shithub: libvpx

Download patch

ref: c5443fc8810593fbc2456de0c75dd6061c5ab576
parent: 94103308937ec7118cce82bbd776f282b0eca584
author: Yunqing Wang <yunqingwang@google.com>
date: Fri May 23 07:52:20 EDT 2014 

Fix decoder mismatch in sub-pixel SSSE3 intrinsic filters

In 8-tap filtering, to guarantee the intermediate results fit in
16 bits, the order of accumulating the products needs to be done
correctly, and the largest product should be added last. This
patch fixed the problem using the method in commit "Correct ssse3
8/16-pixel wide sub-pixel filter calculation".

Change-Id: I79d0ad60c057b15011ece84cda9648eee0809423


--- a/vp9/common/x86/vp9_asm_stubs.c
+++ b/vp9/common/x86/vp9_asm_stubs.c
@@ -192,6 +192,19 @@
 FUN_CONV_2D(, avx2);
 #endif
 #if HAVE_SSSE3
+#if (ARCH_X86_64)
+filter8_1dfunction vp9_filter_block1d16_v8_intrin_ssse3;
+filter8_1dfunction vp9_filter_block1d16_h8_intrin_ssse3;
+filter8_1dfunction vp9_filter_block1d8_v8_intrin_ssse3;
+filter8_1dfunction vp9_filter_block1d8_h8_intrin_ssse3;
+filter8_1dfunction vp9_filter_block1d4_v8_ssse3;
+filter8_1dfunction vp9_filter_block1d4_h8_intrin_ssse3;
+#define vp9_filter_block1d16_v8_ssse3 vp9_filter_block1d16_v8_intrin_ssse3
+#define vp9_filter_block1d16_h8_ssse3 vp9_filter_block1d16_h8_intrin_ssse3
+#define vp9_filter_block1d8_v8_ssse3 vp9_filter_block1d8_v8_intrin_ssse3
+#define vp9_filter_block1d8_h8_ssse3 vp9_filter_block1d8_h8_intrin_ssse3
+#define vp9_filter_block1d4_h8_ssse3 vp9_filter_block1d4_h8_intrin_ssse3
+#else
 filter8_1dfunction vp9_filter_block1d16_v8_ssse3;
 filter8_1dfunction vp9_filter_block1d16_h8_ssse3;
 filter8_1dfunction vp9_filter_block1d8_v8_ssse3;
@@ -198,6 +211,7 @@
 filter8_1dfunction vp9_filter_block1d8_h8_ssse3;
 filter8_1dfunction vp9_filter_block1d4_v8_ssse3;
 filter8_1dfunction vp9_filter_block1d4_h8_ssse3;
+#endif
 filter8_1dfunction vp9_filter_block1d16_v8_avg_ssse3;
 filter8_1dfunction vp9_filter_block1d16_h8_avg_ssse3;
 filter8_1dfunction vp9_filter_block1d8_v8_avg_ssse3;
--- a/vp9/common/x86/vp9_subpixel_8t_intrin_ssse3.c
+++ b/vp9/common/x86/vp9_subpixel_8t_intrin_ssse3.c
@@ -44,7 +44,7 @@
                                          unsigned int output_pitch,
                                          unsigned int output_height,
                                          int16_t *filter) {
-  __m128i firstFilters, secondFilters, thirdFilters, forthFilters;
+  __m128i firstFilters, secondFilters, shuffle1, shuffle2;
   __m128i srcRegFilt1, srcRegFilt2, srcRegFilt3, srcRegFilt4;
   __m128i addFilterReg64, filtersReg, srcReg, minReg;
   unsigned int i;
@@ -61,20 +61,22 @@
   // duplicate only the third 16 bit in the filter into the first lane
   secondFilters = _mm_shufflelo_epi16(filtersReg, 0xAAu);
   // duplicate only the seconds 16 bits in the filter into the second lane
+  // firstFilters: k0 k1 k0 k1 k0 k1 k0 k1 k2 k3 k2 k3 k2 k3 k2 k3
   firstFilters = _mm_shufflehi_epi16(firstFilters, 0x55u);
   // duplicate only the forth 16 bits in the filter into the second lane
+  // secondFilters: k4 k5 k4 k5 k4 k5 k4 k5 k6 k7 k6 k7 k6 k7 k6 k7
   secondFilters = _mm_shufflehi_epi16(secondFilters, 0xFFu);
 
   // loading the local filters
-  thirdFilters =_mm_load_si128((__m128i const *)filt1_4_h8);
-  forthFilters = _mm_load_si128((__m128i const *)filt2_4_h8);
+  shuffle1 =_mm_load_si128((__m128i const *)filt1_4_h8);
+  shuffle2 = _mm_load_si128((__m128i const *)filt2_4_h8);
 
   for (i = 0; i < output_height; i++) {
     srcReg = _mm_loadu_si128((__m128i *)(src_ptr-3));
 
     // filter the source buffer
-    srcRegFilt1= _mm_shuffle_epi8(srcReg, thirdFilters);
-    srcRegFilt2= _mm_shuffle_epi8(srcReg, forthFilters);
+    srcRegFilt1= _mm_shuffle_epi8(srcReg, shuffle1);
+    srcRegFilt2= _mm_shuffle_epi8(srcReg, shuffle2);
 
     // multiply 2 adjacent elements with the filter and add the result
     srcRegFilt1 = _mm_maddubs_epi16(srcRegFilt1, firstFilters);
@@ -164,12 +166,12 @@
     srcRegFilt4 = _mm_maddubs_epi16(srcRegFilt4, forthFilters);
 
     // add and saturate all the results together
-    minReg = _mm_min_epi16(srcRegFilt4, srcRegFilt3);
-    srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, srcRegFilt2);
+    minReg = _mm_min_epi16(srcRegFilt2, srcRegFilt3);
+    srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, srcRegFilt4);
 
-    srcRegFilt4= _mm_max_epi16(srcRegFilt4, srcRegFilt3);
+    srcRegFilt2= _mm_max_epi16(srcRegFilt2, srcRegFilt3);
     srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, minReg);
-    srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, srcRegFilt4);
+    srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, srcRegFilt2);
     srcRegFilt1 = _mm_adds_epi16(srcRegFilt1, addFilterReg64);
 
     // shift by 7 bit each 16 bits
@@ -229,21 +231,21 @@
 
     // filter the source buffer
     srcRegFilt1_1= _mm_shuffle_epi8(srcReg1, filt1Reg);
-    srcRegFilt2= _mm_shuffle_epi8(srcReg1, filt2Reg);
+    srcRegFilt2= _mm_shuffle_epi8(srcReg1, filt4Reg);
 
     // multiply 2 adjacent elements with the filter and add the result
     srcRegFilt1_1 = _mm_maddubs_epi16(srcRegFilt1_1, firstFilters);
-    srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, secondFilters);
+    srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, forthFilters);
 
     // add and saturate the results together
     srcRegFilt1_1 = _mm_adds_epi16(srcRegFilt1_1, srcRegFilt2);
 
     // filter the source buffer
-    srcRegFilt3= _mm_shuffle_epi8(srcReg1, filt4Reg);
+    srcRegFilt3= _mm_shuffle_epi8(srcReg1, filt2Reg);
     srcRegFilt2= _mm_shuffle_epi8(srcReg1, filt3Reg);
 
     // multiply 2 adjacent elements with the filter and add the result
-    srcRegFilt3 = _mm_maddubs_epi16(srcRegFilt3, forthFilters);
+    srcRegFilt3 = _mm_maddubs_epi16(srcRegFilt3, secondFilters);
     srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, thirdFilters);
 
     // add and saturate the results together
@@ -260,21 +262,21 @@
 
     // filter the source buffer
     srcRegFilt2_1= _mm_shuffle_epi8(srcReg2, filt1Reg);
-    srcRegFilt2= _mm_shuffle_epi8(srcReg2, filt2Reg);
+    srcRegFilt2= _mm_shuffle_epi8(srcReg2, filt4Reg);
 
     // multiply 2 adjacent elements with the filter and add the result
     srcRegFilt2_1 = _mm_maddubs_epi16(srcRegFilt2_1, firstFilters);
-    srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, secondFilters);
+    srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, forthFilters);
 
     // add and saturate the results together
     srcRegFilt2_1 = _mm_adds_epi16(srcRegFilt2_1, srcRegFilt2);
 
     // filter the source buffer
-    srcRegFilt3= _mm_shuffle_epi8(srcReg2, filt4Reg);
+    srcRegFilt3= _mm_shuffle_epi8(srcReg2, filt2Reg);
     srcRegFilt2= _mm_shuffle_epi8(srcReg2, filt3Reg);
 
     // multiply 2 adjacent elements with the filter and add the result
-    srcRegFilt3 = _mm_maddubs_epi16(srcRegFilt3, forthFilters);
+    srcRegFilt3 = _mm_maddubs_epi16(srcRegFilt3, secondFilters);
     srcRegFilt2 = _mm_maddubs_epi16(srcRegFilt2, thirdFilters);
 
     // add and saturate the results together
-- 
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