52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
|
/* clang-format off */
|
||
|
|
/* ===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===
|
||
|
|
*
|
||
|
|
* 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 __fixxfdi for the compiler_rt library.
|
||
|
|
*
|
||
|
|
* ===----------------------------------------------------------------------===
|
||
|
|
*/
|
||
|
|
|
||
|
|
STATIC_YOINK("huge_compiler_rt_license");
|
||
|
|
|
||
|
|
#if !_ARCH_PPC
|
||
|
|
|
||
|
|
#include "third_party/compiler_rt/int_lib.h"
|
||
|
|
|
||
|
|
/* Returns: convert a to a signed long long, rounding toward zero. */
|
||
|
|
|
||
|
|
/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
|
||
|
|
* di_int is a 64 bit integral type
|
||
|
|
* value in long double is representable in di_int (no range checking performed)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
|
||
|
|
* 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
|
||
|
|
*/
|
||
|
|
|
||
|
|
COMPILER_RT_ABI di_int
|
||
|
|
__fixxfdi(long double a)
|
||
|
|
{
|
||
|
|
const di_int di_max = (di_int)((~(du_int)0) / 2);
|
||
|
|
const di_int di_min = -di_max - 1;
|
||
|
|
long_double_bits fb;
|
||
|
|
fb.f = a;
|
||
|
|
int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
|
||
|
|
if (e < 0)
|
||
|
|
return 0;
|
||
|
|
if ((unsigned)e >= sizeof(di_int) * CHAR_BIT)
|
||
|
|
return a > 0 ? di_max : di_min;
|
||
|
|
di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
|
||
|
|
di_int r = fb.u.low.all;
|
||
|
|
r = (du_int)r >> (63 - e);
|
||
|
|
return (r ^ s) - s;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* !_ARCH_PPC */
|