Initial import of compiler-rt.

 -

llvm-svn: 74292

1 files changed, 33 insertions, 0 deletions

diff --git a/compiler-rt/lib/absvti2.c b/compiler-rt/lib/absvti2.c
new file mode 100644
index 00000000000..c0869719d3f
--- /dev/null
+++ b/compiler-rt/lib/absvti2.c
@@ -0,0 +1,33 @@
+//===-- absvti2.c - Implement __absvdi2 -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __absvti2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if __x86_64
+
+#include "int_lib.h"
+#include <stdlib.h>
+
+// Returns: absolute value
+
+// Effects: aborts if abs(x) < 0
+
+ti_int
+__absvti2(ti_int a)
+{
+    const int N = (int)(sizeof(ti_int) * CHAR_BIT);
+    if (a == ((ti_int)1 << (N-1)))
+        abort();
+    const ti_int s = a >> (N - 1);
+    return (a ^ s) - s;
+}
+
+#endif