e6b85c3027
Followup to D59363 which failed to handle the icmp(X,undef) -> isTrueWhenEqual case - similar to llvm::ConstantFoldCompareInstruction
As discussed on the review, this is affecting some previously reduced test cases, but will also prevent reductions from relying on this inconsistent behaviour in the future.
Reapplied after reversion at e1e3c75c7d with a tweak to the pseudo-probe-peep.ll test
Differential Revision: https://reviews.llvm.org/D158068
31 lines
1.1 KiB
LLVM
31 lines
1.1 KiB
LLVM
; REQUIRES: x86_64-linux
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; RUN: llc -mtriple=x86_64-- -stop-after=peephole-opt -o - %s | FileCheck %s
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define internal i32 @arc_compare(i1 %c) {
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entry:
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%0 = load i64, ptr undef, align 8
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br i1 %c, label %return, label %if.end
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if.end: ; preds = %entry
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; Chek a register copy has been sinked into the compare instruction.
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; CHECK: %[[#REG:]]:gr64 = IMPLICIT_DEF
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; CHECK-NOT: %[[#]]:gr64 = MOV64rm %[[#REG]]
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; CHECK: PSEUDO_PROBE 5116412291814990879, 3, 0, 0
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; CHECK: CMP64mi32 %[[#REG]], 1
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 3, i32 0, i64 -1)
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%cmp4 = icmp slt i64 %0, 0
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br i1 %cmp4, label %return, label %if.end6
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if.end6: ; preds = %if.end
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call void @llvm.pseudoprobe(i64 5116412291814990879, i64 5, i32 0, i64 -1)
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br label %return
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return: ; preds = %if.end6, %if.end, %entry
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ret i32 undef
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}
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; Function Attrs: inaccessiblememonly nounwind willreturn
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declare void @llvm.pseudoprobe(i64, i64, i32, i64) #0
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attributes #0 = { inaccessiblememonly nounwind willreturn }
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