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51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#include "zutil.h"
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#if defined(__linux__)
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# include <sys/auxv.h>
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# include <asm/hwcap.h>
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#elif defined(_WIN32)
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# include <winapifamily.h>
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#endif
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static int arm_has_crc32() {
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#if defined(__linux__) && defined(HWCAP2_CRC32)
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return (getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0 ? 1 : 0;
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#elif defined(ARM_NOCHECK_ACLE)
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return 1;
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#else
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return 0;
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#endif
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}
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/* AArch64 has neon. */
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#if !defined(__aarch64__)
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static inline int arm_has_neon()
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{
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#if defined(__linux__) && defined(HWCAP_NEON)
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return (getauxval(AT_HWCAP) & HWCAP_NEON) != 0 ? 1 : 0;
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#elif defined(_M_ARM) && defined(WINAPI_FAMILY_PARTITION)
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#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_PHONE_APP)
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return 1; /* Always supported */
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#endif
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#endif
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#if defined(ARM_NOCHECK_NEON)
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return 1;
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#else
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return 0;
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#endif
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}
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#endif
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ZLIB_INTERNAL int arm_cpu_has_neon;
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ZLIB_INTERNAL int arm_cpu_has_crc32;
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void ZLIB_INTERNAL arm_check_features(void) {
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#if defined(__aarch64__)
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arm_cpu_has_neon = 1; /* always available */
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#else
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arm_cpu_has_neon = arm_has_neon();
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#endif
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arm_cpu_has_crc32 = arm_has_crc32();
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}
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