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VSX Version of SAD8xN

VSX versions of the SAD functions of width 8.

SADTest Speed Test (POWER8 Model 2.1)
8x4  C time = 68.7 ms (±0.3 ms), VSX time = 31.8 ms (±0.1 ms) [2.2x]
8x8  C time = 55.6 ms (±0.3 ms), VSX time = 18.3 ms (±0.1 ms) [3.0x]
8x16 C time = 46.5 ms (±0.1 ms), VSX time = 15.6 ms (±0.1 ms) [3.0x]

Change-Id: I843f3b34e103b72deeade4a939193d8b53cee460

--- a/test/sad_test.cc

+++ b/test/sad_test.cc

@@ -1021,6 +1021,9 @@

   SadMxNParam(16, 32, &vpx_sad16x32_vsx),

   SadMxNParam(16, 16, &vpx_sad16x16_vsx),

   SadMxNParam(16, 8, &vpx_sad16x8_vsx),

+  SadMxNParam(8, 16, &vpx_sad8x16_vsx),

+  SadMxNParam(8, 8, &vpx_sad8x8_vsx),

+  SadMxNParam(8, 4, &vpx_sad8x4_vsx),

 };

 INSTANTIATE_TEST_CASE_P(VSX, SADTest, ::testing::ValuesIn(vsx_tests));

--- a/vpx_dsp/ppc/sad_vsx.c

+++ b/vpx_dsp/ppc/sad_vsx.c

@@ -31,6 +31,28 @@

   v_sad = vec_sum4s(v_absh, v_sad); \

   v_sad = vec_sum4s(v_absl, v_sad);

+#define SAD8(height)                                                     \

+  unsigned int vpx_sad8x##height##_vsx(const uint8_t *a, int a_stride,   \

+                                       const uint8_t *b, int b_stride) { \

+    int y = 0;                                                           \

+    uint8x16_t v_a, v_b, v_abs;                                          \

+    uint32x4_t v_sad = vec_zeros_u32;                                    \

+                                                                         \

+    do {                                                                 \

+      v_a = vec_vsx_ld(0, a);                                            \

+      v_b = vec_vsx_ld(0, b);                                            \

+                                                                         \

+      v_abs = vec_sub(vec_max(v_a, v_b), vec_min(v_a, v_b));             \

+      v_sad = vec_sum4s(v_abs, v_sad);                                   \

+                                                                         \

+      a += a_stride;                                                     \

+      b += b_stride;                                                     \

+      y++;                                                               \

+    } while (y < height);                                                \

+                                                                         \

+    return v_sad[1] + v_sad[0];                                          \

+  }

+

 #define SAD16(height)                                                     \

   unsigned int vpx_sad16x##height##_vsx(const uint8_t *a, int a_stride,   \

                                         const uint8_t *b, int b_stride) { \

@@ -95,6 +117,9 @@

     return sad[3] + sad[2] + sad[1] + sad[0];                             \

   }

+SAD8(4);

+SAD8(8);

+SAD8(16);

 SAD16(8);

 SAD16(16);

 SAD16(32);

--- a/vpx_dsp/ppc/types_vsx.h

+++ b/vpx_dsp/ppc/types_vsx.h

@@ -82,6 +82,7 @@

 static const uint16x8_t vec_ones_u16 = { 1, 1, 1, 1, 1, 1, 1, 1 };

 static const uint32x4_t vec_ones_u32 = { 1, 1, 1, 1 };

 static const int32x4_t vec_zeros_s32 = { 0, 0, 0, 0 };

+static const uint32x4_t vec_zeros_u32 = { 0, 0, 0, 0 };

 static const uint16x8_t vec_shift_sign_s16 = { 15, 15, 15, 15, 15, 15, 15, 15 };

 static const uint32x4_t vec_shift_sign_s32 = { 31, 31, 31, 31 };

 static const uint8x16_t vec_perm64 = { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,

--- a/vpx_dsp/vpx_dsp_rtcd_defs.pl

+++ b/vpx_dsp/vpx_dsp_rtcd_defs.pl

@@ -748,13 +748,13 @@

 specialize qw/vpx_sad16x8 neon msa sse2 vsx mmi/;

 add_proto qw/unsigned int vpx_sad8x16/, "const uint8_t *src_ptr, int src_stride, const uint8_t *ref_ptr, int ref_stride";

-specialize qw/vpx_sad8x16 neon msa sse2 mmi/;

+specialize qw/vpx_sad8x16 neon msa sse2 vsx mmi/;

 add_proto qw/unsigned int vpx_sad8x8/, "const uint8_t *src_ptr, int src_stride, const uint8_t *ref_ptr, int ref_stride";

-specialize qw/vpx_sad8x8 neon msa sse2 mmi/;

+specialize qw/vpx_sad8x8 neon msa sse2 vsx mmi/;

 add_proto qw/unsigned int vpx_sad8x4/, "const uint8_t *src_ptr, int src_stride, const uint8_t *ref_ptr, int ref_stride";

-specialize qw/vpx_sad8x4 neon msa sse2 mmi/;

+specialize qw/vpx_sad8x4 neon msa sse2 vsx mmi/;

 add_proto qw/unsigned int vpx_sad4x8/, "const uint8_t *src_ptr, int src_stride, const uint8_t *ref_ptr, int ref_stride";

 specialize qw/vpx_sad4x8 neon msa sse2 mmi/;