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Re-materialization is for uses only. 

llvm-svn: 49053
This commit is contained in:
Evan Cheng 2008-04-01 21:37:32 +00:00
parent ce4f31d3ce
commit 985a0b51d7
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -794,7 +794,7 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
/// folding is possible.
bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
SmallVector<unsigned, 2> &Ops,
bool ReMatLoad) const {
bool ReMat) const {
// Filter the list of operand indexes that are to be folded. Abort if
// any operand will prevent folding.
unsigned MRInfo = 0;
@ -802,8 +802,8 @@ bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
if (FilterFoldedOps(MI, Ops, MRInfo, FoldOps))
return false;
// Can't fold a remat'ed load into a two address instruction.
if (ReMatLoad && (MRInfo & VirtRegMap::isMod))
// It's only legal to remat for a use, not a def.
if (ReMat && (MRInfo & VirtRegMap::isMod))
return false;
return tii_->canFoldMemoryOperand(MI, FoldOps);
@ -947,7 +947,7 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
goto RestartInstruction;
}
} else {
CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat && isLoad);
CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat);
}
} else
CanFold = false;