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[AArch64] Minor code refactoring. NFC.

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llvm-svn: 293063
This commit is contained in:
Chad Rosier 2017-01-25 15:56:59 +00:00
parent e063c39b33
commit d7569c2c65
1 changed files with 10 additions and 9 deletions
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19
lib/Target/AArch64/AArch64RedundantCopyElimination.cpp
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@ -70,14 +70,10 @@ static bool guaranteesZeroRegInBlock(MachineInstr &MI, MachineBasicBlock *MBB) {
unsigned Opc = MI.getOpcode();
// Check if the current basic block is the target block to which the
// CBZ/CBNZ instruction jumps when its Wt/Xt is zero.
if ((Opc == AArch64::CBZW || Opc == AArch64::CBZX) &&
MBB == MI.getOperand(1).getMBB())
return true;
else if ((Opc == AArch64::CBNZW || Opc == AArch64::CBNZX) &&
MBB != MI.getOperand(1).getMBB())
return true;
return false;
return ((Opc == AArch64::CBZW || Opc == AArch64::CBZX) &&
MBB == MI.getOperand(1).getMBB()) ||
((Opc == AArch64::CBNZW || Opc == AArch64::CBNZX) &&
MBB != MI.getOperand(1).getMBB());
}
bool AArch64RedundantCopyElimination::optimizeCopy(MachineBasicBlock *MBB) {
@ -85,9 +81,14 @@ bool AArch64RedundantCopyElimination::optimizeCopy(MachineBasicBlock *MBB) {
if (MBB->pred_size() != 1)
return false;
// Check if the predecessor has two successors, implying the block ends in a
// conditional branch.
MachineBasicBlock *PredMBB = *MBB->pred_begin();
if (PredMBB->succ_size() != 2)
return false;
MachineBasicBlock::iterator CompBr = PredMBB->getLastNonDebugInstr();
if (CompBr == PredMBB->end() || PredMBB->succ_size() != 2)
if (CompBr == PredMBB->end())
return false;
++CompBr;