SSEHelpers.h (848B)
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 }