shithub: libvpx

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ppc: d45 predictor 16x16

About 16x faster.

Change-Id: Ie5469fb32d5fd11bb6cb06318cea475d8a5b00b9

--- a/test/test_intra_pred_speed.cc

+++ b/test/test_intra_pred_speed.cc

@@ -319,8 +319,8 @@

 INTRA_PRED_TEST(VSX, TestIntraPred16, vpx_dc_predictor_16x16_vsx,

                 vpx_dc_left_predictor_16x16_vsx, vpx_dc_top_predictor_16x16_vsx,

                 vpx_dc_128_predictor_16x16_vsx, vpx_v_predictor_16x16_vsx,

-                vpx_h_predictor_16x16_vsx, NULL, NULL, NULL, NULL, NULL, NULL,

-                vpx_tm_predictor_16x16_vsx)

+                vpx_h_predictor_16x16_vsx, vpx_d45_predictor_16x16_vsx, NULL,

+                NULL, NULL, NULL, NULL, vpx_tm_predictor_16x16_vsx)

 INTRA_PRED_TEST(VSX, TestIntraPred32, vpx_dc_predictor_32x32_vsx,

                 vpx_dc_left_predictor_32x32_vsx, vpx_dc_top_predictor_32x32_vsx,

--- a/vpx_dsp/ppc/intrapred_vsx.c

+++ b/vpx_dsp/ppc/intrapred_vsx.c

@@ -489,3 +489,32 @@

                                 const uint8_t *above, const uint8_t *left) {

   dc_fill_predictor_32x32(dst, stride, dc_avg32(above, left));

 }

+

+static uint8x16_t avg3(const uint8x16_t a, const uint8x16_t b,

+                       const uint8x16_t c) {

+  const uint8x16_t ac =

+      vec_adds(vec_and(a, c), vec_sr(vec_xor(a, c), vec_splat_u8(1)));

+

+  return vec_avg(ac, b);

+}

+

+// Workaround vec_sld/vec_xxsldi/vec_lsdoi being missing or broken.

+static const uint8x16_t sl1 = { 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8,

+                                0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF, 0x10 };

+

+void vpx_d45_predictor_16x16_vsx(uint8_t *dst, ptrdiff_t stride,

+                                 const uint8_t *above, const uint8_t *left) {

+  const uint8x16_t a = vec_vsx_ld(0, above);

+  const uint8x16_t above_right = vec_splat(a, 15);

+  const uint8x16_t b = vec_perm(a, above_right, sl1);

+  const uint8x16_t c = vec_perm(b, above_right, sl1);

+  uint8x16_t row = avg3(a, b, c);

+  int i;

+  (void)left;

+

+  for (i = 0; i < 16; i++) {

+    vec_vsx_st(row, 0, dst);

+    dst += stride;

+    row = vec_perm(row, above_right, sl1);

+  }

+}

--- a/vpx_dsp/vpx_dsp_rtcd_defs.pl

+++ b/vpx_dsp/vpx_dsp_rtcd_defs.pl

@@ -113,7 +113,7 @@

 specialize qw/vpx_d207_predictor_16x16 ssse3/;

 add_proto qw/void vpx_d45_predictor_16x16/, "uint8_t *dst, ptrdiff_t y_stride, const uint8_t *above, const uint8_t *left";

-specialize qw/vpx_d45_predictor_16x16 neon ssse3/;

+specialize qw/vpx_d45_predictor_16x16 neon ssse3 vsx/;

 add_proto qw/void vpx_d63_predictor_16x16/, "uint8_t *dst, ptrdiff_t y_stride, const uint8_t *above, const uint8_t *left";

 specialize qw/vpx_d63_predictor_16x16 ssse3/;