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Only trim a live interval if the register is not used after the PHI node.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54421 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -896,13 +896,16 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
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}
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} else {
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// Trim live intervals of input registers. They are no longer live into
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// this block.
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// this block if they died after the PHI. If they lived after it, don't
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// trim them because they might have other legitimate uses.
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for (unsigned i = 1; i < PInstr->getNumOperands(); i += 2) {
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unsigned reg = PInstr->getOperand(i).getReg();
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MachineBasicBlock* MBB = PInstr->getOperand(i+1).getMBB();
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LiveInterval& InputI = LI.getInterval(reg);
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if (MBB != PInstr->getParent() &&
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InputI.liveAt(LI.getMBBStartIdx(PInstr->getParent())))
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InputI.liveAt(LI.getMBBStartIdx(PInstr->getParent())) &&
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InputI.expiredAt(LI.getInstructionIndex(PInstr) +
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LiveIntervals::InstrSlots::NUM))
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InputI.removeRange(LI.getMBBStartIdx(PInstr->getParent()),
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LI.getInstructionIndex(PInstr),
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true);
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