Attachment 22370 Details for Bug 60883 – Исправленный исходник, проблема с FPS исчезает - проверено.

Исправленный исходник, проблема с FPS исчезает - проверено.

fastmemcpy.c (text/x-csrc), 1.49 KB, created by mail on 2026-10-09 10:09:17 MSK

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Creator: mail

Created: 2026-10-09 10:09:17 MSK

Size: 1.49 KB

patch

obsolete

>/* ÐÐ¸Ð½Ð¸Ð¼Ð°Ð»ÑÐ½Ð°Ñ LD_PRELOAD-Ð·Ð°Ð¼ÐµÐ½Ð° memcpy/memmove Ð´Ð»Ñ 32-Ð±Ð¸ÑÐ½ÑÑ Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð² (Ð´Ð¸Ð°Ð³Ð½Ð¾ÑÑÐ¸ÐºÐ°).
> *
> * ÐÐ°Ð¿Ð¸ÑÑ Ð¸Ð´ÑÑ ÑÐµÑÐµÐ· "rep movsb" Ð¸ Ð¿ÑÐ¸ÑÐ¼Ð½Ð¸Ðº Ð¿ÐµÑÐµÐ´ Ð·Ð°Ð¿Ð¸ÑÑÑ Ð½Ðµ ÑÐ¸ÑÐ°ÐµÑÑÑ.
> * ÐÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð°, ÑÑÐ¾Ð±Ñ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÑ: Ð·Ð°Ð¼ÐµÐ½Ð° ÑÐ¾Ð»ÑÐºÐ¾ memcpy/memmove Ð½Ð° Ð½Ð°ÑÐ¸Ð²Ð½Ð¾Ð¹ ALT p11
> * (i586-glibc-core 2.38.0.223.f053ff-alt1.p11.1) Ð²Ð¾Ð·Ð²ÑÐ°ÑÐ°ÐµÑ FPS Ð½Ð°ÑÐ¸Ð²Ð½Ð¾Ð¹
> * Half-Life 2 Ñ 20-30 Ð´Ð¾ 180 Ð² "ÑÑÐ¶ÑÐ»Ð¾Ð¹" ÑÑÐµÐ½Ðµ, Ð±ÐµÐ· Ð´ÑÑÐ³Ð¸Ñ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ð¹.
> * ÐÑÐ¾ Ð½Ðµ Ð¸ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ glibc Ð¸ Ð½Ðµ Ð¾Ð¿ÑÐ¸Ð¼Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ð½Ð°Ñ ÑÐµÐ°Ð»Ð¸Ð·Ð°ÑÐ¸Ñ (Ð½ÐµÑ memset Ð¸ Ð´Ñ.).
> *
> * Ð¡Ð±Ð¾ÑÐºÐ°:
> *   gcc -m32 -O2 -shared -fPIC -fno-builtin -fno-tree-loop-distribute-patterns \
> *       -fno-stack-protector -o libfastmemcpy.so fastmemcpy.c
> * ÐÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ðµ (Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÑ Ð·Ð°Ð¿ÑÑÐºÐ° Steam-Ð¸Ð³ÑÑ):
> *   LD_PRELOAD=/Ð¿ÑÑÑ/libfastmemcpy.so %command%
> */
>#include <stddef.h>
>
>void *memcpy(void *restrict d, const void *restrict s, size_t n) {
>    void *r = d;
>    __asm__ volatile("cld; rep movsb" : "+D"(d), "+S"(s), "+c"(n) : : "memory");
>    return r;
>}
>
>void *memmove(void *d, const void *s, size_t n) {
>    unsigned char *dd = d; const unsigned char *ss = s;
>    if (dd <= ss || dd >= ss + n) { return memcpy(d, s, n); }
>    while (n >= 4) { n -= 4; *(unsigned int *)(dd + n) = *(const unsigned int *)(ss + n); }
>    while (n) { n--; dd[n] = ss[n]; }
>    return d;
>}

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Attachments on bug 60883: 22370 | 22376