[aarch64-port-dev ] [RFC] ldp/stp peephole optimizations

[Zhongwei Yao]

OK, I'll give a try doing it in MacroAssembler.

On 26 December 2017 at 18:13, Andrew Haley <aph at redhat.com> wrote:
> On 26/12/17 04:24, Zhongwei Yao wrote:
>> I was also thinking about merging it in assembler. My concern was that
>> assembler usually does not do optimisation.
>>
>> However, I've taken a quick check and I think it should be doable in
>> assembler. For example, we can merge ldr in assembler's ldr instruct
>> definition by checking if the previous instruct meets the constraints.
>> For the previous instruction, we can record it in Instruction_aarch64
>> class's destructor (if it is ld/st instruction, record it. if not,
>> clear it.).
>>
>> What do you think? If it is OK, I'll work out a prototype for merging
>> ldr in assembler.
>
> Try doing it in MacroAssembler.  MacroAssembler::membar is an example of
> where we already merge instructions.
>
> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671



-- 
Best regards,
Zhongwei