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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-10-12 00:06:23 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-10-12 00:06:23 +0000 |
| commit | 1c062c24aba08962b4687f56b274f182e5b7a8e5 (patch) | |
| tree | 748a2179f039b93e4586c59726da9c05dc9d0b9f /lib/CodeGen/SelectionDAG/TargetLowering.cpp | |
| parent | fad62874883ab78af47b4eeba042775a67ea7515 (diff) | |
Fix -widen-vmovs liveness issues.
When widening a copy, we are reading a larger register that may not be
live. Use an <undef> flag to tell the register scavenger and machine
code verifier that we know the value isn't defined.
We now widen:
%S6<def> = COPY %S4<kill>, %D3<imp-def>
into:
%D3<def> = VMOVD %D2<undef>, pred:14, pred:%noreg, %S4<imp-use,kill>
This also keeps the <kill> flag on %S4 so we don't inadvertently kill a
live value in %S5.
Finally, ensure that ARMBaseInstrInfo::setExecutionDomain() preserves
the <undef> flag when converting VMOVD to VORR.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141746 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
0 files changed, 0 insertions, 0 deletions