101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* generic C version for any machine */
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#include <cutils/memory.h>
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#ifdef __clang__
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__attribute__((no_sanitize("integer")))
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#endif
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void android_memset16(uint16_t* dst, uint16_t value, size_t size)
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{
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/* optimized version of
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size >>= 1;
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while (size--)
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*dst++ = value;
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*/
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size >>= 1;
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if (((uintptr_t)dst & 2) && size) {
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/* fill unpaired first elem separately */
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*dst++ = value;
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size--;
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}
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/* dst is now 32-bit-aligned */
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/* fill body with 32-bit pairs */
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uint32_t value32 = (((uint32_t)value) << 16) | ((uint32_t)value);
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android_memset32((uint32_t*) dst, value32, size<<1);
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if (size & 1) {
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dst[size-1] = value; /* fill unpaired last elem */
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}
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}
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#ifdef __clang__
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__attribute__((no_sanitize("integer")))
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#endif
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void android_memset32(uint32_t* dst, uint32_t value, size_t size)
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{
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/* optimized version of
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size >>= 2;
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while (size--)
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*dst++ = value;
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*/
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size >>= 2;
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if (((uintptr_t)dst & 4) && size) {
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/* fill unpaired first 32-bit elem separately */
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*dst++ = value;
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size--;
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}
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/* dst is now 64-bit aligned */
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/* fill body with 64-bit pairs */
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uint64_t value64 = (((uint64_t)value) << 32) | ((uint64_t)value);
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uint64_t* dst64 = (uint64_t*)dst;
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while (size >= 12) {
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dst64[0] = value64;
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dst64[1] = value64;
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dst64[2] = value64;
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dst64[3] = value64;
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dst64[4] = value64;
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dst64[5] = value64;
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size -= 12;
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dst64 += 6;
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}
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/* fill remainder with original 32-bit single-elem loop */
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dst = (uint32_t*) dst64;
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while (size != 0) {
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size--;
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*dst++ = value;
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}
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}
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