diff options
Diffstat (limited to 'libcutils/arch-mips/android_memset.c')
-rw-r--r-- | libcutils/arch-mips/android_memset.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/libcutils/arch-mips/android_memset.c b/libcutils/arch-mips/android_memset.c new file mode 100644 index 0000000..a6b7496 --- /dev/null +++ b/libcutils/arch-mips/android_memset.c @@ -0,0 +1,93 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* generic C version for any machine */ + +#include <cutils/memory.h> + +void android_memset16(uint16_t* dst, uint16_t value, size_t size) +{ + /* optimized version of + size >>= 1; + while (size--) + *dst++ = value; + */ + + size >>= 1; + if (((uintptr_t)dst & 2) && size) { + /* fill unpaired first elem separately */ + *dst++ = value; + size--; + } + /* dst is now 32-bit-aligned */ + /* fill body with 32-bit pairs */ + uint32_t value32 = (value << 16) | value; + android_memset32((uint32_t*) dst, value32, size<<1); + if (size & 1) { + dst[size-1] = value; /* fill unpaired last elem */ + } +} + + +void android_memset32(uint32_t* dst, uint32_t value, size_t size) +{ + /* optimized version of + size >>= 2; + while (size--) + *dst++ = value; + */ + + size >>= 2; + if (((uintptr_t)dst & 4) && size) { + /* fill unpaired first 32-bit elem separately */ + *dst++ = value; + size--; + } + /* dst is now 64-bit aligned */ + /* fill body with 64-bit pairs */ + uint64_t value64 = (((uint64_t)value)<<32) | value; + uint64_t* dst64 = (uint64_t*)dst; + + while (size >= 12) { + dst64[0] = value64; + dst64[1] = value64; + dst64[2] = value64; + dst64[3] = value64; + dst64[4] = value64; + dst64[5] = value64; + size -= 12; + dst64 += 6; + } + + /* fill remainder with original 32-bit single-elem loop */ + dst = (uint32_t*) dst64; + while (size--) { + *dst++ = value; + } + +} |