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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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17
gfx/2d/SSEHelpers.h Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <xmmintrin.h>
#include <emmintrin.h>
/* Before Nehalem _mm_loadu_si128 could be very slow, this trick is a little
* faster. Once enough people are on architectures where _mm_loadu_si128 is
* fast we can migrate to it.
*/
MOZ_ALWAYS_INLINE __m128i loadUnaligned128(const __m128i *aSource)
{
// Yes! We use uninitialized memory here, we'll overwrite it though!
__m128 res = _mm_loadl_pi(_mm_set1_ps(0), (const __m64*)aSource);
return _mm_castps_si128(_mm_loadh_pi(res, ((const __m64*)(aSource)) + 1));
}