2017-01-18 16:32:54 +08:00
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; Test that the backend does not mess up the I/R in case of a use of an undef
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; register. This typically happens while expanding a pseudo or otherwise
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; replacing an instruction for another.
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;
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2017-01-18 19:40:28 +08:00
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 -verify-machineinstrs | FileCheck %s
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2017-01-18 16:32:54 +08:00
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; LLCRMux
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define void @f1(i8*) {
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; CHECK-LABEL: f1:
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; CHECK-NOT: *** Bad machine code: Using an undefined physical register ***
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BB:
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%L5 = load i8, i8* %0
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%B9 = lshr i8 %L5, -1
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br label %CF
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CF: ; preds = %CF, %BB
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%Cmp25 = icmp ne i8 27, %B9
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br i1 %Cmp25, label %CF, label %CF34
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CF34: ; preds = %CF
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ret void
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}
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