Re: Help with implementing Wine optimization experiment

[Jeff Law <law@redhat.com>]

On 08/14/2016 01:57 AM, Trevor Saunders wrote:
> On Sun, Aug 14, 2016 at 01:23:16AM -0500, Daniel Santos wrote:
>> I'm experimenting with ways to optimize wine (x86 target only) and I believe
>> I can shrink wine's total text size by around 7% by outlining the lengthy
>> pro- and epilogues required for ms_abi functions making sysv_abi calls.
>> Theoretically, fewer instruction cache misses will offset the extra 4
>> instructions per function and result in a net performance gain. However, I'm
>> new to the gcc project and a novice x86 assembly programmer as well (have
>> been wanting to work on gcc for a while now!) In short, I want to:
>>
>> 1. Replace the prologue that pushes di, sp and xmm6-15 with a single call to
>> a global "ms_abi_push_regs" routine
>> 2. Replace the epilogue that pops these regs with a jmp to a global
>> "ms_abi_pop_regs" routine
>> 3. Add the two routines somewhere so that they are linked into the output.
>
> I think you want to put those into libgcc then.
Right.  That's what I've done with out-of-line prologues/epilogues in 
the past.

Jeff