Imported Upstream version 1.6.0+dfsg1

[rustc.git] / src / compiler-rt / lib / builtins / fixsfdi.c

diff --git a/src/compiler-rt/lib/builtins/fixsfdi.c b/src/compiler-rt/lib/builtins/fixsfdi.c
index 4f6cfdd7a5c622321061caf3dfefa00b98fe75ce..fab47e272a25155ad3a971dada9a85bac393bce0 100644 (file)
--- a/src/compiler-rt/lib/builtins/fixsfdi.c
+++ b/src/compiler-rt/lib/builtins/fixsfdi.c
@@ -1,43 +1,47 @@
 /* ===-- fixsfdi.c - Implement __fixsfdi -----------------------------------===
  *
- *                    The LLVM Compiler Infrastructure
+ *                     The LLVM Compiler Infrastructure
  *
  * This file is dual licensed under the MIT and the University of Illinois Open
  * Source Licenses. See LICENSE.TXT for details.
  *
  * ===----------------------------------------------------------------------===
- *
- * This file implements __fixsfdi for the compiler_rt library.
- *
- * ===----------------------------------------------------------------------===
  */
 
-#include "int_lib.h"
+#define SINGLE_PRECISION
+#include "fp_lib.h"
 
-/* Returns: convert a to a signed long long, rounding toward zero. */
+ARM_EABI_FNALIAS(f2lz, fixsfdi)
 
-/* Assumption: float is a IEEE 32 bit floating point type 
- *             su_int is a 32 bit integral type
- *             value in float is representable in di_int (no range checking performed)
+#ifndef __SOFT_FP__
+/* Support for systems that have hardware floating-point; can set the invalid
+ * flag as a side-effect of computation.
  */
 
-/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
-
-ARM_EABI_FNALIAS(f2lz, fixsfdi)
+COMPILER_RT_ABI du_int __fixunssfdi(float a);
 
 COMPILER_RT_ABI di_int
 __fixsfdi(float a)
 {
-    float_bits fb;
-    fb.f = a;
-    int e = ((fb.u & 0x7F800000) >> 23) - 127;
-    if (e < 0)
-        return 0;
-    di_int s = (si_int)(fb.u & 0x80000000) >> 31;
-    di_int r = (fb.u & 0x007FFFFF) | 0x00800000;
-    if (e > 23)
-        r <<= (e - 23);
-    else
-        r >>= (23 - e);
-    return (r ^ s) - s;
+    if (a < 0.0f) {
+        return -__fixunssfdi(-a);
+    }
+    return __fixunssfdi(a);
 }
+
+#else
+/* Support for systems that don't have hardware floating-point; there are no
+ * flags to set, and we don't want to code-gen to an unknown soft-float
+ * implementation.
+ */
+
+typedef di_int fixint_t;
+typedef du_int fixuint_t;
+#include "fp_fixint_impl.inc"
+
+COMPILER_RT_ABI di_int
+__fixsfdi(fp_t a) {
+    return __fixint(a);
+}
+
+#endif