Refactor float to integer conversion to share the same code.

80bit Intel/PPC long double is excluded due to lacking support
for the abstraction. Consistently provide saturation logic.
Extend to long double on 128bit IEEE extended platforms.

Initial patch with test cases from GuanHong Liu.
Reviewed by Steve Canon.

Differential Revision: http://reviews.llvm.org/D2804


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@231965 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 29 deletions

diff --git a/lib/builtins/fixunssfdi.c b/lib/builtins/fixunssfdi.c
index 69d5952e9..cd21cfd18 100644
--- a/lib/builtins/fixunssfdi.c
+++ b/lib/builtins/fixunssfdi.c
@@ -6,39 +6,16 @@
  * Source Licenses. See LICENSE.TXT for details.
  *
  * ===----------------------------------------------------------------------===
- *
- * This file implements __fixunssfdi for the compiler_rt library.
- *
- * ===----------------------------------------------------------------------===
- */
-
-#include "int_lib.h"
-/* Returns: convert a to a unsigned long long, rounding toward zero.
- *          Negative values all become zero.
- */
-
-/* Assumption: float is a IEEE 32 bit floating point type 
- *             du_int is a 64 bit integral type
- *             value in float is representable in du_int or is negative 
- *                 (no range checking performed)
  */
 
-/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
+#define SINGLE_PRECISION
+#include "fp_lib.h"
+typedef du_int fixuint_t;
+#include "fp_fixuint_impl.inc"
 
 ARM_EABI_FNALIAS(f2ulz, fixunssfdi)
 
 COMPILER_RT_ABI du_int
-__fixunssfdi(float a)
-{
-    float_bits fb;
-    fb.f = a;
-    int e = ((fb.u & 0x7F800000) >> 23) - 127;
-    if (e < 0 || (fb.u & 0x80000000))
-        return 0;
-    du_int r = (fb.u & 0x007FFFFF) | 0x00800000;
-    if (e > 23)
-        r <<= (e - 23);
-    else
-        r >>= (23 - e);
-    return r;
+__fixunssfdi(fp_t a) {
+    return __fixuint(a);
 }