[libc] add cpu feature flags for SVE/SVE2/MOPS

Author: SchrodingerZhu

libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake

@@ -9,7 +9,7 @@ if(LIBC_TARGET_ARCHITECTURE_IS_X86_64)
   set(ALL_CPU_FEATURES SSE2 SSE4_2 AVX AVX2 AVX512F AVX512BW FMA)
   set(LIBC_COMPILE_OPTIONS_NATIVE -march=native)
 elseif(LIBC_TARGET_ARCHITECTURE_IS_AARCH64)
-  set(ALL_CPU_FEATURES "FullFP16")
+  set(ALL_CPU_FEATURES FullFP16 MOPS SVE SVE2)
   set(LIBC_COMPILE_OPTIONS_NATIVE -mcpu=native)
 endif()
 

libc/cmake/modules/cpu_features/check_MOPS.cpp

@@ -0,0 +1,7 @@
+#include "src/__support/macros/properties/cpu_features.h"
+
+#ifndef LIBC_TARGET_CPU_HAS_MOPS
+#error unsupported
+#endif
+
+

libc/cmake/modules/cpu_features/check_SVE.cpp

@@ -0,0 +1,7 @@
+#include "src/__support/macros/properties/cpu_features.h"
+
+#ifndef LIBC_TARGET_CPU_HAS_SVE
+#error unsupported
+#endif
+
+

libc/cmake/modules/cpu_features/check_SVE2.cpp

@@ -0,0 +1,7 @@
+#include "src/__support/macros/properties/cpu_features.h"
+
+#ifndef LIBC_TARGET_CPU_HAS_SVE2
+#error unsupported
+#endif
+
+

libc/src/__support/macros/properties/cpu_features.h

@@ -18,6 +18,18 @@
 #define LIBC_TARGET_CPU_HAS_FULLFP16
 #endif
 
+#if defined(__ARM_FEATURE_SVE)
+#define LIBC_TARGET_CPU_HAS_SVE
+#endif
+
+#if defined(__ARM_FEATURE_SVE2)
+#define LIBC_TARGET_CPU_HAS_SVE2
+#endif
+
+#if defined(__ARM_FEATURE_MOPS)
+#define LIBC_TARGET_CPU_HAS_MOPS
+#endif
+
 #if defined(__SSE2__)
 #define LIBC_TARGET_CPU_HAS_SSE2
 #define LIBC_TARGET_CPU_HAS_FPU_FLOAT