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| author | Hal Finkel <hfinkel@anl.gov> | 2013-12-11 23:12:25 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-12-11 23:12:25 +0000 |
| commit | 598ee5a3e7fe96cc4b3f92b8c17e393ffcff5293 (patch) | |
| tree | 4d7f6dad1f68d0fa858b4314950abaf8eaf94711 /lib/Target/PowerPC/PPCInstrInfo.cpp | |
| parent | 8bacb53cc6925f2af7f0f61f5bd06f34e46fc672 (diff) | |
| download | llvm-598ee5a3e7fe96cc4b3f92b8c17e393ffcff5293.tar.gz llvm-598ee5a3e7fe96cc4b3f92b8c17e393ffcff5293.tar.bz2 llvm-598ee5a3e7fe96cc4b3f92b8c17e393ffcff5293.tar.xz | |
Fix the PPC subsumes-predicate check
For one predicate to subsume another, they must both check the same condition
register. Failure to check this prerequisite was causing miscompiles.
Fixes PR18003.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197089 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/PPCInstrInfo.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCInstrInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp index bdeb649d22..c4582c540b 100644 --- a/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -988,6 +988,10 @@ bool PPCInstrInfo::SubsumesPredicate( if (Pred2[1].getReg() == PPC::CTR8 || Pred2[1].getReg() == PPC::CTR) return false; + // P1 can only subsume P2 if they test the same condition register. + if (Pred1[1].getReg() != Pred2[1].getReg()) + return false; + PPC::Predicate P1 = (PPC::Predicate) Pred1[0].getImm(); PPC::Predicate P2 = (PPC::Predicate) Pred2[0].getImm(); |