diff --git a/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp b/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp --- a/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp +++ b/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp @@ -865,12 +865,15 @@ const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo(); MipsFunctionInfo *MipsFI = MF.getInfo(); MipsABIInfo ABI = STI.getABI(); + unsigned RA = ABI.IsN64() ? Mips::RA_64 : Mips::RA; unsigned FP = ABI.GetFramePtr(); unsigned BP = ABI.IsN64() ? Mips::S7_64 : Mips::S7; - // Mark $fp as used if function has dedicated frame pointer. - if (hasFP(MF)) + // Mark $ra and $fp as used if function has dedicated frame pointer. + if (hasFP(MF)) { + setAliasRegs(MF, SavedRegs, RA); setAliasRegs(MF, SavedRegs, FP); + } // Mark $s7 as used if function has dedicated base pointer. if (hasBP(MF)) setAliasRegs(MF, SavedRegs, BP); diff --git a/llvm/test/CodeGen/Mips/no-frame-pointer-elim.ll b/llvm/test/CodeGen/Mips/no-frame-pointer-elim.ll new file mode 100644 --- /dev/null +++ b/llvm/test/CodeGen/Mips/no-frame-pointer-elim.ll @@ -0,0 +1,37 @@ +; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py +; RUN: llc -march=mips64 -relocation-model=static < %s \ +; RUN: | FileCheck %s --check-prefix STATIC +; RUN: llc -march=mips64 -relocation-model=pic < %s \ +; RUN: | FileCheck %s --check-prefix PIC + +declare dso_local void @callee() noreturn nounwind + +define dso_local void @caller() nounwind "no-frame-pointer-elim-non-leaf" { +; STATIC-LABEL: caller: +; STATIC: # %bb.0: # %entry +; STATIC-NEXT: daddiu $sp, $sp, -16 +; STATIC-NEXT: sd $ra, 8($sp) # 8-byte Folded Spill +; STATIC-NEXT: sd $fp, 0($sp) # 8-byte Folded Spill +; STATIC-NEXT: move $fp, $sp +; STATIC-NEXT: jal callee +; STATIC-NEXT: nop +; +; PIC-LABEL: caller: +; PIC: # %bb.0: # %entry +; PIC-NEXT: daddiu $sp, $sp, -32 +; PIC-NEXT: sd $ra, 24($sp) # 8-byte Folded Spill +; PIC-NEXT: sd $fp, 16($sp) # 8-byte Folded Spill +; PIC-NEXT: sd $gp, 8($sp) # 8-byte Folded Spill +; PIC-NEXT: move $fp, $sp +; PIC-NEXT: lui $1, %hi(%neg(%gp_rel(caller))) +; PIC-NEXT: daddu $1, $1, $25 +; PIC-NEXT: daddiu $gp, $1, %lo(%neg(%gp_rel(caller))) +; PIC-NEXT: ld $25, %call16(callee)($gp) +; PIC-NEXT: .reloc .Ltmp0, R_MIPS_JALR, callee +; PIC-NEXT: .Ltmp0: +; PIC-NEXT: jalr $25 +; PIC-NEXT: nop +entry: + tail call void @callee() + unreachable +}