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Check regmask interference for -join-physregs. 

llvm-svn: 150404
This commit is contained in:
Jakob Stoklund Olesen 2012-02-13 18:17:04 +00:00
parent 636d283202
commit 6f8fe71216
1 changed files with 8 additions and 0 deletions
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8
llvm/lib/CodeGen/RegisterCoalescer.cpp
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@ -1426,6 +1426,14 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) {
return true;
}
// Check if a register mask clobbers DstReg.
BitVector UsableRegs;
if (LIS->checkRegMaskInterference(RHS, UsableRegs) &&
!UsableRegs.test(CP.getDstReg())) {
DEBUG(dbgs() << "\t\tRegister mask interference.\n");
return false;
}
for (const unsigned *AS = TRI->getAliasSet(CP.getDstReg()); *AS; ++AS){
if (!LIS->hasInterval(*AS))
continue;