92dc4fff87
I removed the conflict check from computeKnownBitsFromShiftOperator() in D150648 assuming that this is now handled on the KnownBits side. However, the nsw handling is still inside ValueTracking, so we still need to handle conflicts there. Restore the check closer to where it is relevant. Fixes https://github.com/llvm/llvm-project/issues/62908.
31 lines
646 B
LLVM
31 lines
646 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -S -passes=jump-threading < %s | FileCheck %s
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; Make sure this does not crash due to conflicting known bits.
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define i32 @test() {
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; CHECK-LABEL: define i32 @test() {
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; CHECK-NEXT: end:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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br label %join
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unreachable:
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%sh_prom = zext i32 -1 to i64
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%shl = shl nsw i64 -1, %sh_prom
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%conv = trunc i64 %shl to i32
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br label %join
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join:
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%phi = phi i32 [ %conv, %unreachable ], [ 0, %entry ]
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%cmp = icmp eq i32 %phi, 0
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br i1 %cmp, label %end, label %if
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if:
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br label %end
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end:
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ret i32 0
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}
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