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Accept null PhysReg arguments to checkRegMaskInterference.

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Calling checkRegMaskInterference(VirtReg) checks if VirtReg crosses any
regmask operands, regardless of the registers they clobber.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158563 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-06-15 22:24:22 +00:00
parent 12a88f81de
commit eb06b0b6aa
2 changed files with 3 additions and 2 deletions
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2
lib/CodeGen/LiveRegMatrix.cpp
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@ -110,7 +110,7 @@ bool LiveRegMatrix::checkRegMaskInterference(LiveInterval &VirtReg,
// The BitVector is indexed by PhysReg, not register unit.
// Regmask interference is more fine grained than regunits.
// For example, a Win64 call can clobber %ymm8 yet preserve %xmm8.
return !RegMaskUsable.empty() && !RegMaskUsable.test(PhysReg);
return !RegMaskUsable.empty() && (!PhysReg || !RegMaskUsable.test(PhysReg));
}
bool LiveRegMatrix::checkRegUnitInterference(LiveInterval &VirtReg,