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Minor optimization in SSE4 unpremultiply

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Use a more direct conversion to desired unpacked format.

Change-Id: I47e4a31c580f294c4e717850c4a420e16214e0a9
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Allan Sandfeld Jensen 2015-02-23 14:34:11 +01:00
parent a09e67c2f7
commit d49b2f700f
1 changed files with 1 additions and 2 deletions
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3
src/gui/painting/qdrawingprimitive_sse2_p.h
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@ -245,8 +245,7 @@ inline QRgb qUnpremultiply_sse4(QRgb p)
const uint invAlpha = qt_inv_premul_factor[alpha];
const __m128i via = _mm_set1_epi32(invAlpha);
const __m128i vr = _mm_set1_epi32(0x8000);
__m128i vl = _mm_unpacklo_epi8(_mm_cvtsi32_si128(p), _mm_setzero_si128());
vl = _mm_unpacklo_epi16(vl, _mm_setzero_si128());
__m128i vl = _mm_cvtepu8_epi32(_mm_cvtsi32_si128(p));
vl = _mm_mullo_epi32(vl, via);
vl = _mm_add_epi32(vl, vr);
vl = _mm_srai_epi32(vl, 16);