diff options
| author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2017-03-27 17:31:56 +0000 |
|---|---|---|
| committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2017-03-27 17:31:56 +0000 |
| commit | 97874bddd63328616c18a0e8230f6732c02ba3ba (patch) | |
| tree | ebf127d9321954cc2567f7108769c17b06f24fbc /lib/Target/AArch64/AArch64InstructionSelector.cpp | |
| parent | db6b71ba7954fad8e37a9c53ec84de95c3ae177e (diff) | |
[GlobalISel][AArch64] Fold FI into LDR/STR ui addressing mode.
A majority of loads and stores at O0 access an alloca.
It's trivial to fold the G_FRAME_INDEX into the instruction; do it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298864 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/AArch64/AArch64InstructionSelector.cpp')
| -rw-r--r-- | lib/Target/AArch64/AArch64InstructionSelector.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/AArch64/AArch64InstructionSelector.cpp b/lib/Target/AArch64/AArch64InstructionSelector.cpp index be0f6eb44d1..70c11c125ef 100644 --- a/lib/Target/AArch64/AArch64InstructionSelector.cpp +++ b/lib/Target/AArch64/AArch64InstructionSelector.cpp @@ -792,6 +792,11 @@ bool AArch64InstructionSelector::select(MachineInstr &I) const { } } + // If we haven't folded anything into our addressing mode yet, try to fold + // a frame index into the base+offset. + if (!Offset && PtrMI->getOpcode() == TargetOpcode::G_FRAME_INDEX) + I.getOperand(1).ChangeToFrameIndex(PtrMI->getOperand(1).getIndex()); + I.addOperand(MachineOperand::CreateImm(Offset)); // If we're storing a 0, use WZR/XZR. |