mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-12-14 03:29:57 +00:00
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is distributed under the University of Illinois Open Source
|
|
* License. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __fixunsdfsi for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#include "int_lib.h"
|
|
|
|
/* Returns: convert a to a unsigned int, rounding toward zero.
|
|
* Negative values all become zero.
|
|
*/
|
|
|
|
/* Assumption: double is a IEEE 64 bit floating point type
|
|
* su_int is a 32 bit integral type
|
|
* value in double is representable in su_int or is negative
|
|
* (no range checking performed)
|
|
*/
|
|
|
|
/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
|
|
|
|
su_int
|
|
__fixunsdfsi(double a)
|
|
{
|
|
double_bits fb;
|
|
fb.f = a;
|
|
int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
|
|
if (e < 0 || (fb.u.s.high & 0x80000000))
|
|
return 0;
|
|
return (
|
|
0x80000000u |
|
|
((fb.u.s.high & 0x000FFFFF) << 11) |
|
|
(fb.u.s.low >> 21)
|
|
) >> (31 - e);
|
|
}
|