gfx/2d/SSEHelpers.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include <xmmintrin.h>
   8 #include <emmintrin.h>
   9
  10 /* Before Nehalem _mm_loadu_si128 could be very slow, this trick is a little
  11  * faster. Once enough people are on architectures where _mm_loadu_si128 is
  12  * fast we can migrate to it.
  13  */
  14 MOZ_ALWAYS_INLINE __m128i loadUnaligned128(const __m128i* aSource) {
  15   // Yes! We use uninitialized memory here, we'll overwrite it though!
  16   __m128 res = _mm_loadl_pi(_mm_set1_ps(0), (const __m64*)aSource);
  17   return _mm_castps_si128(_mm_loadh_pi(res, ((const __m64*)(aSource)) + 1));
  18 }