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[common] fixed framebuffer write SIMD code performance

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This commit is contained in:
Geoffrey McRae 2020-08-03 11:44:24 +10:00
parent da655b86c3
commit 2329e993ee
1 changed files with 8 additions and 4 deletions
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12
common/src/framebuffer.c
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@ -111,21 +111,25 @@ void framebuffer_prepare(FrameBuffer * frame)
bool framebuffer_write(FrameBuffer * frame, const void * src, size_t size)
{
__m128i * s = (__m128i *)src;
size_t wp = 0;
/* copy in chunks */
while(size > 15)
{
_mm_stream_si128((__m128i *)(frame->data + frame->wp), _mm_load_si128(s));
atomic_fetch_add_explicit(&frame->wp, 16, memory_order_release);
++s;
_mm_stream_si128((__m128i *)(frame->data + wp), _mm_loadu_si128(s++));
size -= 16;
wp += 16;
if (wp % FB_CHUNK_SIZE == 0)
atomic_store_explicit(&frame->wp, wp, memory_order_release);
}
if(size)
{
memcpy(frame->data + frame->wp, s, size);
atomic_fetch_add_explicit(&frame->wp, size, memory_order_release);
wp += size;
}
atomic_store_explicit(&frame->wp, wp, memory_order_release);
return true;
}