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Use the proper clobber check in handleLiveInRegister().

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When a physreg is live in to a basic block, look for any instruction in
the block that clobbers the physreg.

The instruction doesn't have to properly redefine the register, any
overlapping clobber is OK.

This slightly changes live ranges when compiling with register masks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150528 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-02-14 23:46:24 +00:00
parent f658af5484
commit 6b7913893b
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -507,7 +507,7 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
end = baseIndex.getRegSlot();
SeenDefUse = true;
break;
} else if (mi->definesRegister(interval.reg, tri_)) {
} else if (mi->modifiesRegister(interval.reg, tri_)) {
// Another instruction redefines the register before it is ever read.
// Then the register is essentially dead at the instruction that defines
// it. Hence its interval is: