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Check regmask interference for -join-physregs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150404 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-02-13 18:17:04 +00:00
parent 9ea7e6e308
commit 3ed4dee530
1 changed files with 8 additions and 0 deletions
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8
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;