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93b123f786
In both ADCE and BDCE (via DemandedBits) we should not remove instructions that are not guaranteed to return. This issue was pointed out by fhahn in the recent llvm-dev thread. Differential Revision: https://reviews.llvm.org/D96993
19 lines
468 B
LLVM
19 lines
468 B
LLVM
; RUN: opt -S -bdce < %s | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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define void @PR34211(i16* %p) {
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; CHECK-LABEL: @PR34211
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%not_demanded_but_not_dead = load volatile i16, i16* %p
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call void @no_side_effects_so_dead(i16 %not_demanded_but_not_dead)
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ret void
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; CHECK: %not_demanded_but_not_dead = load volatile i16, i16* %p
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; CHECK-NEXT: ret void
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}
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declare void @no_side_effects_so_dead(i16) #0
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attributes #0 = { nounwind readnone willreturn }
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