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Clear preference when it no longer makes sense.

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llvm-svn: 56019
This commit is contained in:
Evan Cheng 2008-09-09 21:44:23 +00:00
parent ed0ea8049f
commit f3a3ee6d01
1 changed files with 8 additions and 0 deletions
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8
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1317,6 +1317,14 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
}
}
// If resulting interval has a preference that no longer fits because of subreg
// coalescing, just clear the preference.
if (ResDstInt->preference && (isExtSubReg || isInsSubReg)) {
const TargetRegisterClass *RC = mri_->getRegClass(ResDstInt->reg);
if (!RC->contains(ResDstInt->preference))
ResDstInt->preference = 0;
}
DOUT << "\n\t\tJoined. Result = "; ResDstInt->print(DOUT, tri_);
DOUT << "\n";