forked from OSchip/llvm-project
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* ===-- fixunsdfdi.c - Implement __fixunsdfdi -----------------------------===
|
|
*
|
|
* 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 __fixunsdfdi 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: double is a IEEE 64 bit floating point type
|
|
* du_int is a 64 bit integral type
|
|
* value in double is representable in du_int or is negative
|
|
* (no range checking performed)
|
|
*/
|
|
|
|
/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
|
|
|
|
ARM_EABI_FNALIAS(d2ulz, fixunsdfdi);
|
|
|
|
COMPILER_RT_ABI du_int
|
|
__fixunsdfdi(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;
|
|
udwords r;
|
|
r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000;
|
|
r.s.low = fb.u.s.low;
|
|
if (e > 52)
|
|
r.all <<= (e - 52);
|
|
else
|
|
r.all >>= (52 - e);
|
|
return r.all;
|
|
}
|