Zlib ng

libs/zlibng/arch/arm/armfeature.c

@@ -0,0 +1,50 @@
+#include "zutil.h"
+
+#if defined(__linux__)
+# include <sys/auxv.h>
+# include <asm/hwcap.h>
+#elif defined(_WIN32)
+# include <winapifamily.h>
+#endif
+
+static int arm_has_crc32() {
+#if defined(__linux__) && defined(HWCAP2_CRC32)
+  return (getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0 ? 1 : 0;
+#elif defined(ARM_NOCHECK_ACLE)
+  return 1;
+#else
+  return 0;
+#endif
+}
+
+/* AArch64 has neon. */
+#if !defined(__aarch64__)
+static inline int arm_has_neon()
+{
+ #if defined(__linux__) && defined(HWCAP_NEON)
+    return (getauxval(AT_HWCAP) & HWCAP_NEON) != 0 ? 1 : 0;
+ #elif defined(_M_ARM) && defined(WINAPI_FAMILY_PARTITION)
+  #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_PHONE_APP)
+    return 1; /* Always supported */
+  #endif
+ #endif
+
+ #if defined(ARM_NOCHECK_NEON)
+    return 1;
+ #else
+    return 0;
+ #endif
+}
+#endif
+
+ZLIB_INTERNAL int arm_cpu_has_neon;
+ZLIB_INTERNAL int arm_cpu_has_crc32;
+
+void ZLIB_INTERNAL arm_check_features(void) {
+#if defined(__aarch64__)
+  arm_cpu_has_neon = 1; /* always available */
+#else
+  arm_cpu_has_neon = arm_has_neon();
+#endif
+  arm_cpu_has_crc32 = arm_has_crc32();
+}