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bcda8ae597
Summary: Removing an assumption (assert) that the CmpInst already has been simplified in getFlippedStrictnessPredicateAndConstant. Solution is to simply bail out instead of hitting the assertion. Instead we assume that any profitable rewrite will happen in the next iteration of InstCombine. The reason why we can't assume that the CmpInst already has been simplified is that the worklist does not guarantee such an ordering. Solves https://bugs.llvm.org/show_bug.cgi?id=43376 Reviewers: spatel, lebedev.ri Reviewed By: lebedev.ri Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68022 llvm-svn: 372972
37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; We used to hit an assertion in getFlippedStrictnessPredicateAndConstant due
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; to assuming that edge cases such as %cmp (ult x, 0) already has been
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; simplified. But that depends on the worklist order, so that is not always
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; guaranteed.
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define i16 @d(i16* %d.a, i16* %d.b) {
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; CHECK-LABEL: @d(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T0:%.*]] = load i16, i16* [[D_A:%.*]], align 1
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i16 [[T0]], 0
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[LAND_END:%.*]], label [[LAND_RHS:%.*]]
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; CHECK: land.rhs:
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; CHECK-NEXT: br label [[LAND_END]]
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; CHECK: land.end:
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; CHECK-NEXT: ret i16 -1
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;
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entry:
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%t0 = load i16, i16* %d.a, align 1
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%tobool = icmp ne i16 %t0, 0
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br i1 %tobool, label %land.rhs, label %land.end
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land.rhs:
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%t1 = load i16, i16* %d.b, align 1
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%cmp = icmp ult i16 %t1, 0
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br label %land.end
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land.end:
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%t2 = phi i1 [ false, %entry ], [ %cmp, %land.rhs ]
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%land.ext = zext i1 %t2 to i16
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%mul = mul nsw i16 %land.ext, 3
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%neg = xor i16 %mul, -1
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ret i16 %neg
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}
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