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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>
101 lines
3.3 KiB
C++
101 lines
3.3 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(__ARM_NEON__) && \
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!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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"vmov.u16 q4, #0 \n" // accumulator
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"1: \n"
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"vld1.8 {q0, q1}, [%0]! \n"
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"vld1.8 {q2, q3}, [%1]! \n"
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"veor.32 q0, q0, q2 \n"
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"veor.32 q1, q1, q3 \n"
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"vcnt.i8 q0, q0 \n"
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"vcnt.i8 q1, q1 \n"
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"subs %2, %2, #32 \n"
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"vadd.u8 q0, q0, q1 \n" // 16 byte counts
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"vpadal.u8 q4, q0 \n" // 8 shorts
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"bgt 1b \n"
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"vpaddl.u16 q0, q4 \n" // 4 ints
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"vpadd.u32 d0, d0, d1 \n"
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"vpadd.u32 d0, d0, d0 \n"
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"vmov.32 %3, d0[0] \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", "q0", "q1", "q2", "q3", "q4");
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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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"vmov.u8 q8, #0 \n"
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"vmov.u8 q10, #0 \n"
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"vmov.u8 q9, #0 \n"
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"vmov.u8 q11, #0 \n"
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"1: \n"
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MEMACCESS(0)
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"vld1.8 {q0}, [%0]! \n"
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MEMACCESS(1)
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"vld1.8 {q1}, [%1]! \n"
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"subs %2, %2, #16 \n"
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"vsubl.u8 q2, d0, d2 \n"
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"vsubl.u8 q3, d1, d3 \n"
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"vmlal.s16 q8, d4, d4 \n"
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"vmlal.s16 q9, d6, d6 \n"
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"vmlal.s16 q10, d5, d5 \n"
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"vmlal.s16 q11, d7, d7 \n"
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"bgt 1b \n"
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"vadd.u32 q8, q8, q9 \n"
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"vadd.u32 q10, q10, q11 \n"
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"vadd.u32 q11, q8, q10 \n"
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"vpaddl.u32 q1, q11 \n"
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"vadd.u64 d0, d2, d3 \n"
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"vmov.32 %3, d0[0] \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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: "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11");
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return sse;
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}
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#endif // defined(__ARM_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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