diff options
Diffstat (limited to 'media/libvpx/libvpx/vp8/encoder/x86/vp8_quantize_ssse3.c')
-rw-r--r-- | media/libvpx/libvpx/vp8/encoder/x86/vp8_quantize_ssse3.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/encoder/x86/vp8_quantize_ssse3.c b/media/libvpx/libvpx/vp8/encoder/x86/vp8_quantize_ssse3.c new file mode 100644 index 0000000000..f6df146f08 --- /dev/null +++ b/media/libvpx/libvpx/vp8/encoder/x86/vp8_quantize_ssse3.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2012 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#include <tmmintrin.h> /* SSSE3 */ + +#include "./vp8_rtcd.h" +#include "vp8/encoder/block.h" +#include "vpx_ports/bitops.h" /* get_msb */ + +void vp8_fast_quantize_b_ssse3(BLOCK *b, BLOCKD *d) { + int eob, mask; + + __m128i z0 = _mm_load_si128((__m128i *)(b->coeff)); + __m128i z1 = _mm_load_si128((__m128i *)(b->coeff + 8)); + __m128i round0 = _mm_load_si128((__m128i *)(b->round)); + __m128i round1 = _mm_load_si128((__m128i *)(b->round + 8)); + __m128i quant_fast0 = _mm_load_si128((__m128i *)(b->quant_fast)); + __m128i quant_fast1 = _mm_load_si128((__m128i *)(b->quant_fast + 8)); + __m128i dequant0 = _mm_load_si128((__m128i *)(d->dequant)); + __m128i dequant1 = _mm_load_si128((__m128i *)(d->dequant + 8)); + + __m128i sz0, sz1, x, x0, x1, y0, y1, zeros, abs0, abs1; + + DECLARE_ALIGNED(16, const uint8_t, + pshufb_zig_zag_mask[16]) = { 0, 1, 4, 8, 5, 2, 3, 6, + 9, 12, 13, 10, 7, 11, 14, 15 }; + __m128i zig_zag = _mm_load_si128((const __m128i *)pshufb_zig_zag_mask); + + /* sign of z: z >> 15 */ + sz0 = _mm_srai_epi16(z0, 15); + sz1 = _mm_srai_epi16(z1, 15); + + /* x = abs(z) */ + x0 = _mm_abs_epi16(z0); + x1 = _mm_abs_epi16(z1); + + /* x += round */ + x0 = _mm_add_epi16(x0, round0); + x1 = _mm_add_epi16(x1, round1); + + /* y = (x * quant) >> 16 */ + y0 = _mm_mulhi_epi16(x0, quant_fast0); + y1 = _mm_mulhi_epi16(x1, quant_fast1); + + /* ASM saves Y for EOB */ + /* I think we can ignore that because adding the sign doesn't change anything + * and multiplying 0 by dequant is OK as well */ + abs0 = y0; + abs1 = y1; + + /* Restore the sign bit. */ + y0 = _mm_xor_si128(y0, sz0); + y1 = _mm_xor_si128(y1, sz1); + x0 = _mm_sub_epi16(y0, sz0); + x1 = _mm_sub_epi16(y1, sz1); + + /* qcoeff = x */ + _mm_store_si128((__m128i *)(d->qcoeff), x0); + _mm_store_si128((__m128i *)(d->qcoeff + 8), x1); + + /* x * dequant */ + x0 = _mm_mullo_epi16(x0, dequant0); + x1 = _mm_mullo_epi16(x1, dequant1); + + /* dqcoeff = x * dequant */ + _mm_store_si128((__m128i *)(d->dqcoeff), x0); + _mm_store_si128((__m128i *)(d->dqcoeff + 8), x1); + + zeros = _mm_setzero_si128(); + + x0 = _mm_cmpgt_epi16(abs0, zeros); + x1 = _mm_cmpgt_epi16(abs1, zeros); + + x = _mm_packs_epi16(x0, x1); + + x = _mm_shuffle_epi8(x, zig_zag); + + mask = _mm_movemask_epi8(x); + + /* x2 is needed to increase the result from non-zero masks by 1, + * +1 is needed to mask undefined behavior for a null argument, + * the result of get_msb(1) is 0 */ + eob = get_msb(mask * 2 + 1); + + *d->eob = eob; +} |