gfx/2d/SSEHelpers.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include <xmmintrin.h>
   6 #include <emmintrin.h>
   7
   8 /* Before Nehalem _mm_loadu_si128 could be very slow, this trick is a little
   9  * faster. Once enough people are on architectures where _mm_loadu_si128 is
  10  * fast we can migrate to it.
  11  */
  12 MOZ_ALWAYS_INLINE __m128i loadUnaligned128(const __m128i *aSource)
  13 {
  14   // Yes! We use uninitialized memory here, we'll overwrite it though!
  15   __m128 res = _mm_loadl_pi(_mm_set1_ps(0), (const __m64*)aSource);
  16   return _mm_castps_si128(_mm_loadh_pi(res, ((const __m64*)(aSource)) + 1));
  17 }