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| author | Evan Cheng <evan.cheng@apple.com> | 2011-01-20 08:34:58 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2011-01-20 08:34:58 +0000 |
| commit | 9fe2009956fc40f3aea46fb3c38dcfb61c4aca46 (patch) | |
| tree | fe7f9182beb36b75873546f190e5a2caa6b49a14 /lib/Target/ARM/ARMScheduleA8.td | |
| parent | 59315d1d54de6d9a8d721542c9ae251a00cff1ed (diff) | |
| download | llvm-9fe2009956fc40f3aea46fb3c38dcfb61c4aca46.tar.gz llvm-9fe2009956fc40f3aea46fb3c38dcfb61c4aca46.tar.bz2 llvm-9fe2009956fc40f3aea46fb3c38dcfb61c4aca46.tar.xz | |
Sorry, several patches in one.
TargetInstrInfo:
Change produceSameValue() to take MachineRegisterInfo as an optional argument.
When in SSA form, targets can use it to make more aggressive equality analysis.
Machine LICM:
1. Eliminate isLoadFromConstantMemory, use MI.isInvariantLoad instead.
2. Fix a bug which prevent CSE of instructions which are not re-materializable.
3. Use improved form of produceSameValue.
ARM:
1. Teach ARM produceSameValue to look pass some PIC labels.
2. Look for operands from different loads of different constant pool entries
which have same values.
3. Re-implement PIC GA materialization using movw + movt. Combine the pair with
a "add pc" or "ldr [pc]" to form pseudo instructions. This makes it possible
to re-materialize the instruction, allow machine LICM to hoist the set of
instructions out of the loop and make it possible to CSE them. It's a bit
hacky, but it significantly improve code quality.
4. Some minor bug fixes as well.
With the fixes, using movw + movt to materialize GAs significantly outperform the
load from constantpool method. 186.crafty and 255.vortex improved > 20%, 254.gap
and 176.gcc ~10%.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123905 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/ARM/ARMScheduleA8.td')
| -rw-r--r-- | lib/Target/ARM/ARMScheduleA8.td | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/ARM/ARMScheduleA8.td b/lib/Target/ARM/ARMScheduleA8.td index 33ba683828..8d86c01dc7 100644 --- a/lib/Target/ARM/ARMScheduleA8.td +++ b/lib/Target/ARM/ARMScheduleA8.td @@ -71,6 +71,12 @@ def CortexA8Itineraries : ProcessorItineraries< InstrItinData<IIC_iMOVsr, [InstrStage<1, [A8_Pipe0, A8_Pipe1]>], [1, 1, 1]>, InstrItinData<IIC_iMOVix2,[InstrStage<1, [A8_Pipe0, A8_Pipe1]>, InstrStage<1, [A8_Pipe0, A8_Pipe1]>], [2]>, + InstrItinData<IIC_iMOVix2addpc,[InstrStage<1, [A8_Pipe0, A8_Pipe1]>, + InstrStage<1, [A8_Pipe0, A8_Pipe1]>, + InstrStage<1, [A8_Pipe0, A8_Pipe1]>], [3]>, + InstrItinData<IIC_iMOVix2ld,[InstrStage<1, [A8_Pipe0, A8_Pipe1]>, + InstrStage<1, [A8_Pipe0, A8_Pipe1]>, + InstrStage<1, [A8_LSPipe]>], [5]>, // // Move instructions, conditional InstrItinData<IIC_iCMOVi , [InstrStage<1, [A8_Pipe0, A8_Pipe1]>], [2]>, |