Use sysctls available in macOS 12/iOS 15 for Apple silicon

README.md

@@ -220,9 +220,10 @@ LDFLAGS+= $(pkg-config --libs libcpuinfo)
   - [x] x86-64 (iPhone simulator)
   - [x] ARMv7
   - [x] ARM64
-- [x] OS X
+- [x] macOS
   - [x] x86
   - [x] x86-64
+  - [x] ARM64 (Apple silicon)
 - [x] Windows
   - [x] x86
   - [x] x86-64

include/cpuinfo.h

@@ -1468,6 +1468,7 @@ static inline bool cpuinfo_has_x86_sha(void) {
 		bool dot;
 		bool jscvt;
 		bool fcma;
+		bool fhm;
 
 		bool aes;
 		bool sha1;
@@ -1737,6 +1738,14 @@ static inline bool cpuinfo_has_arm_fcma(void) {
 	#endif
 }
 
+static inline bool cpuinfo_has_arm_fhm(void) {
+	#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
+		return cpuinfo_isa.fhm;
+	#else
+		return false;
+	#endif
+}
+
 static inline bool cpuinfo_has_arm_aes(void) {
 	#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
 		return cpuinfo_isa.aes;

src/arm/linux/aarch64-isa.c

@@ -124,4 +124,8 @@ void cpuinfo_arm64_linux_decode_isa_from_proc_cpuinfo(
 	if (features2 & CPUINFO_ARM_LINUX_FEATURE2_SVE2) {
 		isa->sve2 = true;
 	}
+	if (features & CPUINFO_ARM_LINUX_FEATURE_ASIMDFHM) {
+		isa->fhm = true;
+	}
+
 }

src/arm/linux/cpuinfo.c

@@ -283,6 +283,8 @@ static void parse_features(
 					#if CPUINFO_ARCH_ARM64
 						processor->features |= CPUINFO_ARM_LINUX_FEATURE_ASIMDRDM;
 					#endif
+				} else if (memcmp(feature_start, "asimdfhm", feature_length) == 0) {
+					processor->features |= CPUINFO_ARM_LINUX_FEATURE_ASIMDFHM;
 #if CPUINFO_ARCH_ARM
 				} else if (memcmp(feature_start, "fastmult", feature_length) == 0) {
 					processor->features |= CPUINFO_ARM_LINUX_FEATURE_FASTMULT;