src/opts/SkMemset_opts.h

/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkUtils_opts_DEFINED
#define SkUtils_opts_DEFINED

#include <stdint.h>
#include "src/base/SkVx.h"

namespace SK_OPTS_NS {

    template <typename T>
    static void memsetT(T buffer[], T value, int count) {
    #if defined(SK_CPU_SSE_LEVEL) && SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_AVX
        static constexpr int VecSize = 32 / sizeof(T);
    #else
        static constexpr int VecSize = 16 / sizeof(T);
    #endif
        static_assert(VecSize > 0, "T is too big for memsetT");
        // Create an vectorized version of value
        skvx::Vec<VecSize,T> wideValue(value);
        while (count >= VecSize) {
            // Copy the value into the destination buffer (VecSize elements at a time)
            wideValue.store(buffer);
            buffer += VecSize;
            count  -= VecSize;
        }
        // If count was not an even multiple of VecSize, take care of the last few.
        while (count-- > 0) {
            *buffer++ = value;
        }
    }

    /*not static*/ inline void memset16(uint16_t buffer[], uint16_t value, int count) {
        memsetT(buffer, value, count);
    }
    /*not static*/ inline void memset32(uint32_t buffer[], uint32_t value, int count) {
        memsetT(buffer, value, count);
    }
    /*not static*/ inline void memset64(uint64_t buffer[], uint64_t value, int count) {
        memsetT(buffer, value, count);
    }

    template <typename T>
    static void rect_memsetT(T buffer[], T value, int count, size_t rowBytes, int height) {
        while (height --> 0) {
            memsetT(buffer, value, count);
            buffer = (T*)((char*)buffer + rowBytes);
        }
    }

    /*not static*/ inline void rect_memset16(uint16_t buffer[], uint16_t value, int count,
                                             size_t rowBytes, int height) {
        rect_memsetT(buffer, value, count, rowBytes, height);
    }
    /*not static*/ inline void rect_memset32(uint32_t buffer[], uint32_t value, int count,
                                             size_t rowBytes, int height) {
        rect_memsetT(buffer, value, count, rowBytes, height);
    }
    /*not static*/ inline void rect_memset64(uint64_t buffer[], uint64_t value, int count,
                                             size_t rowBytes, int height) {
        rect_memsetT(buffer, value, count, rowBytes, height);
    }

}  // namespace SK_OPTS_NS

#endif//SkUtils_opts_DEFINED