The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/2d/SSEHelpers.h	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,17 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +#include <xmmintrin.h>
     1.9 +#include <emmintrin.h>
    1.10 +
    1.11 +/* Before Nehalem _mm_loadu_si128 could be very slow, this trick is a little
    1.12 + * faster. Once enough people are on architectures where _mm_loadu_si128 is
    1.13 + * fast we can migrate to it.
    1.14 + */
    1.15 +MOZ_ALWAYS_INLINE __m128i loadUnaligned128(const __m128i *aSource)
    1.16 +{
    1.17 +  // Yes! We use uninitialized memory here, we'll overwrite it though!
    1.18 +  __m128 res = _mm_loadl_pi(_mm_set1_ps(0), (const __m64*)aSource);
    1.19 +  return _mm_castps_si128(_mm_loadh_pi(res, ((const __m64*)(aSource)) + 1));
    1.20 +}