SSE2 high precision 32x32 forward DCT

Enable SSE2 implementation of high precision 32x32 forward DCT. The
intermediate stacks are of 32-bits. The run-time goes down from
32126 cycles to 13442 cycles.

Change-Id: Ib5ccafe3176c65bd6f2dbdef790bd47bbc880e56

vp9/common/vp9_blockd.h

@@ -143,7 +143,7 @@ typedef struct {
   unsigned char mb_skip_coeff;                                /* does this mb has coefficients at all, 1=no coefficients, 0=need decode tokens */
   unsigned char segment_id;           // Segment id for current frame
 
-  // Flags used for prediction status of various bistream signals
+  // Flags used for prediction status of various bit-stream signals
   unsigned char seg_id_predicted;
 
   // Indicates if the mb is part of the image (1) vs border (0)

vp9/common/vp9_idct.h

@@ -27,6 +27,9 @@
 #define pair_set_epi16(a, b) \
   _mm_set1_epi32(((uint16_t)(a)) + (((uint16_t)(b)) << 16))
 
+#define pair_set_epi32(a, b) \
+  _mm_set_epi32(b, a, b, a)
+
 // Constants:
 //  for (int i = 1; i< 32; ++i)
 //    printf("static const int cospi_%d_64 = %.0f;\n", i,

vp9/common/vp9_rtcd_defs.sh

@@ -740,7 +740,7 @@ prototype void vp9_short_fdct8x4 "int16_t *InputData, int16_t *OutputData, int p
 specialize vp9_short_fdct8x4 sse2
 
 prototype void vp9_short_fdct32x32 "int16_t *InputData, int16_t *OutputData, int pitch"
-specialize vp9_short_fdct32x32
+specialize vp9_short_fdct32x32 sse2
 
 prototype void vp9_short_fdct32x32_rd "int16_t *InputData, int16_t *OutputData, int pitch"
 specialize vp9_short_fdct32x32_rd sse2

vp9/encoder/vp9_rdopt.c

@@ -8,7 +8,6 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-
 #include <stdio.h>
 #include <math.h>
 #include <limits.h>

vp9/encoder/x86/vp9_dct_sse2.c

@@ -2573,13 +2573,13 @@ void vp9_short_fht16x16_sse2(int16_t *input, int16_t *output,
 }
 
 #define FDCT32x32_2D vp9_short_fdct32x32_rd_sse2
-#define FDCT32x32_LOW_PRECISION 1
+#define FDCT32x32_HIGH_PRECISION 0
 #include "vp9/encoder/x86/vp9_dct32x32_sse2.c"
 #undef  FDCT32x32_2D
-#undef  FDCT32x32_LOW_PRECISION
+#undef  FDCT32x32_HIGH_PRECISION
 
 #define FDCT32x32_2D vp9_short_fdct32x32_sse2
-#define FDCT32x32_LOW_PRECISION 0
+#define FDCT32x32_HIGH_PRECISION 1
 #include "vp9/encoder/x86/vp9_dct32x32_sse2.c" // NOLINT
 #undef  FDCT32x32_2D
-#undef  FDCT32x32_LOW_PRECISION
+#undef  FDCT32x32_HIGH_PRECISION