Initial import of compiler-rt.

 -

llvm-svn: 74292

1 files changed, 43 insertions, 0 deletions

diff --git a/compiler-rt/lib/fixsfti.c b/compiler-rt/lib/fixsfti.c
new file mode 100644
index 00000000000..8e395875790
--- /dev/null
+++ b/compiler-rt/lib/fixsfti.c
@@ -0,0 +1,43 @@
+//===-- fixsfti.c - Implement __fixsfti -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __fixsfti for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if __x86_64
+
+#include "int_lib.h"
+
+// Returns: convert a to a signed long long, rounding toward zero.
+
+// Assumption: float is a IEEE 32 bit floating point type 
+//             su_int is a 32 bit integral type
+//             value in float is representable in ti_int (no range checking performed)
+
+// seee eeee emmm mmmm mmmm mmmm mmmm mmmm
+
+ti_int
+__fixsfti(float a)
+{
+    float_bits fb;
+    fb.f = a;
+    int e = ((fb.u & 0x7F800000) >> 23) - 127;
+    if (e < 0)
+        return 0;
+    ti_int s = (si_int)(fb.u & 0x80000000) >> 31;
+    ti_int r = (fb.u & 0x007FFFFF) | 0x00800000;
+    if (e > 23)
+        r <<= (e - 23);
+    else
+        r >>= (23 - e);
+    return (r ^ s) - s;
+}
+
+#endif