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mesa/streaming-memcpy: add memcpy fallback 

this makes it more compatible and able to be used from the caller without ifdefs

Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16732>
This commit is contained in:
Mike Blumenkrantz 2022-06-02 09:56:11 -04:00 committed by Marge Bot
parent 03e8908e27
commit c370fa362b
1 changed files with 7 additions and 3 deletions
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10
src/mesa/main/streaming-load-memcpy.c
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@ -28,7 +28,10 @@
#include "main/macros.h"
#include "main/streaming-load-memcpy.h"
#include "x86/common_x86_asm.h"
#ifdef USE_SSE41
#include <smmintrin.h>
#endif
/* Copies memory from src to dst, using SSE 4.1's MOVNTDQA to get streaming
* read performance from uncached memory.
@ -39,8 +42,9 @@ _mesa_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len)
char *restrict d = dst;
char *restrict s = src;
/* If dst and src are not co-aligned, fallback to memcpy(). */
if (((uintptr_t)d & 15) != ((uintptr_t)s & 15)) {
#ifdef USE_SSE41
/* If dst and src are not co-aligned, or if SSE4.1 is not present, fallback to memcpy(). */
if (((uintptr_t)d & 15) != ((uintptr_t)s & 15) || !cpu_has_sse4_1) {
memcpy(d, s, len);
return;
}
@ -80,7 +84,7 @@ _mesa_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len)
s += 64;
len -= 64;
}
#endif
/* memcpy() the tail. */
if (len) {
memcpy(d, s, len);