diff options
| author | Elliott Hughes <enh@google.com> | 2010-02-24 16:36:18 -0800 |
|---|---|---|
| committer | Elliott Hughes <enh@google.com> | 2010-02-24 16:36:18 -0800 |
| commit | b4c05977c28c38d2f81b48d0cb15559dc3d05564 (patch) | |
| tree | b40cc2cc302a088b931eb97bdc0fd6997d96f41f /vm/compiler/codegen/arm/ArmLIR.h | |
| parent | 88a0f970e47dc0091d2c9965aa9bd06667e5f4b7 (diff) | |
Optimize more easy multiplications by constants.
Rather than make these changes in the libraries (*10 being a common case),
let's do them once and for all in the JIT.
The 2^n-1 case could be better if we generated RSB instructions, but the
current "fake" RSB is still better than a full multiply.
Thumb doesn't support reg/reg/reg/shift instructions, so we can't optimize
the "population count <= 2" cases (such as *10) there.
Tested on sholes, passion, and passion-running-sapphire (and visually
inspected to check we weren't trying to generate Thumb2 instructions there).
Also tested with the self-verifier.
Diffstat (limited to 'vm/compiler/codegen/arm/ArmLIR.h')
| -rw-r--r-- | vm/compiler/codegen/arm/ArmLIR.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/vm/compiler/codegen/arm/ArmLIR.h b/vm/compiler/codegen/arm/ArmLIR.h index b329aedb7..7d262215e 100644 --- a/vm/compiler/codegen/arm/ArmLIR.h +++ b/vm/compiler/codegen/arm/ArmLIR.h @@ -706,7 +706,7 @@ extern ArmEncodingMap EncodingMap[kArmLast]; /* * Each instance of this struct holds a pseudo or real LIR instruction: - * - pesudo ones (eg labels and marks) and will be discarded by the assembler. + * - pseudo ones (eg labels and marks) and will be discarded by the assembler. * - real ones will be assembled into Thumb instructions. * * Machine resources are encoded into a 64-bit vector, where the encodings are |