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.
30 lines
943 B
LLVM
30 lines
943 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
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; RUN: llc < %s -mtriple=riscv32 | FileCheck %s
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define void @foo() {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: addi sp, sp, -2032
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; CHECK-NEXT: .cfi_def_cfa_offset 2032
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; CHECK-NEXT: sw ra, 2028(sp) # 4-byte Folded Spill
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; CHECK-NEXT: .cfi_offset ra, -4
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; CHECK-NEXT: li a0, -2048
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; CHECK-NEXT: sub sp, sp, a0
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; CHECK-NEXT: .cfi_def_cfa_offset 4294967280
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; CHECK-NEXT: addi a0, sp, 4
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; CHECK-NEXT: call use
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; CHECK-NEXT: li a0, -2048
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; CHECK-NEXT: add sp, sp, a0
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; CHECK-NEXT: .cfi_def_cfa_offset 2032
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; CHECK-NEXT: lw ra, 2028(sp) # 4-byte Folded Reload
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; CHECK-NEXT: .cfi_restore ra
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; CHECK-NEXT: addi sp, sp, 2032
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; CHECK-NEXT: .cfi_def_cfa_offset 0
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; CHECK-NEXT: ret
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%1 = alloca [1073741818 x i32], align 4
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call void @use(ptr %1)
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ret void
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}
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declare void @use(ptr)
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