shithub: libvpx

Download patch

ref: 58245d7050d7ea4433f8c1965d229d623f0dd4b7
parent: 6b4a65e8b149e1eaa246ebf80b0887f388c9d378
author: Luca Barbato <lu_zero@gentoo.org>
date: Sun Apr 9 09:05:09 EDT 2017 

ppc: dc predictor 8x8

Slightly faster, the other dc predictors cannot be faster since
the computation speedup is overwhelmed by the time spent reading
dst to write just the 8x8 part.

Change-Id: I94a0b50500adf8b7b6bb919dbf5c7adf5b9fba66


--- a/test/test_intra_pred_speed.cc
+++ b/test/test_intra_pred_speed.cc
@@ -313,9 +313,9 @@
 #endif  // HAVE_MSA
 
 #if HAVE_VSX
-INTRA_PRED_TEST(VSX, TestIntraPred8, NULL, NULL, NULL, NULL, NULL, NULL,
-                vpx_d45_predictor_8x8_vsx, NULL, NULL, NULL, NULL, NULL,
-                vpx_tm_predictor_8x8_vsx)
+INTRA_PRED_TEST(VSX, TestIntraPred8, vpx_dc_predictor_8x8_vsx, NULL, NULL, NULL,
+                NULL, NULL, vpx_d45_predictor_8x8_vsx, NULL, NULL, NULL, NULL,
+                NULL, vpx_tm_predictor_8x8_vsx)
 
 INTRA_PRED_TEST(VSX, TestIntraPred16, vpx_dc_predictor_16x16_vsx,
                 vpx_dc_left_predictor_16x16_vsx, vpx_dc_top_predictor_16x16_vsx,
--- a/vpx_dsp/ppc/intrapred_vsx.c
+++ b/vpx_dsp/ppc/intrapred_vsx.c
@@ -362,6 +362,16 @@
   tm_predictor_32x8(dst, stride, unpack_to_s16_l(l1), a0, a1, tl);
 }
 
+static INLINE void dc_fill_predictor_8x8(uint8_t *dst, const ptrdiff_t stride,
+                                         const uint8x16_t val) {
+  int i;
+
+  for (i = 0; i < 8; i++, dst += stride) {
+    const uint8x16_t d = vec_vsx_ld(0, dst);
+    vec_vsx_st(xxpermdi(val, d, 1), 0, dst);
+  }
+}
+
 static INLINE void dc_fill_predictor_16x16(uint8_t *dst, const ptrdiff_t stride,
                                            const uint8x16_t val) {
   int i;
@@ -452,6 +462,19 @@
   dc_fill_predictor_32x32(dst, stride, avg32(above));
 }
 
+static uint8x16_t dc_avg8(const uint8_t *above, const uint8_t *left) {
+  const uint8x16_t a0 = vec_vsx_ld(0, above);
+  const uint8x16_t l0 = vec_vsx_ld(0, left);
+  const int32x4_t sum4s =
+      (int32x4_t)vec_sum4s(l0, vec_sum4s(a0, vec_splat_u32(0)));
+  const int32x4_t sum4s8 = xxpermdi(sum4s, vec_splat_s32(0), 1);
+  const uint32x4_t sum = (uint32x4_t)vec_sums(sum4s8, vec_splat_s32(8));
+  const uint32x4_t avg = (uint32x4_t)vec_sr(sum, vec_splat_u32(4));
+
+  return vec_splat(vec_pack(vec_pack(avg, vec_splat_u32(0)), vec_splat_u16(0)),
+                   3);
+}
+
 static uint8x16_t dc_avg16(const uint8_t *above, const uint8_t *left) {
   const uint8x16_t a0 = vec_vsx_ld(0, above);
   const uint8x16_t l0 = vec_vsx_ld(0, left);
@@ -463,6 +486,11 @@
 
   return vec_splat(vec_pack(vec_pack(avg, vec_splat_u32(0)), vec_splat_u16(0)),
                    3);
+}
+
+void vpx_dc_predictor_8x8_vsx(uint8_t *dst, ptrdiff_t stride,
+                              const uint8_t *above, const uint8_t *left) {
+  dc_fill_predictor_8x8(dst, stride, dc_avg8(above, left));
 }
 
 void vpx_dc_predictor_16x16_vsx(uint8_t *dst, ptrdiff_t stride,
--- a/vpx_dsp/vpx_dsp_rtcd_defs.pl
+++ b/vpx_dsp/vpx_dsp_rtcd_defs.pl
@@ -98,7 +98,7 @@
 specialize qw/vpx_tm_predictor_8x8 neon dspr2 msa sse2 vsx/;
 
 add_proto qw/void vpx_dc_predictor_8x8/, "uint8_t *dst, ptrdiff_t y_stride, const uint8_t *above, const uint8_t *left";
-specialize qw/vpx_dc_predictor_8x8 dspr2 neon msa sse2/;
+specialize qw/vpx_dc_predictor_8x8 dspr2 neon msa sse2 vsx/;
 
 add_proto qw/void vpx_dc_top_predictor_8x8/, "uint8_t *dst, ptrdiff_t y_stride, const uint8_t *above, const uint8_t *left";
 specialize qw/vpx_dc_top_predictor_8x8 neon msa sse2/;