Commit 327a02d7 authored by Johann's avatar Johann Committed by Johann Koenig

Use 'packssdw' for loading tran_low_t values

This matches bitdepth_conversion_sse2.asm and produces substantially
better assembly. The old way had lots of 'movzwl' and 'shl' and storing
back to memory before loading into an xmm register.

Change-Id: Ib33e35354dfd691a4f8b1e39f4dbcbb14cd5302b
parent 9c2bb7f3
......@@ -16,13 +16,12 @@
#include "vpx/vpx_integer.h"
#include "vpx_dsp/vpx_dsp_common.h"
// Load 8 16 bit values. If the source is 32 bits then cast down.
// This does not saturate values. It only truncates.
// Load 8 16 bit values. If the source is 32 bits then pack down with
// saturation.
static INLINE __m128i load_tran_low(const tran_low_t *a) {
#if CONFIG_VP9_HIGHBITDEPTH
return _mm_setr_epi16((int16_t)a[0], (int16_t)a[1], (int16_t)a[2],
(int16_t)a[3], (int16_t)a[4], (int16_t)a[5],
(int16_t)a[6], (int16_t)a[7]);
const __m128i a_low = _mm_load_si128((const __m128i *)a);
return _mm_packs_epi32(a_low, *(const __m128i *)(a + 4));
#else
return _mm_load_si128((const __m128i *)a);
#endif
......
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