[RISCV] Add a LocalStackSlotAllocation test

[jrtc27]

llvm/test/CodeGen/RISCV/local-stack-slot-allocation.ll

2–3

RV32? update_llc_test_checks.py?

[StephenFan]

Add RV32 run line.

[craig.topper]

LGTM

llvm/test/CodeGen/RISCV/local-stack-slot-allocation.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s | FileCheck %s --check-prefix=RV32I
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s | FileCheck %s --check-prefix=RV64I
+
+; This test case test the LocalStackSlotAllocation pass that use a base register
+; for the frame index that its offset is out-of-range (for RISC-V. the immediate
+; is 12 bits for the load store instruction (excludes vector load / store))
+; TODO: Enable LocalStackSlotAllocation pass.
+define void @use_frame_base_reg() {
+; RV32I-LABEL: use_frame_base_reg:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    lui a0, 24
+; RV32I-NEXT:    addi a0, a0, 1712
+; RV32I-NEXT:    sub sp, sp, a0
+; RV32I-NEXT:    .cfi_def_cfa_offset 100016
+; RV32I-NEXT:    lui a0, 24
+; RV32I-NEXT:    addi a0, a0, 1708
+; RV32I-NEXT:    add a0, sp, a0
+; RV32I-NEXT:    lb a0, 0(a0)
+; RV32I-NEXT:    lui a0, 24
+; RV32I-NEXT:    addi a0, a0, 1704
+; RV32I-NEXT:    add a0, sp, a0
+; RV32I-NEXT:    lb a0, 0(a0)
+; RV32I-NEXT:    lui a0, 24
+; RV32I-NEXT:    addi a0, a0, 1712
+; RV32I-NEXT:    add sp, sp, a0
+; RV32I-NEXT:    ret
+;
+; RV64I-LABEL: use_frame_base_reg:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    lui a0, 24
+; RV64I-NEXT:    addiw a0, a0, 1712
+; RV64I-NEXT:    sub sp, sp, a0
+; RV64I-NEXT:    .cfi_def_cfa_offset 100016
+; RV64I-NEXT:    lui a0, 24
+; RV64I-NEXT:    addiw a0, a0, 1708
+; RV64I-NEXT:    add a0, sp, a0
+; RV64I-NEXT:    lb a0, 0(a0)
+; RV64I-NEXT:    lui a0, 24
+; RV64I-NEXT:    addiw a0, a0, 1704
+; RV64I-NEXT:    add a0, sp, a0
+; RV64I-NEXT:    lb a0, 0(a0)
+; RV64I-NEXT:    lui a0, 24
+; RV64I-NEXT:    addiw a0, a0, 1712
+; RV64I-NEXT:    add sp, sp, a0
+; RV64I-NEXT:    ret
+
+  %va = alloca i8, align 4
+  %va1 = alloca i8, align 4
+  %large = alloca [ 100000 x i8 ]
+  %argp.cur = load volatile i8, i8* %va, align 4
+  %argp.next = load volatile i8, i8* %va1, align 4
+  ret void
+}