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All remat'ed loads cannot be folded into two-address code. Not just argument loads. This change doesn't really have any impact on codegen.
llvm-svn: 47557
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parent
9fb1d740a6
commit
17c9a98b59
@ -789,7 +789,7 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
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/// folding is possible.
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bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
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SmallVector<unsigned, 2> &Ops,
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bool ReMatLoadSS) const {
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bool ReMatLoad) const {
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// Filter the list of operand indexes that are to be folded. Abort if
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// any operand will prevent folding.
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unsigned MRInfo = 0;
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@ -797,8 +797,8 @@ bool LiveIntervals::canFoldMemoryOperand(MachineInstr *MI,
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if (FilterFoldedOps(MI, Ops, MRInfo, FoldOps))
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return false;
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// Can't fold a load from fixed stack slot into a two address instruction.
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if (ReMatLoadSS && (MRInfo & VirtRegMap::isMod))
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// Can't fold a remat'ed load into a two address instruction.
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if (ReMatLoad && (MRInfo & VirtRegMap::isMod))
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return false;
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return tii_->canFoldMemoryOperand(MI, FoldOps);
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@ -951,7 +951,7 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
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goto RestartInstruction;
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}
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} else {
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CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat && isLoadSS);
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CanFold = canFoldMemoryOperand(MI, Ops, DefIsReMat && isLoad);
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}
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} else
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CanFold = false;
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