quantize ssse3: copy style from sse2

Change-Id: I53f8a160e640c674ea035fc112e207b6dca42598

vpx_dsp/x86/quantize_ssse3.c

@@ -23,104 +23,88 @@ void vpx_quantize_b_ssse3(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
                           const int16_t *dequant_ptr, uint16_t *eob_ptr,
                           const int16_t *scan_ptr, const int16_t *iscan_ptr) {
   const __m128i zero = _mm_setzero_si128();
+  intptr_t index = 16;
+
+  __m128i zbin, round, quant, dequant, shift;
   __m128i coeff0, coeff1;
-  __m128i eob;
-  __m128i zbin;
-  __m128i round, quant, dequant, shift;
-  intptr_t index = 0;
+  __m128i qcoeff0, qcoeff1;
+  __m128i cmp_mask0, cmp_mask1;
+  __m128i qtmp0, qtmp1;
+  __m128i zero_coeff0, zero_coeff1, iscan0, iscan1;
+  __m128i eob, eob0, eob1;
+
   (void)scan_ptr;
   (void)skip_block;
   assert(!skip_block);
 
-  // Setup global values
-  {
-    const __m128i one = _mm_set1_epi16(1);
-    zbin = _mm_load_si128((const __m128i *)zbin_ptr);
-    // x86 has no "greater *or equal* comparison. Subtract 1 from zbin so
-    // it is a strict "greater" comparison.
-    zbin = _mm_sub_epi16(zbin, one);
-    round = _mm_load_si128((const __m128i *)round_ptr);
-    quant = _mm_load_si128((const __m128i *)quant_ptr);
-    dequant = _mm_load_si128((const __m128i *)dequant_ptr);
-    shift = _mm_load_si128((const __m128i *)quant_shift_ptr);
-  }
-
-  {
-    __m128i qcoeff0, qcoeff1;
-    __m128i qtmp0, qtmp1;
-    __m128i cmp_mask0, cmp_mask1;
-    __m128i zero_coeff0, zero_coeff1;
-    __m128i iscan0, iscan1;
-    __m128i eob1;
-
-    // Do DC and first 15 AC
-    coeff0 = load_tran_low(coeff_ptr + index);
-    coeff1 = load_tran_low(coeff_ptr + index + 8);
-
-    qcoeff0 = _mm_abs_epi16(coeff0);
-    qcoeff1 = _mm_abs_epi16(coeff1);
-
-    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);
-    // Overwrite DC component.
-    zbin = _mm_unpackhi_epi64(zbin, zbin);
-    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);
-
-    qcoeff0 = _mm_adds_epi16(qcoeff0, round);
-    round = _mm_unpackhi_epi64(round, round);
-    qcoeff1 = _mm_adds_epi16(qcoeff1, round);
-
-    qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
-    quant = _mm_unpackhi_epi64(quant, quant);
-    qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);
-
-    qtmp0 = _mm_add_epi16(qtmp0, qcoeff0);
-    qtmp1 = _mm_add_epi16(qtmp1, qcoeff1);
-
-    qcoeff0 = _mm_mulhi_epi16(qtmp0, shift);
-    shift = _mm_unpackhi_epi64(shift, shift);
-    qcoeff1 = _mm_mulhi_epi16(qtmp1, shift);
-
-    // Reinsert signs
-    qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);
-    qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);
-
-    // Mask out zbin threshold coeffs
-    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
-    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);
-
-    store_tran_low(qcoeff0, qcoeff_ptr + index);
-    store_tran_low(qcoeff1, qcoeff_ptr + index + 8);
-
-    coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
-    dequant = _mm_unpackhi_epi64(dequant, dequant);
-    coeff1 = _mm_mullo_epi16(qcoeff1, dequant);
-
-    store_tran_low(coeff0, dqcoeff_ptr + index);
-    store_tran_low(coeff1, dqcoeff_ptr + index + 8);
-
-    // Scan for eob
-    zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
-    zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
-    iscan0 = _mm_load_si128((const __m128i *)(iscan_ptr + index));
-    iscan1 = _mm_load_si128((const __m128i *)(iscan_ptr + index + 8));
-    // Add one to convert from indices to counts
-    iscan0 = _mm_sub_epi16(iscan0, cmp_mask0);
-    iscan1 = _mm_sub_epi16(iscan1, cmp_mask1);
-    eob = _mm_andnot_si128(zero_coeff0, iscan0);
-    eob1 = _mm_andnot_si128(zero_coeff1, iscan1);
-    eob = _mm_max_epi16(eob, eob1);
-  }
-  index += 16;
-
-  // AC only loop
+  // Setup global values.
+  zbin = _mm_load_si128((const __m128i *)zbin_ptr);
+  // x86 has no "greater *or equal* comparison. Subtract 1 from zbin so
+  // it is a strict "greater" comparison.
+  zbin = _mm_sub_epi16(zbin, _mm_set1_epi16(1));
+  round = _mm_load_si128((const __m128i *)round_ptr);
+  quant = _mm_load_si128((const __m128i *)quant_ptr);
+  dequant = _mm_load_si128((const __m128i *)dequant_ptr);
+  shift = _mm_load_si128((const __m128i *)quant_shift_ptr);
+
+  // Do DC and first 15 AC.
+  coeff0 = load_tran_low(coeff_ptr);
+  coeff1 = load_tran_low(coeff_ptr + 8);
+
+  qcoeff0 = _mm_abs_epi16(coeff0);
+  qcoeff1 = _mm_abs_epi16(coeff1);
+
+  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);
+  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC
+  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);
+
+  qcoeff0 = _mm_adds_epi16(qcoeff0, round);
+  round = _mm_unpackhi_epi64(round, round);
+  qcoeff1 = _mm_adds_epi16(qcoeff1, round);
+
+  qtmp0 = _mm_mulhi_epi16(qcoeff0, quant);
+  quant = _mm_unpackhi_epi64(quant, quant);
+  qtmp1 = _mm_mulhi_epi16(qcoeff1, quant);
+
+  qtmp0 = _mm_add_epi16(qtmp0, qcoeff0);
+  qtmp1 = _mm_add_epi16(qtmp1, qcoeff1);
+
+  qcoeff0 = _mm_mulhi_epi16(qtmp0, shift);
+  shift = _mm_unpackhi_epi64(shift, shift);
+  qcoeff1 = _mm_mulhi_epi16(qtmp1, shift);
+
+  // Reinsert signs
+  qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);
+  qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);
+
+  // Mask out zbin threshold coeffs
+  qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
+  qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);
+
+  store_tran_low(qcoeff0, qcoeff_ptr);
+  store_tran_low(qcoeff1, qcoeff_ptr + 8);
+
+  coeff0 = _mm_mullo_epi16(qcoeff0, dequant);
+  dequant = _mm_unpackhi_epi64(dequant, dequant);
+  coeff1 = _mm_mullo_epi16(qcoeff1, dequant);
+
+  store_tran_low(coeff0, dqcoeff_ptr);
+  store_tran_low(coeff1, dqcoeff_ptr + 8);
+
+  // Scan for eob.
+  zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
+  zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
+  iscan0 = _mm_load_si128((const __m128i *)(iscan_ptr));
+  iscan1 = _mm_load_si128((const __m128i *)(iscan_ptr + 8));
+  // Add one to convert from indices to counts
+  iscan0 = _mm_sub_epi16(iscan0, cmp_mask0);
+  iscan1 = _mm_sub_epi16(iscan1, cmp_mask1);
+  eob = _mm_andnot_si128(zero_coeff0, iscan0);
+  eob1 = _mm_andnot_si128(zero_coeff1, iscan1);
+  eob = _mm_max_epi16(eob, eob1);
+
+  // AC only loop.
   while (index < n_coeffs) {
-    __m128i qcoeff0, qcoeff1;
-    __m128i qtmp0, qtmp1;
-    __m128i cmp_mask0, cmp_mask1;
-    __m128i zero_coeff0, zero_coeff1;
-    __m128i iscan0, iscan1;
-    __m128i eob0, eob1;
-
     coeff0 = load_tran_low(coeff_ptr + index);
     coeff1 = load_tran_low(coeff_ptr + index + 8);
 
@@ -142,11 +126,9 @@ void vpx_quantize_b_ssse3(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
     qcoeff0 = _mm_mulhi_epi16(qtmp0, shift);
     qcoeff1 = _mm_mulhi_epi16(qtmp1, shift);
 
-    // Reinsert signs
     qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);
     qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);
 
-    // Mask out zbin threshold coeffs
     qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
     qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);
 
@@ -159,12 +141,10 @@ void vpx_quantize_b_ssse3(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
     store_tran_low(coeff0, dqcoeff_ptr + index);
     store_tran_low(coeff1, dqcoeff_ptr + index + 8);
 
-    // Scan for eob
     zero_coeff0 = _mm_cmpeq_epi16(coeff0, zero);
     zero_coeff1 = _mm_cmpeq_epi16(coeff1, zero);
     iscan0 = _mm_load_si128((const __m128i *)(iscan_ptr + index));
     iscan1 = _mm_load_si128((const __m128i *)(iscan_ptr + index + 8));
-    // Add one to convert from indices to counts
     iscan0 = _mm_sub_epi16(iscan0, cmp_mask0);
     iscan1 = _mm_sub_epi16(iscan1, cmp_mask1);
     eob0 = _mm_andnot_si128(zero_coeff0, iscan0);
@@ -175,7 +155,7 @@ void vpx_quantize_b_ssse3(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
     index += 16;
   }
 
-  // Accumulate EOB
+  // Accumulate eob.
   {
     __m128i eob_shuffled;
     eob_shuffled = _mm_shuffle_epi32(eob, 0xe);