diff options
| author | Jonas Paulsson <paulsson@linux.vnet.ibm.com> | 2017-05-12 06:32:03 +0000 |
|---|---|---|
| committer | Jonas Paulsson <paulsson@linux.vnet.ibm.com> | 2017-05-12 06:32:03 +0000 |
| commit | 668e541eeda0155667962f0c00d9ccb8c09113b3 (patch) | |
| tree | 88b79ff5565f830607dc55ef690513d380d3ccc0 /test/CodeGen/SystemZ | |
| parent | e43c10d2019850118e3f6aec5438343f053991ce (diff) | |
Handle a COPY with undef source operand in LowerCopy()
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302877 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/SystemZ')
| -rw-r--r-- | test/CodeGen/SystemZ/lower-copy-undef-src.mir | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/lower-copy-undef-src.mir b/test/CodeGen/SystemZ/lower-copy-undef-src.mir new file mode 100644 index 00000000000..322460d79d6 --- /dev/null +++ b/test/CodeGen/SystemZ/lower-copy-undef-src.mir @@ -0,0 +1,14 @@ +# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -run-pass=postrapseudos -o - %s | FileCheck %s +# +# Test that a COPY with an undef source operand gets handled like an identity +# copy rather than lowered into a target instruction with the undef flag +# dropped. +--- +# CHECK-LABEL: name: undef_copy +# CHECK: %r13d = KILL undef %r0d, implicit killed %r12q, implicit-def %r12q +name: undef_copy +tracksRegLiveness: true +body: | + bb.0: + liveins: %r12q + %r13d = COPY undef %r0d, implicit killed %r12q, implicit-def %r12q |