 
 define i64 @zext_i1_to_i64(i1 %a) {
 ; RV32I-LABEL: zext_i1_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 1
 ; RV32I-NEXT:    addi a1, zero, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i1 %a to i64
   ret i64 %1
 }
 
 define i16 @zext_i8_to_i16(i8 %a) {
 ; RV32I-LABEL: zext_i8_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 255
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i8 %a to i16
   ret i16 %1
 }
 
 define i32 @zext_i8_to_i32(i8 %a) {
 ; RV32I-LABEL: zext_i8_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 255
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i8 %a to i32
   ret i32 %1
 }
 
 define i64 @zext_i8_to_i64(i8 %a) {
 ; RV32I-LABEL: zext_i8_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    andi a0, a0, 255
 ; RV32I-NEXT:    addi a1, zero, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i8 %a to i64
   ret i64 %1
 }
 
 define i32 @zext_i16_to_i32(i16 %a) {
 ; RV32I-LABEL: zext_i16_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 16
 ; RV32I-NEXT:    addi a1, a1, -1
 ; RV32I-NEXT:    and a0, a0, a1
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i16 %a to i32
   ret i32 %1
 }
 
 define i64 @zext_i16_to_i64(i16 %a) {
 ; RV32I-LABEL: zext_i16_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a1, 16
 ; RV32I-NEXT:    addi a1, a1, -1
 ; RV32I-NEXT:    and a0, a0, a1
 ; RV32I-NEXT:    addi a1, zero, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i16 %a to i64
   ret i64 %1
 }
 
 define i64 @zext_i32_to_i64(i32 %a) {
 ; RV32I-LABEL: zext_i32_to_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    addi a1, zero, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = zext i32 %a to i64
   ret i64 %1
 }
 
 ; TODO: should the trunc tests explicitly ensure no code is generated before
 ; jalr?
 
 define i1 @trunc_i8_to_i1(i8 %a) {
 ; RV32I-LABEL: trunc_i8_to_i1:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i8 %a to i1
   ret i1 %1
 }
 
 define i1 @trunc_i16_to_i1(i16 %a) {
 ; RV32I-LABEL: trunc_i16_to_i1:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i16 %a to i1
   ret i1 %1
 }
 
 define i1 @trunc_i32_to_i1(i32 %a) {
 ; RV32I-LABEL: trunc_i32_to_i1:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i32 %a to i1
   ret i1 %1
 }
 
 define i1 @trunc_i64_to_i1(i64 %a) {
 ; RV32I-LABEL: trunc_i64_to_i1:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i64 %a to i1
   ret i1 %1
 }
 
 define i8 @trunc_i16_to_i8(i16 %a) {
 ; RV32I-LABEL: trunc_i16_to_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i16 %a to i8
   ret i8 %1
 }
 
 define i8 @trunc_i32_to_i8(i32 %a) {
 ; RV32I-LABEL: trunc_i32_to_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i32 %a to i8
   ret i8 %1
 }
 
 define i8 @trunc_i64_to_i8(i64 %a) {
 ; RV32I-LABEL: trunc_i64_to_i8:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i64 %a to i8
   ret i8 %1
 }
 
 define i16 @trunc_i32_to_i16(i32 %a) {
 ; RV32I-LABEL: trunc_i32_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i32 %a to i16
   ret i16 %1
 }
 
 define i16 @trunc_i64_to_i16(i64 %a) {
 ; RV32I-LABEL: trunc_i64_to_i16:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i64 %a to i16
   ret i16 %1
 }
 
 define i32 @trunc_i64_to_i32(i64 %a) {
 ; RV32I-LABEL: trunc_i64_to_i32:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = trunc i64 %a to i32
   ret i32 %1
 }

test/CodeGen/RISCV/shifts.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; Basic shift support is tested as part of ALU.ll. This file ensures that
 ; shifts which may not be supported natively are lowered properly.
 
 define i64 @lshr64(i64 %a, i64 %b) nounwind {
 ; RV32I-LABEL: lshr64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a3, %hi(__lshrdi3)
 ; RV32I-NEXT:    addi a3, a3, %lo(__lshrdi3)
 ; RV32I-NEXT:    jalr ra, a3, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = lshr i64 %a, %b
   ret i64 %1
 }
 
 define i64 @ashr64(i64 %a, i64 %b) nounwind {
 ; RV32I-LABEL: ashr64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a3, %hi(__ashrdi3)
 ; RV32I-NEXT:    addi a3, a3, %lo(__ashrdi3)
 ; RV32I-NEXT:    jalr ra, a3, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = ashr i64 %a, %b
   ret i64 %1
 }
 
 define i64 @shl64(i64 %a, i64 %b) nounwind {
 ; RV32I-LABEL: shl64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
 ; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a3, %hi(__ashldi3)
 ; RV32I-NEXT:    addi a3, a3, %lo(__ashldi3)
 ; RV32I-NEXT:    jalr ra, a3, 0
+; RV32I-NEXT:    lw s0, 8(sp)
 ; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = shl i64 %a, %b
   ret i64 %1
 }

test/CodeGen/RISCV/wide-mem.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck %s -check-prefix=RV32I
 
 ; Check load/store operations on values wider than what is natively supported
 
 define i64 @load_i64(i64 *%a) nounwind {
 ; RV32I-LABEL: load_i64:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lw a2, 0(a0)
 ; RV32I-NEXT:    lw a1, 4(a0)
 ; RV32I-NEXT:    addi a0, a2, 0
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = load i64, i64* %a
   ret i64 %1
 }
 
 @val64 = local_unnamed_addr global i64 2863311530, align 8
 
 ; TODO: codegen on this should be improved. It shouldn't be necessary to
 ; generate two addi
 define i64 @load_i64_global() nounwind {
 ; RV32I-LABEL: load_i64_global:
 ; RV32I:       # BB#0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp)
+; RV32I-NEXT:    sw s0, 8(sp)
+; RV32I-NEXT:    addi s0, sp, 16
 ; RV32I-NEXT:    lui a0, %hi(val64)
 ; RV32I-NEXT:    addi a0, a0, %lo(val64)
 ; RV32I-NEXT:    lw a0, 0(a0)
 ; RV32I-NEXT:    lui a1, %hi(val64+4)
 ; RV32I-NEXT:    addi a1, a1, %lo(val64+4)
 ; RV32I-NEXT:    lw a1, 0(a1)
+; RV32I-NEXT:    lw s0, 8(sp)
+; RV32I-NEXT:    lw ra, 12(sp)
+; RV32I-NEXT:    addi sp, sp, 16
 ; RV32I-NEXT:    jalr zero, ra, 0
   %1 = load i64, i64* @val64
   ret i64 %1
 }