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https://github.com/GerbilSoft/zlib-ng.git
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8976caa3f0
ARM64EC is a new ARM64 variant introduced in Windows 11 that uses an ABI similar to AMD64, which allows for better interoperability with emulated AMD64 applications. When enabled in MSVC, it defines _M_AMD64 and _M_ARM64EC, but not _M_ARM64, so we need to check for _M_ARM64EC.
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/* crc32_acle.c -- compute the CRC-32 of a data stream
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* Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
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* Copyright (C) 2016 Yang Zhang
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* For conditions of distribution and use, see copyright notice in zlib.h
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*
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*/
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#ifdef ARM_ACLE
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#ifdef _MSC_VER
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# include <intrin.h>
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#else
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# include <arm_acle.h>
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#endif
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#include "../../zbuild.h"
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Z_INTERNAL uint32_t crc32_acle(uint32_t crc, const uint8_t *buf, size_t len) {
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Z_REGISTER uint32_t c;
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Z_REGISTER const uint16_t *buf2;
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Z_REGISTER const uint32_t *buf4;
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c = ~crc;
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if (len && ((ptrdiff_t)buf & 1)) {
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c = __crc32b(c, *buf++);
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len--;
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}
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if ((len >= sizeof(uint16_t)) && ((ptrdiff_t)buf & sizeof(uint16_t))) {
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buf2 = (const uint16_t *) buf;
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c = __crc32h(c, *buf2++);
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len -= sizeof(uint16_t);
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buf4 = (const uint32_t *) buf2;
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} else {
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buf4 = (const uint32_t *) buf;
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}
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#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
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if ((len >= sizeof(uint32_t)) && ((ptrdiff_t)buf & sizeof(uint32_t))) {
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c = __crc32w(c, *buf4++);
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len -= sizeof(uint32_t);
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}
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if (len == 0) {
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c = ~c;
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return c;
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}
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const uint64_t *buf8 = (const uint64_t *) buf4;
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while (len >= sizeof(uint64_t)) {
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c = __crc32d(c, *buf8++);
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len -= sizeof(uint64_t);
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}
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if (len >= sizeof(uint32_t)) {
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buf4 = (const uint32_t *) buf8;
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c = __crc32w(c, *buf4++);
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len -= sizeof(uint32_t);
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buf2 = (const uint16_t *) buf4;
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} else {
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buf2 = (const uint16_t *) buf8;
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}
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if (len >= sizeof(uint16_t)) {
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c = __crc32h(c, *buf2++);
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len -= sizeof(uint16_t);
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}
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buf = (const unsigned char *) buf2;
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#else /* __aarch64__ */
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if (len == 0) {
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c = ~c;
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return c;
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}
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while (len >= sizeof(uint32_t)) {
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c = __crc32w(c, *buf4++);
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len -= sizeof(uint32_t);
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}
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if (len >= sizeof(uint16_t)) {
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buf2 = (const uint16_t *) buf4;
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c = __crc32h(c, *buf2++);
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len -= sizeof(uint16_t);
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buf = (const unsigned char *) buf2;
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} else {
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buf = (const unsigned char *) buf4;
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}
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#endif /* __aarch64__ */
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if (len) {
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c = __crc32b(c, *buf);
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}
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c = ~c;
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return c;
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}
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#endif
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