0410720985
Closes #147869 Closes #149679 Adds a check for a missing loop preheader during analysis. This fixes a nullptr dereference that happened whenever LoopSimplify was unable to generate a preheader because the loop was entered by an indirectbr instruction (as stated in the LoopSimplify.cpp doc comment).
29 lines
887 B
LLVM
29 lines
887 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -enable-loop-simplifycfg-term-folding=true -passes='require<domtree>,loop(loop-simplifycfg)' -verify-loop-info -verify-dom-info -verify-loop-lcssa < %s | FileCheck %s
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define void @test(ptr %addr) {
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; CHECK-LABEL: define void @test(
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; CHECK-SAME: ptr [[ADDR:%.*]]) {
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; CHECK-NEXT: indirectbr ptr [[ADDR]], [label %[[A:.*]], label %C]
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; CHECK: [[A]]:
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; CHECK-NEXT: br i1 true, label %[[B:.*]], label %[[C_LOOPEXIT:.*]]
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; CHECK: [[B]]:
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; CHECK-NEXT: br i1 true, label %[[A]], label %[[C_LOOPEXIT]]
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; CHECK: [[C_LOOPEXIT]]:
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; CHECK-NEXT: br label %[[C:.*]]
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; CHECK: [[C]]:
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; CHECK-NEXT: unreachable
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;
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indirectbr ptr %addr, [label %A, label %C]
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A:
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br i1 true, label %B, label %C
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B:
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br i1 true, label %A, label %C
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C:
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unreachable
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}
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