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| author | Hal Finkel <hfinkel@anl.gov> | 2014-03-27 22:46:28 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2014-03-27 22:46:28 +0000 |
| commit | be77894aef60c9aa1f84110090102b437a6e885b (patch) | |
| tree | 9036f82777443c63da11784560755f17c1e46d12 /unittests | |
| parent | d21857ce15127eb3eb6d6957983906e30a0506b7 (diff) | |
| download | llvm-be77894aef60c9aa1f84110090102b437a6e885b.tar.gz llvm-be77894aef60c9aa1f84110090102b437a6e885b.tar.bz2 llvm-be77894aef60c9aa1f84110090102b437a6e885b.tar.xz | |
[PowerPC] Don't remove self VSX copies in PPCInstrInfo::copyPhysReg
Because of how the allocation of VSX registers interacts with the call-lowering
code, we sometimes end up generating self VSX copies. Specifically, things like
this:
%VSL2<def> = COPY %F2, %VSL2<imp-use,kill>
(where %F2 is really a sub-register of %VSL2, and so this copy is a nop)
The problem is that ExpandPostRAPseudos always assumes that *some* instruction
has been inserted, and adds implicit defs to it. This is a problem if no copy
was inserted because it can cause subtle problems during post-RA scheduling.
These self copies will have to be removed some other way.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204976 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'unittests')
0 files changed, 0 insertions, 0 deletions