merge from dev-slice

include/mimalloc/internal.h

@@ -30,14 +30,17 @@ terms of the MIT license. A copy of the license can be found in the file
 #define mi_decl_noinline        __declspec(noinline)
 #define mi_decl_thread          __declspec(thread)
 #define mi_decl_cache_align     __declspec(align(MI_CACHE_LINE))
+#define mi_decl_weak            
 #elif (defined(__GNUC__) && (__GNUC__ >= 3)) || defined(__clang__) // includes clang and icc
 #define mi_decl_noinline        __attribute__((noinline))
 #define mi_decl_thread          __thread
 #define mi_decl_cache_align     __attribute__((aligned(MI_CACHE_LINE)))
+#define mi_decl_weak            __attribute__((weak))
 #else
 #define mi_decl_noinline
 #define mi_decl_thread          __thread        // hope for the best :-)
 #define mi_decl_cache_align
+#define mi_decl_weak           
 #endif
 
 #if defined(__EMSCRIPTEN__) && !defined(__wasi__)
@@ -324,6 +327,17 @@ static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
   }
 }
 
+// Align a pointer upwards
+static inline void* mi_align_up_ptr(void* p, size_t alignment) {
+  return (void*)_mi_align_up((uintptr_t)p, alignment);
+}
+
+// Align a pointer downwards
+static inline void* mi_align_down_ptr(void* p, size_t alignment) {
+  return (void*)_mi_align_down((uintptr_t)p, alignment);
+}
+
+
 // Divide upwards: `s <= _mi_divide_up(s,d)*d < s+d`.
 static inline uintptr_t _mi_divide_up(uintptr_t size, size_t divider) {
   mi_assert_internal(divider != 0);