From: Linfeng Zhang <linfengz@google.com>
Date: Mon, 7 May 2018 19:46:14 +0000 (-0700)
Subject: Add vpx_sum_squares_2d_i16_neon()
X-Git-Tag: v1.8.0~710^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3a0f25ea3afa5a492507a36b4187ec5c03167c63;p=libvpx

Add vpx_sum_squares_2d_i16_neon()

Perf shows CPU time of this function dropped from 0.81% to 0.15%.

Change-Id: I8a7649ca5c15af2fc65cfb848f5befa0cc5e64f2
---

diff --git a/test/sum_squares_test.cc b/test/sum_squares_test.cc
index 910718b06..e211fb4d8 100644
--- a/test/sum_squares_test.cc
+++ b/test/sum_squares_test.cc
@@ -104,6 +104,13 @@ TEST_P(SumSquaresTest, ExtremeValues) {
 
 using ::testing::make_tuple;
 
+#if HAVE_NEON
+INSTANTIATE_TEST_CASE_P(
+    NEON, SumSquaresTest,
+    ::testing::Values(make_tuple(&vpx_sum_squares_2d_i16_c,
+                                 &vpx_sum_squares_2d_i16_neon)));
+#endif  // HAVE_NEON
+
 #if HAVE_SSE2
 INSTANTIATE_TEST_CASE_P(
     SSE2, SumSquaresTest,
diff --git a/vpx_dsp/arm/sum_squares_neon.c b/vpx_dsp/arm/sum_squares_neon.c
new file mode 100644
index 000000000..8942ba83b
--- /dev/null
+++ b/vpx_dsp/arm/sum_squares_neon.c
@@ -0,0 +1,85 @@
+/*
+ *  Copyright (c) 2018 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <arm_neon.h>
+
+#include <assert.h>
+#include "./vpx_dsp_rtcd.h"
+
+uint64_t vpx_sum_squares_2d_i16_neon(const int16_t *src, int stride, int size) {
+  int64x1_t s2;
+
+  if (size == 4) {
+    int16x4_t s[4];
+    int32x4_t s0;
+    uint32x2_t s1;
+
+    s[0] = vld1_s16(src + 0 * stride);
+    s[1] = vld1_s16(src + 1 * stride);
+    s[2] = vld1_s16(src + 2 * stride);
+    s[3] = vld1_s16(src + 3 * stride);
+    s0 = vmull_s16(s[0], s[0]);
+    s0 = vmlal_s16(s0, s[1], s[1]);
+    s0 = vmlal_s16(s0, s[2], s[2]);
+    s0 = vmlal_s16(s0, s[3], s[3]);
+    s1 = vpadd_u32(vget_low_u32(vreinterpretq_u32_s32(s0)),
+                   vget_high_u32(vreinterpretq_u32_s32(s0)));
+    s2 = vpaddl_u32(s1);
+  } else {
+    int r = size;
+    uint64x2_t s1 = vdupq_n_u64(0);
+
+    do {
+      int c = size;
+      int32x4_t s0 = vdupq_n_s32(0);
+      const int16_t *src_t = src;
+
+      do {
+        int16x8_t s[8];
+
+        s[0] = vld1q_s16(src_t + 0 * stride);
+        s[1] = vld1q_s16(src_t + 1 * stride);
+        s[2] = vld1q_s16(src_t + 2 * stride);
+        s[3] = vld1q_s16(src_t + 3 * stride);
+        s[4] = vld1q_s16(src_t + 4 * stride);
+        s[5] = vld1q_s16(src_t + 5 * stride);
+        s[6] = vld1q_s16(src_t + 6 * stride);
+        s[7] = vld1q_s16(src_t + 7 * stride);
+        s0 = vmlal_s16(s0, vget_low_s16(s[0]), vget_low_s16(s[0]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[1]), vget_low_s16(s[1]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[2]), vget_low_s16(s[2]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[3]), vget_low_s16(s[3]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[4]), vget_low_s16(s[4]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[5]), vget_low_s16(s[5]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[6]), vget_low_s16(s[6]));
+        s0 = vmlal_s16(s0, vget_low_s16(s[7]), vget_low_s16(s[7]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[0]), vget_high_s16(s[0]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[1]), vget_high_s16(s[1]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[2]), vget_high_s16(s[2]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[3]), vget_high_s16(s[3]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[4]), vget_high_s16(s[4]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[5]), vget_high_s16(s[5]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[6]), vget_high_s16(s[6]));
+        s0 = vmlal_s16(s0, vget_high_s16(s[7]), vget_high_s16(s[7]));
+        src_t += 8;
+        c -= 8;
+      } while (c);
+
+      s1 = vaddw_u32(s1, vget_low_u32(vreinterpretq_u32_s32(s0)));
+      s1 = vaddw_u32(s1, vget_high_u32(vreinterpretq_u32_s32(s0)));
+      src += 8 * stride;
+      r -= 8;
+    } while (r);
+
+    s2 = vadd_u64(vget_low_u64(s1), vget_high_u64(s1));
+  }
+
+  return vget_lane_u64(s2, 0);
+}
diff --git a/vpx_dsp/vpx_dsp.mk b/vpx_dsp/vpx_dsp.mk
index 167011034..0cdb70849 100644
--- a/vpx_dsp/vpx_dsp.mk
+++ b/vpx_dsp/vpx_dsp.mk
@@ -312,6 +312,7 @@ ifeq ($(CONFIG_ENCODERS),yes)
 DSP_SRCS-yes            += sad.c
 DSP_SRCS-yes            += subtract.c
 DSP_SRCS-yes            += sum_squares.c
+DSP_SRCS-$(HAVE_NEON)   += arm/sum_squares_neon.c
 DSP_SRCS-$(HAVE_SSE2)   += x86/sum_squares_sse2.c
 DSP_SRCS-$(HAVE_MSA)    += mips/sum_squares_msa.c
 
diff --git a/vpx_dsp/vpx_dsp_rtcd_defs.pl b/vpx_dsp/vpx_dsp_rtcd_defs.pl
index c2e287c66..8dfcb7276 100644
--- a/vpx_dsp/vpx_dsp_rtcd_defs.pl
+++ b/vpx_dsp/vpx_dsp_rtcd_defs.pl
@@ -922,7 +922,7 @@ add_proto qw/void vpx_sad4x4x4d/, "const uint8_t *src_ptr, int src_stride, const
 specialize qw/vpx_sad4x4x4d neon msa sse2 mmi/;
 
 add_proto qw/uint64_t vpx_sum_squares_2d_i16/, "const int16_t *src, int stride, int size";
-specialize qw/vpx_sum_squares_2d_i16 sse2 msa/;
+specialize qw/vpx_sum_squares_2d_i16 neon sse2 msa/;
 
 #
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