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9727d7a8ef
Llvm-stress discovered that a COPY may end up in ExpandPostRA::LowerCopy() with an undef source operand. It is not possible for the target to handle this, as this flag is not passed to TII->copyPhysReg(). This patch solves this by treating such a COPY as an identity COPY. Review: Matthias Braun https://reviews.llvm.org/D32892 llvm-svn: 302877
15 lines
516 B
YAML
15 lines
516 B
YAML
# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -run-pass=postrapseudos -o - %s | FileCheck %s
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#
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# Test that a COPY with an undef source operand gets handled like an identity
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# copy rather than lowered into a target instruction with the undef flag
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# dropped.
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---
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# CHECK-LABEL: name: undef_copy
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# CHECK: %r13d = KILL undef %r0d, implicit killed %r12q, implicit-def %r12q
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name: undef_copy
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: %r12q
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%r13d = COPY undef %r0d, implicit killed %r12q, implicit-def %r12q
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