97982a8c60
This patch adds CFI instructions in the function epilogue. Before patch: addi sp, s0, -32 ld ra, 24(sp) # 8-byte Folded Reload ld s0, 16(sp) # 8-byte Folded Reload ld s1, 8(sp) # 8-byte Folded Reload addi sp, sp, 32 ret After patch: addi sp, s0, -32 .cfi_def_cfa sp, 32 ld ra, 24(sp) # 8-byte Folded Reload ld s0, 16(sp) # 8-byte Folded Reload ld s1, 8(sp) # 8-byte Folded Reload .cfi_restore ra .cfi_restore s0 .cfi_restore s1 addi sp, sp, 32 .cfi_def_cfa_offset 0 ret This functionality is already present in `riscv-gcc`, but it’s not in `clang` and this slightly impairs the `lldb` debugging experience, e.g. backtrace.
91 lines
2.9 KiB
LLVM
91 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
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; RUN: llc -mtriple=riscv32 -mattr=+f,+zcmp -target-abi ilp32f -verify-machineinstrs < %s | FileCheck %s --check-prefix=RV32
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; RUN: llc -mtriple=riscv64 -mattr=+f,+zcmp -target-abi lp64f -verify-machineinstrs < %s | FileCheck %s --check-prefix=RV64
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declare void @callee()
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; Test the file could be compiled successfully.
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define float @foo(float %arg) {
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; RV32-LABEL: foo:
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; RV32: # %bb.0: # %entry
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; RV32-NEXT: cm.push {ra}, -32
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; RV32-NEXT: .cfi_def_cfa_offset 32
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; RV32-NEXT: .cfi_offset ra, -4
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; RV32-NEXT: fsw fs0, 12(sp) # 4-byte Folded Spill
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; RV32-NEXT: .cfi_offset fs0, -20
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; RV32-NEXT: fmv.s fs0, fa0
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; RV32-NEXT: call callee
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; RV32-NEXT: fmv.s fa0, fs0
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; RV32-NEXT: flw fs0, 12(sp) # 4-byte Folded Reload
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; RV32-NEXT: .cfi_restore fs0
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; RV32-NEXT: cm.popret {ra}, 32
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;
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; RV64-LABEL: foo:
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; RV64: # %bb.0: # %entry
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; RV64-NEXT: cm.push {ra}, -32
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; RV64-NEXT: .cfi_def_cfa_offset 32
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; RV64-NEXT: .cfi_offset ra, -8
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; RV64-NEXT: fsw fs0, 12(sp) # 4-byte Folded Spill
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; RV64-NEXT: .cfi_offset fs0, -20
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; RV64-NEXT: fmv.s fs0, fa0
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; RV64-NEXT: call callee
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; RV64-NEXT: fmv.s fa0, fs0
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; RV64-NEXT: flw fs0, 12(sp) # 4-byte Folded Reload
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; RV64-NEXT: .cfi_restore fs0
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; RV64-NEXT: cm.popret {ra}, 32
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entry:
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call void @callee()
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ret float %arg
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}
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define void @foo2(i32 %x, float %y) {
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; RV32-LABEL: foo2:
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; RV32: # %bb.0: # %entry
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; RV32-NEXT: cm.push {ra, s0}, -32
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; RV32-NEXT: .cfi_def_cfa_offset 32
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; RV32-NEXT: .cfi_offset ra, -8
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; RV32-NEXT: .cfi_offset s0, -4
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; RV32-NEXT: fsw fs0, 12(sp) # 4-byte Folded Spill
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; RV32-NEXT: .cfi_offset fs0, -20
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; RV32-NEXT: fmv.s fs0, fa0
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; RV32-NEXT: mv s0, a0
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; RV32-NEXT: call bar
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; RV32-NEXT: mv a0, s0
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; RV32-NEXT: fmv.s fa0, fs0
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; RV32-NEXT: flw fs0, 12(sp) # 4-byte Folded Reload
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; RV32-NEXT: .cfi_restore fs0
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; RV32-NEXT: cm.pop {ra, s0}, 32
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; RV32-NEXT: .cfi_restore ra
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; RV32-NEXT: .cfi_restore s0
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; RV32-NEXT: .cfi_def_cfa_offset 0
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; RV32-NEXT: tail func
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;
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; RV64-LABEL: foo2:
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; RV64: # %bb.0: # %entry
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; RV64-NEXT: cm.push {ra, s0}, -32
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; RV64-NEXT: .cfi_def_cfa_offset 32
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; RV64-NEXT: .cfi_offset ra, -16
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; RV64-NEXT: .cfi_offset s0, -8
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; RV64-NEXT: fsw fs0, 12(sp) # 4-byte Folded Spill
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; RV64-NEXT: .cfi_offset fs0, -20
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; RV64-NEXT: fmv.s fs0, fa0
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; RV64-NEXT: mv s0, a0
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; RV64-NEXT: call bar
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; RV64-NEXT: mv a0, s0
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; RV64-NEXT: fmv.s fa0, fs0
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; RV64-NEXT: flw fs0, 12(sp) # 4-byte Folded Reload
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; RV64-NEXT: .cfi_restore fs0
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; RV64-NEXT: cm.pop {ra, s0}, 32
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; RV64-NEXT: .cfi_restore ra
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; RV64-NEXT: .cfi_restore s0
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; RV64-NEXT: .cfi_def_cfa_offset 0
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; RV64-NEXT: tail func
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entry:
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tail call void @bar()
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tail call void @func(i32 %x, float %y)
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ret void
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}
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declare void @bar()
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declare void @func(i32, float)
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