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https://github.com/Gericom/teak-llvm.git
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5c29e8c65f
Summary: Guard against a potential crash observed in https://github.com/JuliaLang/julia/issues/32994#issuecomment-524249628 If two branches are collapsed we can encounter a degenerate conditional branch `TBB==FBB`. The subsequent code assumes that they differ, so we exit out early. Reviewers: ributzka, spatel Subscribers: loladiro, dexonsmith, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66657
19 lines
634 B
LLVM
19 lines
634 B
LLVM
; RUN: llc -fast-isel=true -O1 -mtriple=x86_64-unkown-linux-gnu -start-before=codegenprepare -stop-after=codegenprepare -o - < %s | FileCheck %s
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; CHECK-LABEL: @foo
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define void @foo() {
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top:
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; CHECK: br label %L34
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br label %L34
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L34: ; preds = %L34, %L34, %top
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%.sroa.075.0 = phi i64 [ undef, %top ], [ undef, %L34 ], [ undef, %L34 ]
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%0 = icmp sgt i8 undef, -1
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%cond5896 = icmp eq i8 0, 2
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%cond58 = and i1 %cond5896, %0
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; During codegenprepare such degenerate branches can occur and should not
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; lead to crashes.
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; CHECK: br label %L34
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br i1 %cond58, label %L34, label %L34
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}
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