d5c9ffd545
This patch fixes a miscompilation when `N` gets CSEed to `Existing`: ``` Existing: t5: i32 = sub nuw Constant:i32<0>, t3 N: t30: i32 = sub Constant:i32<0>, t3 ``` Fixes https://github.com/llvm/llvm-project/issues/96366.
30 lines
893 B
LLVM
30 lines
893 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc < %s -mtriple=riscv64 | FileCheck %s
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declare void @use(i32)
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define i32 @f(i32 %x) nounwind {
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; CHECK-LABEL: f:
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; CHECK: # %bb.0:
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; CHECK-NEXT: addi sp, sp, -16
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; CHECK-NEXT: sd ra, 8(sp) # 8-byte Folded Spill
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; CHECK-NEXT: sd s0, 0(sp) # 8-byte Folded Spill
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; CHECK-NEXT: mv s0, a0
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; CHECK-NEXT: negw a0, a0
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; CHECK-NEXT: call use
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; CHECK-NEXT: li a0, 4
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; CHECK-NEXT: subw a0, a0, s0
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; CHECK-NEXT: ld ra, 8(sp) # 8-byte Folded Reload
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; CHECK-NEXT: ld s0, 0(sp) # 8-byte Folded Reload
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; CHECK-NEXT: addi sp, sp, 16
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; CHECK-NEXT: ret
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%sub1 = sub nuw i32 0, %x
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call void @use(i32 %sub1)
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%sub2 = sub i32 1, %x
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%sub3 = sub i32 3, %x
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%mul = mul i32 %x, 1
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%add1 = add i32 %sub2, %mul
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%add2 = add i32 %add1, %sub3
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ret i32 %add2
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}
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