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https://chromium.googlesource.com/libyuv/libyuv
synced 2025-12-07 17:26:49 +08:00
593965cea2
Including associated changes for adding a new scale_sme.cc file. There is no benefit from an SVE version of this kernel for devices with an SVE vector length of 128-bits, so skip directly to SME instead. We do not use the ZA tile here, so this is a purely streaming-SVE (SSVE) implementation. Change-Id: I47d149613fbabd8c203605a809811f1a668e8fb7 Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5913883 Reviewed-by: Frank Barchard <fbarchard@chromium.org> Reviewed-by: Justin Green <greenjustin@google.com>
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
/*
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* Copyright 2024 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/scale_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_SME) && defined(CLANG_HAS_SME) && \
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defined(__aarch64__)
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__arm_locally_streaming void ScaleRowDown2_SME(const uint8_t* src_ptr,
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ptrdiff_t src_stride,
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uint8_t* dst,
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int dst_width) {
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// Streaming-SVE only, no use of ZA tile.
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(void)src_stride;
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int vl;
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asm volatile(
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"cntb %x[vl] \n"
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"subs %w[dst_width], %w[dst_width], %w[vl] \n"
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"b.lt 2f \n"
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"1: \n"
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"ptrue p0.b \n"
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"ld2b {z0.b, z1.b}, p0/z, [%[src_ptr]] \n"
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"incb %[src_ptr], all, mul #2 \n"
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"subs %w[dst_width], %w[dst_width], %w[vl] \n"
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"st1b {z1.b}, p0, [%[dst_ptr]] \n"
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"incb %[dst_ptr] \n"
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"b.ge 1b \n"
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"2: \n"
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"adds %w[dst_width], %w[dst_width], %w[vl] \n"
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"b.eq 99f \n"
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"whilelt p0.b, wzr, %w[dst_width] \n"
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"ld2b {z0.b, z1.b}, p0/z, [%[src_ptr]] \n"
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"st1b {z1.b}, p0, [%[dst_ptr]] \n"
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"99: \n"
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: [src_ptr] "+r"(src_ptr), // %[src_ptr]
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[dst_ptr] "+r"(dst), // %[dst_ptr]
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[dst_width] "+r"(dst_width), // %[dst_width]
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[vl] "=r"(vl) // %[vl]
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:
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: "memory", "cc", "z0", "z1", "p0");
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}
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#endif // !defined(LIBYUV_DISABLE_SME) && defined(CLANG_HAS_SME) &&
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// 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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