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https://chromium.googlesource.com/libyuv/libyuv
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95eed2b75f
We can use the Neon dot-product instructions as a slightly faster widening accumulation. This also has the advantage of widening to 32 bits so avoids the risk of overflow present in the original Neon code. Reduction in runtimes observed for HammingDistance compared to the existing Neon code: Cortex-A55: -4.4% Cortex-A510: -26.5% Cortex-A76: -8.1% Cortex-A720: -15.5% Cortex-X1: -4.1% Cortex-X2: -5.1% Bug: libyuv:977 Change-Id: I9e5e10d228c339d905cb2e668a9811ff0a6af5de Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5490049 Reviewed-by: Frank Barchard <fbarchard@chromium.org> Commit-Queue: Frank Barchard <fbarchard@chromium.org>
157 lines
6.1 KiB
C++
157 lines
6.1 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_t HammingDistance_NEON(const uint8_t* src_a,
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const uint8_t* src_b,
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int count) {
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uint32_t 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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"prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead
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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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"prfm pldl1keep, [%1, 448] \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), "+r"(src_b), "+r"(count), "=r"(diff)
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:
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: "memory", "cc", "v0", "v1", "v2", "v3", "v4");
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return diff;
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}
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uint32_t SumSquareError_NEON(const uint8_t* src_a,
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const uint8_t* src_b,
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int count) {
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uint32_t sse;
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asm volatile(
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"movi v16.16b, #0 \n"
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"movi v17.16b, #0 \n"
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"movi v18.16b, #0 \n"
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"movi v19.16b, #0 \n"
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"1: \n"
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"ld1 {v0.16b}, [%0], #16 \n"
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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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"prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead
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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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"prfm pldl1keep, [%1, 448] \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), "+r"(src_b), "+r"(count), "=r"(sse)
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:
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: "memory", "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19");
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return sse;
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}
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uint32_t HammingDistance_NEON_DotProd(const uint8_t* src_a,
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const uint8_t* src_b,
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int count) {
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uint32_t diff;
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asm volatile(
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"movi v4.4s, #0 \n"
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"movi v5.4s, #0 \n"
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"movi v6.16b, #1 \n"
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"1: \n"
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"ldp q0, q1, [%0], #32 \n"
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"ldp q2, q3, [%1], #32 \n"
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"eor v0.16b, v0.16b, v2.16b \n"
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"prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead
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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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"prfm pldl1keep, [%1, 448] \n"
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"cnt v1.16b, v1.16b \n"
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"subs %w2, %w2, #32 \n"
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"udot v4.4s, v0.16b, v6.16b \n"
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"udot v5.4s, v1.16b, v6.16b \n"
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"b.gt 1b \n"
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"add v0.4s, v4.4s, v5.4s \n"
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"addv s0, v0.4s \n"
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"fmov %w3, s0 \n"
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: "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(diff)
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:
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: "memory", "cc", "v0", "v1", "v2", "v3", "v4", "v5", "v6");
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return diff;
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}
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uint32_t SumSquareError_NEON_DotProd(const uint8_t* src_a,
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const uint8_t* src_b,
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int count) {
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// count is guaranteed to be a multiple of 32.
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uint32_t sse;
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asm volatile(
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"movi v4.4s, #0 \n"
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"movi v5.4s, #0 \n"
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"1: \n"
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"ldp q0, q2, [%0], #32 \n"
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"ldp q1, q3, [%1], #32 \n"
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"subs %w2, %w2, #32 \n"
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"uabd v0.16b, v0.16b, v1.16b \n"
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"uabd v1.16b, v2.16b, v3.16b \n"
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"prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead
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"udot v4.4s, v0.16b, v0.16b \n"
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"udot v5.4s, v1.16b, v1.16b \n"
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"prfm pldl1keep, [%1, 448] \n"
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"b.gt 1b \n"
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"add v0.4s, v4.4s, v5.4s \n"
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"addv s0, v0.4s \n"
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"fmov %w3, s0 \n"
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: "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(sse)
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:
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: "memory", "cc", "v0", "v1", "v2", "v3", "v4", "v5");
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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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