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Summary: Support for PowerPC Architecture Detecting AltiVec Support Closes facebook#2353 Differential Revision: D5210948 Pulled By: siying fbshipit-source-id: 859a8c063d37697addd89ba2b8a14e5efd5d24bf
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright (c) 2017 International Business Machines Corp. | ||
| // All rights reserved. | ||
| // This source code is licensed under the BSD-style license found in the | ||
| // LICENSE file in the root directory of this source tree. An additional grant | ||
| // of patent rights can be found in the PATENTS file in the same directory. | ||
| // This source code is also licensed under the GPLv2 license found in the | ||
| // COPYING file in the root directory of this source tree. | ||
|
|
||
| #define CRC_TABLE | ||
| #include <inttypes.h> | ||
| #include <stdlib.h> | ||
| #include <strings.h> | ||
| #include "util/crc32c_ppc_constants.h" | ||
|
|
||
| #define VMX_ALIGN 16 | ||
| #define VMX_ALIGN_MASK (VMX_ALIGN - 1) | ||
|
|
||
| #ifdef REFLECT | ||
| static unsigned int crc32_align(unsigned int crc, unsigned char const *p, | ||
| unsigned long len) { | ||
| while (len--) crc = crc_table[(crc ^ *p++) & 0xff] ^ (crc >> 8); | ||
| return crc; | ||
| } | ||
| #endif | ||
|
|
||
| #ifdef HAVE_POWER8 | ||
| unsigned int __crc32_vpmsum(unsigned int crc, unsigned char const *p, | ||
| unsigned long len); | ||
|
|
||
| static uint32_t crc32_vpmsum(uint32_t crc, unsigned char const *data, | ||
| unsigned len) { | ||
| unsigned int prealign; | ||
| unsigned int tail; | ||
|
|
||
| #ifdef CRC_XOR | ||
| crc ^= 0xffffffff; | ||
| #endif | ||
|
|
||
| if (len < VMX_ALIGN + VMX_ALIGN_MASK) { | ||
| crc = crc32_align(crc, data, (unsigned long)len); | ||
| goto out; | ||
| } | ||
|
|
||
| if ((unsigned long)data & VMX_ALIGN_MASK) { | ||
| prealign = VMX_ALIGN - ((unsigned long)data & VMX_ALIGN_MASK); | ||
| crc = crc32_align(crc, data, prealign); | ||
| len -= prealign; | ||
| data += prealign; | ||
| } | ||
|
|
||
| crc = __crc32_vpmsum(crc, data, (unsigned long)len & ~VMX_ALIGN_MASK); | ||
|
|
||
| tail = len & VMX_ALIGN_MASK; | ||
| if (tail) { | ||
| data += len & ~VMX_ALIGN_MASK; | ||
| crc = crc32_align(crc, data, tail); | ||
| } | ||
|
|
||
| out: | ||
| #ifdef CRC_XOR | ||
| crc ^= 0xffffffff; | ||
| #endif | ||
|
|
||
| return crc; | ||
| } | ||
|
|
||
| /* This wrapper function works around the fact that crc32_vpmsum | ||
| * does not gracefully handle the case where the data pointer is NULL. There | ||
| * may be room for performance improvement here. | ||
| */ | ||
| uint32_t crc32c_ppc(uint32_t crc, unsigned char const *data, unsigned len) { | ||
| unsigned char *buf2; | ||
|
|
||
| if (!data) { | ||
| buf2 = (unsigned char *)malloc(len); | ||
| bzero(buf2, len); | ||
| crc = crc32_vpmsum(crc, buf2, len); | ||
| free(buf2); | ||
| } else { | ||
| crc = crc32_vpmsum(crc, data, (unsigned long)len); | ||
| } | ||
| return crc; | ||
| } | ||
|
|
||
| #else /* HAVE_POWER8 */ | ||
|
|
||
| /* This symbol has to exist on non-ppc architectures (and on legacy | ||
| * ppc systems using power7 or below) in order to compile properly | ||
| * there, even though it won't be called. | ||
| */ | ||
| uint32_t crc32c_ppc(uint32_t crc, unsigned char const *data, unsigned len) { | ||
| return 0; | ||
| } | ||
|
|
||
| #endif /* HAVE_POWER8 */ |
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