Add mm_malloc.h, patch by Sam Weinig.

llvm-svn: 61954

1 files changed, 59 insertions, 0 deletions

diff --git a/clang/lib/Headers/mm_malloc.h b/clang/lib/Headers/mm_malloc.h
new file mode 100644
index 00000000000..71e7b87ae8e
--- /dev/null
+++ b/clang/lib/Headers/mm_malloc.h
@@ -0,0 +1,59 @@
+/*===---- mm_malloc.h - Allocating and Freeing Aligned Memory Blocks -------===
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+#ifndef __MM_MALLOC_H
+#define __MM_MALLOC_H
+
+#include <errno.h>
+#include <stdlib.h>
+
+static inline void *__attribute__((__always_inline__)) _mm_malloc(size_t size, size_t align)
+{
+  if (align & (align - 1)) {
+    errno = EINVAL;
+    return 0;
+  }
+
+  if (!size)
+    return 0;
+
+  if (align < 2 * sizeof(void *))
+    align = 2 * sizeof(void *);
+
+  void *mallocedMemory = malloc(size + align);
+  if (!mallocedMemory)
+    return 0;
+
+  void *alignedMemory = (void *)(((size_t)mallocedMemory + align) & ~((size_t)align - 1));
+  ((void **)alignedMemory)[-1] = mallocedMemory;
+
+  return alignedMemory;
+}
+
+static inline void __attribute__((__always_inline__)) _mm_free(void *p)
+{
+  if (p)
+    free(((void **)p)[-1]);
+}
+
+#endif /* __MM_MALLOC_H */