vp8 fast quantizer with intrinsics

Reduce dependency on offsets file by using intrinsics. Disassembly shows
improvements over previous assembly specifically in register management,
preloading, and {pro,epi}log. Speed change is within margin of error.

Change-Id: I8131b4b4d62bc092407fe847bfaa8f2c0e1384ff

1 files changed, 103 insertions, 0 deletions

diff --git a/vp8/encoder/x86/quantize_sse2.c b/vp8/encoder/x86/quantize_sse2.c
new file mode 100644
index 000000000..55d57ad62
--- /dev/null
+++ b/vp8/encoder/x86/quantize_sse2.c
@@ -0,0 +1,103 @@
+/*
+ *  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 "vp8/common/blockd.h"
+#include "vp8/common/entropy.h"
+#include "vp8/encoder/block.h"
+
+#include <mmintrin.h> //MMX
+#include <xmmintrin.h> //SSE
+#include <emmintrin.h> //SSE2
+
+void vp8_fast_quantize_b_sse2(BLOCK *b, BLOCKD *d)
+{
+  __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 inv_zig_zag0 = _mm_load_si128((const __m128i *)(vp8_default_inv_zig_zag));
+  __m128i inv_zig_zag1 = _mm_load_si128((const __m128i *)(vp8_default_inv_zig_zag + 8));
+
+  __m128i sz0, sz1, x0, x1, y0, y1, xdq0, xdq1, zeros, ones;
+
+  /* sign of z: z >> 15 */
+  sz0 = _mm_srai_epi16(z0, 15);
+  sz1 = _mm_srai_epi16(z1, 15);
+
+  /* x = abs(z): (z ^ sz) - sz */
+  x0 = _mm_xor_si128(z0, sz0);
+  x1 = _mm_xor_si128(z1, sz1);
+  x0 = _mm_sub_epi16(x0, sz0);
+  x1 = _mm_sub_epi16(x1, sz1);
+
+  /* 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);
+
+  /* x = abs(y) = (y ^ sz) - sz */
+  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 */
+  xdq0 = _mm_mullo_epi16(x0, dequant0);
+  xdq1 = _mm_mullo_epi16(x1, dequant1);
+
+  /* dqcoeff = x * dequant */
+  _mm_store_si128((__m128i *)(d->dqcoeff), xdq0);
+  _mm_store_si128((__m128i *)(d->dqcoeff + 8), xdq1);
+
+  /* build a mask for the zig zag */
+  zeros = _mm_setzero_si128();
+
+  x0 = _mm_cmpeq_epi16(x0, zeros);
+  x1 = _mm_cmpeq_epi16(x1, zeros);
+
+  ones = _mm_cmpeq_epi16(zeros, zeros);
+
+  x0 = _mm_xor_si128(x0, ones);
+  x1 = _mm_xor_si128(x1, ones);
+
+  x0 = _mm_and_si128(x0, inv_zig_zag0);
+  x1 = _mm_and_si128(x1, inv_zig_zag1);
+
+  x0 = _mm_max_epi16(x0, x1);
+
+  /* now down to 8 */
+  x1 = _mm_shuffle_epi32(x0, 0xE); // 0b00001110
+
+  x0 = _mm_max_epi16(x0, x1);
+
+  /* only 4 left */
+  x1 = _mm_shufflelo_epi16(x0, 0xE); // 0b00001110
+
+  x0 = _mm_max_epi16(x0, x1);
+
+  /* okay, just 2! */
+  x1 = _mm_shufflelo_epi16(x0, 0x1); // 0b00000001
+
+  x0 = _mm_max_epi16(x0, x1);
+
+  *d->eob = 0xFF & _mm_cvtsi128_si32(x0);
+}