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Re-materialization is for uses only.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49053 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-04-01 21:37:32 +00:00
parent 38c92263eb
commit 3c75ba858b
1 changed files with 4 additions and 4 deletions
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8
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -794,7 +794,7 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
/// folding is possible. /// folding is possible.
bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI, bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
SmallVector<unsigned, 2> &Ops, SmallVector<unsigned, 2> &Ops,
bool ReMatLoad) const { bool ReMat) const {
// Filter the list of operand indexes that are to be folded. Abort if // Filter the list of operand indexes that are to be folded. Abort if
// any operand will prevent folding. // any operand will prevent folding.
unsigned MRInfo = 0; unsigned MRInfo = 0;
@ -802,8 +802,8 @@ bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
if (FilterFoldedOps(MI, Ops, MRInfo, FoldOps)) if (FilterFoldedOps(MI, Ops, MRInfo, FoldOps))
return false; return false;
// Can't fold a remat'ed load into a two address instruction. // It's only legal to remat for a use, not a def.
if (ReMatLoad && (MRInfo & VirtRegMap::isMod)) if (ReMat && (MRInfo & VirtRegMap::isMod))
return false; return false;
return tii_->canFoldMemoryOperand(MI, FoldOps); return tii_->canFoldMemoryOperand(MI, FoldOps);
@ -947,7 +947,7 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
goto RestartInstruction; goto RestartInstruction;
} }
} else { } else {
CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat && isLoad); CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat);
} }
} else } else
CanFold = false; CanFold = false;