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Re: Help with implementing Wine optimization experiment

From: Florian Weimer <fweimer at redhat dot com>
To: Daniel Santos <daniel dot santos at pobox dot com>, gcc <gcc at gcc dot gnu dot org>
Date: Mon, 15 Aug 2016 12:46:58 +0200
Subject: Re: Help with implementing Wine optimization experiment
Authentication-results: sourceware.org; auth=none
References: <af89a465-e41f-e560-b27e-8c1e65cceb6a@pobox.com>

On 08/14/2016 08:23 AM, Daniel Santos wrote:


ms_abi_push_regs:
    pop    %rax
    push   %rdi
    push   %rsi
    sub    $0xa8,%rsp
    movaps %xmm6,(%rsp)
    movaps %xmm7,0x10(%rsp)
    movaps %xmm8,0x20(%rsp)
    movaps %xmm9,0x30(%rsp)
    movaps %xmm10,0x40(%rsp)
    movaps %xmm11,0x50(%rsp)
    movaps %xmm12,0x60(%rsp)
    movaps %xmm13,0x70(%rsp)
    movaps %xmm14,0x80(%rsp)
    movaps %xmm15,0x90(%rsp)
    jmp   *(%rax)

I think this will be quite slow because it breaks the return stackoptimization in the CPU. I think you should push the return address anduse RET.


Florian

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