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Added vp9_sad8x8_neon()

Change-Id: I3be8911121ef9a5f39f6c1a2e28f9e00972e0624

--- a/test/sad_test.cc

+++ b/test/sad_test.cc

@@ -475,10 +475,12 @@

 const SadMxNVp9Func sad_64x64_neon_vp9 = vp9_sad64x64_neon;

 const SadMxNVp9Func sad_32x32_neon_vp9 = vp9_sad32x32_neon;

 const SadMxNVp9Func sad_16x16_neon_vp9 = vp9_sad16x16_neon;

+const SadMxNVp9Func sad_8x8_neon_vp9 = vp9_sad8x8_neon;

 const SadMxNVp9Param neon_vp9_tests[] = {

   make_tuple(64, 64, sad_64x64_neon_vp9),

   make_tuple(32, 32, sad_32x32_neon_vp9),

   make_tuple(16, 16, sad_16x16_neon_vp9),

+  make_tuple(8, 8, sad_8x8_neon_vp9),

 };

 INSTANTIATE_TEST_CASE_P(NEON, SADVP9Test, ::testing::ValuesIn(neon_vp9_tests));

 #endif  // CONFIG_VP9_ENCODER

--- a/vp9/common/vp9_rtcd_defs.pl

+++ b/vp9/common/vp9_rtcd_defs.pl

@@ -554,7 +554,7 @@

 specialize qw/vp9_sad8x16 mmx/, "$sse2_x86inc";

 add_proto qw/unsigned int vp9_sad8x8/, "const uint8_t *src_ptr, int source_stride, const uint8_t *ref_ptr, int  ref_stride";

-specialize qw/vp9_sad8x8 mmx/, "$sse2_x86inc";

+specialize qw/vp9_sad8x8 mmx neon/, "$sse2_x86inc";

 add_proto qw/unsigned int vp9_sad8x4/, "const uint8_t *src_ptr, int source_stride, const uint8_t *ref_ptr, int ref_stride";

 specialize qw/vp9_sad8x4/, "$sse2_x86inc";

--- a/vp9/encoder/arm/neon/vp9_sad_neon.c

+++ b/vp9/encoder/arm/neon/vp9_sad_neon.c

@@ -26,9 +26,8 @@

                                 vreinterpret_u32_u64(vget_high_u64(b)));

   return vget_lane_u32(c, 0);

 }

-static INLINE unsigned int horizontal_add_16x8(const uint16x8_t vec_lo,

-                                               const uint16x8_t vec_hi) {

-  const uint32x4_t a = vpaddlq_u16(vaddq_u16(vec_lo, vec_hi));

+static INLINE unsigned int horizontal_add_16x8(const uint16x8_t vec_16x8) {

+  const uint32x4_t a = vpaddlq_u16(vec_16x8);

   const uint64x2_t b = vpaddlq_u32(a);

   const uint32x2_t c = vadd_u32(vreinterpret_u32_u64(vget_low_u64(b)),

                                 vreinterpret_u32_u64(vget_high_u64(b)));

@@ -93,7 +92,7 @@

     vec_accum_hi = vabal_u8(vec_accum_hi, vget_high_u8(vec_src_16),

                             vget_high_u8(vec_ref_16));

   }

-  return horizontal_add_16x8(vec_accum_lo, vec_accum_hi);

+  return horizontal_add_16x8(vaddq_u16(vec_accum_lo, vec_accum_hi));

 }

 unsigned int vp9_sad16x16_neon(const uint8_t *src, int src_stride,

@@ -112,5 +111,20 @@

     vec_accum_hi = vabal_u8(vec_accum_hi, vget_high_u8(vec_src),

                             vget_high_u8(vec_ref));

   }

-  return horizontal_add_16x8(vec_accum_lo, vec_accum_hi);

+  return horizontal_add_16x8(vaddq_u16(vec_accum_lo, vec_accum_hi));

+}

+

+unsigned int vp9_sad8x8_neon(const uint8_t *src, int src_stride,

+                             const uint8_t *ref, int ref_stride) {

+  int i;

+  uint16x8_t vec_accum = vdupq_n_u16(0);

+

+  for (i = 0; i < 8; ++i) {

+    const uint8x8_t vec_src = vld1_u8(src);

+    const uint8x8_t vec_ref = vld1_u8(ref);

+    src += src_stride;

+    ref += ref_stride;

+    vec_accum = vabal_u8(vec_accum, vec_src, vec_ref);

+  }

+  return horizontal_add_16x8(vec_accum);

 }

-- 

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