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Re: Help with implementing Wine optimization experiment

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.


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