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.
18 lines
505 B
LLVM
18 lines
505 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=riscv64 | FileCheck %s
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define void @test_shadow_optimization() {
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; CHECK-LABEL: test_shadow_optimization:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: ret
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entry:
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 0, i32 16)
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ret void
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}
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declare void @llvm.experimental.stackmap(i64, i32, ...)
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