libvpx: Pull from upstream

source/libvpx/vp9/encoder/x86/vp9_dct_ssse3.c

 /*
  *  Copyright (c) 2014 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.
  */
 
@@ skipping 275 matching lines @@
   }
 
   iscan_ptr += n_coeffs;
   qcoeff_ptr += n_coeffs;
   dqcoeff_ptr += n_coeffs;
   n_coeffs = -n_coeffs;
   zero = _mm_setzero_si128();
 
   if (!skip_block) {
     __m128i eob;
-    __m128i round, quant, dequant;
+    __m128i round, quant, dequant, thr;
+    int16_t nzflag;
     {
       __m128i coeff0, coeff1;
 
       // Setup global values
       {
         round = _mm_load_si128((const __m128i*)round_ptr);
         quant = _mm_load_si128((const __m128i*)quant_ptr);
         dequant = _mm_load_si128((const __m128i*)dequant_ptr);
       }
 
@@ skipping 54 matching lines @@
         iscan1 = _mm_sub_epi16(iscan1, nzero_coeff1);
         eob = _mm_and_si128(iscan0, nzero_coeff0);
         eob1 = _mm_and_si128(iscan1, nzero_coeff1);
         eob = _mm_max_epi16(eob, eob1);
       }
       n_coeffs += 8 * 2;
     }
 
     // AC only loop
     index = 2;
+    thr = _mm_srai_epi16(dequant, 1);
     while (n_coeffs < 0) {
       __m128i coeff0, coeff1;
       {
         __m128i coeff0_sign, coeff1_sign;
         __m128i qcoeff0, qcoeff1;
         __m128i qtmp0, qtmp1;
 
         assert(index < (int)(sizeof(in) / sizeof(in[0])) - 1);
         coeff0 = *in[index];
         coeff1 = *in[index + 1];
 
         // Poor man's sign extract
         coeff0_sign = _mm_srai_epi16(coeff0, 15);
         coeff1_sign = _mm_srai_epi16(coeff1, 15);
         qcoeff0 = _mm_xor_si128(coeff0, coeff0_sign);
         qcoeff1 = _mm_xor_si128(coeff1, coeff1_sign);
         qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
         qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
 
-        qcoeff0 = _mm_adds_epi16(qcoeff0, round);
-        qcoeff1 = _mm_adds_epi16(qcoeff1, round);
-        qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
-        qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);
+        nzflag = _mm_movemask_epi8(_mm_cmpgt_epi16(qcoeff0, thr)) |
+            _mm_movemask_epi8(_mm_cmpgt_epi16(qcoeff1, thr));
 
-        // Reinsert signs
-        qcoeff0 = _mm_xor_si128(qtmp0, coeff0_sign);
-        qcoeff1 = _mm_xor_si128(qtmp1, coeff1_sign);
-        qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
-        qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
+        if (nzflag) {
+          qcoeff0 = _mm_adds_epi16(qcoeff0, round);
+          qcoeff1 = _mm_adds_epi16(qcoeff1, round);
+          qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
+          qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);
 
-        _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs), qcoeff0);
-        _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs) + 1, qcoeff1);
+          // Reinsert signs
+          qcoeff0 = _mm_xor_si128(qtmp0, coeff0_sign);
+          qcoeff1 = _mm_xor_si128(qtmp1, coeff1_sign);
+          qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
+          qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
 
-        coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
-        coeff1 = _mm_mullo_epi16(qcoeff1, dequant);
+          _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs), qcoeff0);
+          _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs) + 1, qcoeff1);
 
-        _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs), coeff0);
-        _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs) + 1, coeff1);
+          coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
+          coeff1 = _mm_mullo_epi16(qcoeff1, dequant);
+
+          _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs), coeff0);
+          _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs) + 1, coeff1);
+        } else {
+          _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs), zero);
+          _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs) + 1, zero);
+
+          _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs), zero);
+          _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs) + 1, zero);
+        }
       }
 
-      {
+      if (nzflag) {
         // Scan for eob
         __m128i zero_coeff0, zero_coeff1;
         __m128i nzero_coeff0, nzero_coeff1;
         __m128i iscan0, iscan1;
         __m128i eob0, eob1;
         zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
         zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
         nzero_coeff0 = _mm_cmpeq_epi16(zero_coeff0, zero);
         nzero_coeff1 = _mm_cmpeq_epi16(zero_coeff1, zero);
         iscan0 = _mm_load_si128((const __m128i*)(iscan_ptr + n_coeffs));
@@ skipping 25 matching lines @@
     do {
       _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs), zero);
       _mm_store_si128((__m128i*)(dqcoeff_ptr + n_coeffs) + 1, zero);
       _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs), zero);
       _mm_store_si128((__m128i*)(qcoeff_ptr + n_coeffs) + 1, zero);
       n_coeffs += 8 * 2;
     } while (n_coeffs < 0);
     *eob_ptr = 0;
   }
 }