diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2009-07-27 04:18:04 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-07-27 04:18:04 +0000 |
| commit | 1f5c9887544ac2cb39d48e35cc6fa7a7b73ed3b0 (patch) | |
| tree | ae653265d57ea987c9a9b793c744202214a23f59 | |
| parent | 5732ca084aaa0cd26149e50dd4b487efff37fe41 (diff) | |
If CPSR is modified but the def is dead, then it's ok to fold the load / store.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77182 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/ARM/ARMBaseInstrInfo.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp index 2d1a5a8f6e..9f3edc7228 100644 --- a/lib/Target/ARM/ARMBaseInstrInfo.cpp +++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp @@ -681,7 +681,7 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, MachineInstr *NewMI = NULL; if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) { // If it is updating CPSR, then it cannot be folded. - if (MI->getOperand(4).getReg() != ARM::CPSR) { + if (MI->getOperand(4).getReg() != ARM::CPSR || MI->getOperand(4).isDead()) { unsigned Pred = MI->getOperand(2).getImm(); unsigned PredReg = MI->getOperand(3).getReg(); if (OpNum == 0) { // move -> store @@ -771,6 +771,7 @@ ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF, MachineInstr* MI, const SmallVectorImpl<unsigned> &Ops, MachineInstr* LoadMI) const { + // FIXME return 0; } @@ -782,7 +783,7 @@ ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI, unsigned Opc = MI->getOpcode(); if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) { // If it is updating CPSR, then it cannot be folded. - return MI->getOperand(4).getReg() != ARM::CPSR; + return MI->getOperand(4).getReg() != ARM::CPSR ||MI->getOperand(4).isDead(); } else if (Opc == ARM::FCPYS || Opc == ARM::FCPYD) { return true; } else if (Opc == ARM::VMOVD || Opc == ARM::VMOVQ) { |