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[A57FPLoadBalancing] Ignore <def>s when checking if a chain may be killed.

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Defs are seen before uses, so a def without the kill flag doesn't necessarily
mean that the register is not killed on that instruction. It may be killed
in a later use operand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217689 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy 2014-09-12 16:55:26 +00:00
parent c919e57cbf
commit b4fbcbc288
1 changed files with 4 additions and 0 deletions
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lib/Target/AArch64/AArch64A57FPLoadBalancing.cpp
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@ -662,6 +662,10 @@ maybeKillChain(MachineOperand &MO, unsigned Idx,
// determine if a chain should be ended and remove from ActiveChains.
MachineInstr *MI = MO.getParent();
if (MO.isReg() && MO.isDef())
// We don't care about defs. We see them before uses, so reject them early.
return;
if (MO.isReg()) {
// If this is a KILL of a current chain, record it.