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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-27 23:31:32 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-09-27 23:31:32 +0000 |
| commit | 83ef63efced9a957fe370134314645d2188c7203 (patch) | |
| tree | 834a1b64546a772c519b8b506b3b2fd013ef3e02 /lib/CodeGen/RegisterCoalescer.cpp | |
| parent | 6f6ea93c92bb56ef77f6165354d6f75189934531 (diff) | |
| download | llvm-83ef63efced9a957fe370134314645d2188c7203.tar.gz llvm-83ef63efced9a957fe370134314645d2188c7203.tar.bz2 llvm-83ef63efced9a957fe370134314645d2188c7203.tar.xz | |
Remove <def,read-undef> flags from partial redefinitions.
The new coalescer can turn a full virtual register definition into a
partial redef by merging another value into an unused vector lane.
Make sure to clear the <read-undef> flag on such defs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164807 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegisterCoalescer.cpp')
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index eb4ffe17a1..f45072f1ac 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1732,6 +1732,12 @@ void JoinVals::pruneValues(JoinVals &Other, case CR_Replace: // This value takes precedence over the value in Other.LI. LIS->pruneValue(&Other.LI, Def, &EndPoints); + // Remove <def,read-undef> flags. This def is now a partial redef. + if (!Def.isBlock()) + for (MIOperands MO(Indexes->getInstructionFromIndex(Def)); + MO.isValid(); ++MO) + if (MO->isReg() && MO->isDef() && MO->getReg() == LI.reg) + MO->setIsUndef(false); DEBUG(dbgs() << "\t\tpruned " << PrintReg(Other.LI.reg) << " at " << Def << ": " << Other.LI << '\n'); break; |