See attached. This removes a dependency on errno.h and improves
compatibility with GCC's implementation.
-Matt
--- /tmp/llvm/trunk/tools/clang/lib/Headers/mm_malloc.h 2010-03-26 13:20:42.000000000 -0700
+++ tools/clang/lib/Headers/mm_malloc.h 2010-10-05 09:54:34.800365000 -0700
@@ -24,39 +24,36 @@
#ifndef __MM_MALLOC_H
#define __MM_MALLOC_H
-#include <errno.h>
#include <stdlib.h>
+#ifndef __cplusplus
+extern int posix_memalign(void **memptr, size_t alignment, size_t size);
+#else
+extern "C" int posix_memalign(void **memptr, size_t alignment, size_t size)
+ throw ();
+#endif
+
static __inline__ void *__attribute__((__always_inline__, __nodebug__))
_mm_malloc(size_t size, size_t align)
{
- if (align & (align - 1)) {
- errno = EINVAL;
- return 0;
+ if (align == 1) {
+ return malloc(size);
}
- if (!size)
- return 0;
+ if (!(align & (align - 1)) && align < sizeof(void *))
+ align = sizeof(void *);
- if (align < 2 * sizeof(void *))
- align = 2 * sizeof(void *);
-
- void *mallocedMemory = malloc(size + align);
- if (!mallocedMemory)
+ void *mallocedMemory;
+ if (posix_memalign(&mallocedMemory, align, size))
return 0;
- void *alignedMemory =
- (void *)(((size_t)mallocedMemory + align) & ~((size_t)align - 1));
- ((void **)alignedMemory)[-1] = mallocedMemory;
-
- return alignedMemory;
+ return mallocedMemory;
}
static __inline__ void __attribute__((__always_inline__, __nodebug__))
_mm_free(void *p)
{
- if (p)
- free(((void **)p)[-1]);
+ free(p);
}
#endif /* __MM_MALLOC_H */
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