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https://chromium.googlesource.com/libyuv/libyuv
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d981495b42
Summing 16 bit hamming codes restricts the maximum length, but saves an inner loop instruction. The outer loop can sum the values. 32 bit Neon Now BenchmarkHammingDistance_Opt (78 ms) Was BenchmarkHammingDistance_Opt (92 ms) 64 bit Neon Now BenchmarkHammingDistance_Opt (85 ms) Was BenchmarkHammingDistance_Opt (92 ms) R=wangcheng@google.com TBR=kjellander@chromium.org BUG=libyuv:701 TEST=BenchmarkHammingDistance Change-Id: Ie40f0eac2f3339c33b833b42af5d394b122066ae Reviewed-on: https://chromium-review.googlesource.com/526932 Reviewed-by: Frank Barchard <fbarchard@google.com> Reviewed-by: Cheng Wang <wangcheng@google.com> Commit-Queue: Frank Barchard <fbarchard@google.com>
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
/*
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* Copyright 2012 The LibYuv Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "libyuv/basic_types.h"
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#include "libyuv/compare_row.h"
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#include "libyuv/row.h"
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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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#if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
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// 256 bits at a time
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// uses short accumulator which restricts count to 131 KB
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uint32 HammingDistance_NEON(const uint8* src_a, const uint8* src_b, int count) {
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uint32 diff;
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asm volatile (
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"movi v4.8h, #0 \n"
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"1: \n"
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"ld1 {v0.16b, v1.16b}, [%0], #32 \n"
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"ld1 {v2.16b, v3.16b}, [%1], #32 \n"
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"eor v0.16b, v0.16b, v2.16b \n"
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"eor v1.16b, v1.16b, v3.16b \n"
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"cnt v0.16b, v0.16b \n"
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"cnt v1.16b, v1.16b \n"
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"subs %w2, %w2, #32 \n"
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"add v0.16b, v0.16b, v1.16b \n"
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"uadalp v4.8h, v0.16b \n"
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"b.gt 1b \n"
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"uaddlv s4, v4.8h \n"
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"fmov %w3, s4 \n"
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: "+r"(src_a),
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"+r"(src_b),
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"+r"(count),
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"=r"(diff)
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:
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: "cc", "v0", "v1", "v2", "v3", "v4");
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return diff;
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}
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uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
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uint32 sse;
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asm volatile (
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"eor v16.16b, v16.16b, v16.16b \n"
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"eor v18.16b, v18.16b, v18.16b \n"
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"eor v17.16b, v17.16b, v17.16b \n"
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"eor v19.16b, v19.16b, v19.16b \n"
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"1: \n"
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MEMACCESS(0)
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"ld1 {v0.16b}, [%0], #16 \n"
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MEMACCESS(1)
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"ld1 {v1.16b}, [%1], #16 \n"
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"subs %w2, %w2, #16 \n"
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"usubl v2.8h, v0.8b, v1.8b \n"
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"usubl2 v3.8h, v0.16b, v1.16b \n"
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"smlal v16.4s, v2.4h, v2.4h \n"
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"smlal v17.4s, v3.4h, v3.4h \n"
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"smlal2 v18.4s, v2.8h, v2.8h \n"
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"smlal2 v19.4s, v3.8h, v3.8h \n"
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"b.gt 1b \n"
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"add v16.4s, v16.4s, v17.4s \n"
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"add v18.4s, v18.4s, v19.4s \n"
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"add v19.4s, v16.4s, v18.4s \n"
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"addv s0, v19.4s \n"
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"fmov %w3, s0 \n"
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: "+r"(src_a),
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"+r"(src_b),
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"+r"(count),
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"=r"(sse)
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:
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: "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19");
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return sse;
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}
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#endif // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__)
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#ifdef __cplusplus
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} // extern "C"
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} // namespace libyuv
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#endif
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