forked from OSchip/llvm-project
33 lines
729 B
LLVM
33 lines
729 B
LLVM
; RUN: opt < %s -lcssa -licm -S | FileCheck %s
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; PR30454
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare i8 @bar()
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; Test that we preserve LCSSA form when removing edges from unreachable blocks.
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; CHECK-LABEL: @foo
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define void @foo() {
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entry:
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br label %for.cond
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for.cond:
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%x = phi i8 [ undef, %entry ], [ %y, %for.latch ]
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br i1 undef, label %for.latch, label %exit
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; CHECK: unreachable.bb:
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; CHECK-NEXT: unreachable
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unreachable.bb:
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br i1 undef, label %exit, label %for.latch
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for.latch:
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%y = call i8 @bar()
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br label %for.cond
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; CHECK: exit:
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; CHECK-NEXT: %x.lcssa = phi i8 [ %x, %for.cond ]
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exit:
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%z = zext i8 %x to i32
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ret void
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}
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