implementations moved on the composer class.

CMakeLists.txt

@@ -94,7 +94,9 @@ if (WIN32)
 endif()
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-  target_compile_options(snmalloc_lib INTERFACE -mcx16)
+  if (NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
+    target_compile_options(snmalloc_lib INTERFACE -mcx16)
+  endif()
 endif ()
 
 # Have to set this globally, as can't be set on an interface target.

src/aal/aal.h

@@ -2,6 +2,7 @@
 #include "../ds/defines.h"
 
 #include <cstdint>
+#include <ctime>
 
 #if defined(__i386__) || defined(_M_IX86) || defined(_X86_) || \
   defined(__amd64__) || defined(__x86_64__) || defined(_M_X64) || \
@@ -11,6 +12,10 @@
 
 #if defined(__arm__) || defined(__aarch64__)
 #  define PLATFORM_IS_ARM
+   /**
+    * on ARM cpu counters are accessible only in privileged mode
+    */
+#  define SNMALLOC_NO_ALL_CPUCOUNTERS
 #endif
 
 namespace snmalloc
@@ -63,7 +68,12 @@ namespace snmalloc
      */
     static inline uint64_t tick()
     {
-#if __has_builtin(__builtin_readcyclecounter) && \
+#if defined(SNMALLOC_NO_ALL_CPUCOUNTERS)
+      struct timespec n = {0, 0ul};
+      clock_gettime(CLOCK_MONOTONIC, &n);
+
+      return static_cast<uint64_t>((n.tv_sec) * (1000000000 * n.tv_nsec));
+#elif __has_builtin(__builtin_readcyclecounter) && \
   !defined(SNMALLOC_NO_AAL_BUILTINS)
       return __builtin_readcyclecounter();
 #else

src/aal/aal_arm.h

@@ -31,21 +31,13 @@ namespace snmalloc
     /**
      * Issue a prefetch hint at the specified address.
      */
-    static inline void prefetch(void* ptr)
+    static inline void prefetch(void*)
     {
-      __builtin_prefetch(ptr, 0, 1);
     }
 
-    /**
-     * Return a cycle counter value.
-     * on ARM cpu counters are accessible only in privileged mode
-     */
     static inline uint64_t tick()
     {
-      struct timespec n = {0, 0ul};
-      clock_gettime(CLOCK_MONOTONIC, &n);
-
-      return static_cast<uint64_t>((n.tv_sec) * (1000000000ul * n.tv_nsec));
+      return 0ull;
     }
   };