Attachment 24789 Details for Bug 21173 – SSE2-ify fbFetch_a8()

[patch] SSE2-ify fbFetch_a8()

fbFetch_a8-sse2.patch (text/plain), 1.93 KB, created by Steve Snyder on 2009-04-14 07:57:27 UTC

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Creator: Steve Snyder

Created: 2009-04-14 07:57:27 UTC

Size: 1.93 KB

patch

obsolete

>--- mozilla/gfx/cairo/libpixman/src/pixman-access.c.original	2009-04-14 07:26:21.000000000 -0400
>+++ mozilla/gfx/cairo/libpixman/src/pixman-access.c	2009-04-14 10:32:23.000000000 -0400
>@@ -403,10 +403,55 @@
> fbFetch_a8 (bits_image_t *pict, int x, int y, int width, uint32_t *buffer)
> {
>     const uint32_t *bits = pict->bits + y*pict->rowstride;
>     const uint8_t *pixel = (const uint8_t *)bits + x;
>     const uint8_t *end = pixel + width;
>+
>+#ifdef _USE_ALPHA_COPY_SSE2_
>+    // align dest pointer
>+    while ( width && ((unsigned)buffer & 15) )
>+    {
>+        width--;
>+        *buffer++ = READ(pict, pixel++) << 24;
>+    }
>+
>+    // bulk read-shift-write
>+    if ( (width >= 16) && !((unsigned)buffer & 15) )
>+    {
>+        __m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6;
>+        const __m128i xmm7 = _mm_setzero_si128();
>+
>+        while (width >= 16)
>+        {
>+            xmm0 = _mm_loadu_si128((__m128i *)pixel);
>+            width  -= 16;
>+            pixel  += 16;
>+
>+            xmm1 = _mm_load_si128(&xmm7);
>+            xmm2 = _mm_load_si128(&xmm7);
>+            xmm1 = _mm_unpacklo_epi8(xmm1, xmm0);
>+            xmm2 = _mm_unpackhi_epi8(xmm2, xmm0);
>+
>+            xmm3 = _mm_load_si128(&xmm7);
>+            xmm4 = _mm_load_si128(&xmm7);
>+            xmm5 = _mm_load_si128(&xmm7);
>+            xmm6 = _mm_load_si128(&xmm7);
>+
>+            xmm3 = _mm_unpacklo_epi16(xmm3, xmm1);
>+            xmm4 = _mm_unpackhi_epi16(xmm4, xmm1);
>+            xmm5 = _mm_unpacklo_epi16(xmm5, xmm2);
>+            xmm6 = _mm_unpackhi_epi16(xmm6, xmm2);
>+
>+            _mm_store_si128( ((__m128i *)&buffer[ 0]), xmm3 );
>+            _mm_store_si128( ((__m128i *)&buffer[ 4]), xmm4 );
>+            _mm_store_si128( ((__m128i *)&buffer[ 8]), xmm5 );
>+            _mm_store_si128( ((__m128i *)&buffer[12]), xmm6 );
>+            buffer += 16;
>+        }
>+    }
>+#endif // _USE_ALPHA_COPY_SSE2_
>+
>     while (pixel < end) {
> 	*buffer++ = READ(pict, pixel++) << 24;
>     }
> }
>

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