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llmvpipe: improve mm_mullo_epi32

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Apply Jose's suggestions for a small but measurable improvement in
isosurf.
This commit is contained in:
José Fonseca
2010-10-12 14:15:59 +01:00
committed by Keith Whitwell
parent b6b7ce84e5
commit e3ec0fdd54
1 changed files with 3 additions and 4 deletions
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src/gallium/drivers/llvmpipe/lp_rast_tri.c
+3 -4
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@@ -321,8 +321,8 @@ transpose4_epi32(const __m128i * restrict a,
*/
static INLINE __m128i mm_mullo_epi32(const __m128i a, const __m128i b)
{
__m128i a4 = _mm_srli_si128(a, 4); /* shift by one dword */
__m128i b4 = _mm_srli_si128(b, 4); /* shift by one dword */
__m128i a4 = _mm_srli_epi64(a, 32); /* shift by one dword */
__m128i b4 = _mm_srli_epi64(b, 32); /* shift by one dword */
__m128i ba = _mm_mul_epu32(b, a); /* multply dwords 0, 2 */
__m128i b4a4 = _mm_mul_epu32(b4, a4); /* multiply dwords 1, 3 */
@@ -336,8 +336,7 @@ static INLINE __m128i mm_mullo_epi32(const __m128i a, const __m128i b)
#else
__m128i mask = _mm_setr_epi32(~0,0,~0,0);
__m128i ba_mask = _mm_and_si128(ba, mask);
__m128i b4a4_mask = _mm_and_si128(b4a4, mask);
__m128i b4a4_mask_shift = _mm_slli_si128(b4a4_mask, 4);
__m128i b4a4_mask_shift = _mm_slli_epi64(b4a4, 32);
__m128i result = _mm_or_si128(ba_mask, b4a4_mask_shift);
#endif