mirror of
https://github.com/reactos/reactos.git
synced 2025-07-04 00:51:27 +00:00
45 lines
938 B
C
45 lines
938 B
C
|
/*
|
||
|
|
* PROJECT: ReactOS CRT
|
||
|
|
* LICENSE: MIT (https://spdx.org/licenses/MIT)
|
||
|
|
* PURPOSE: Implementation of scalbn.
|
||
|
|
* COPYRIGHT: Imported from musl nexttowardf
|
||
|
|
* https://git.musl-libc.org/cgit/musl/tree/src/math/nexttowardf.c
|
||
|
|
* blob: bbf172f9e65573e9059d26ea574aa8a96dfdef43
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "libm.h"
|
||
|
|
|
||
|
|
float nexttowardf(float x, long double y)
|
||
|
|
{
|
||
|
|
union {float f; uint32_t i;} ux = {x};
|
||
|
|
uint32_t e;
|
||
|
|
|
||
|
|
if (_isnan(x) || _isnan(y))
|
||
|
|
return x + y;
|
||
|
|
if (x == y)
|
||
|
|
return y;
|
||
|
|
if (x == 0) {
|
||
|
|
ux.i = 1;
|
||
|
|
if (signbit(y))
|
||
|
|
ux.i |= 0x80000000;
|
||
|
|
} else if (x < y) {
|
||
|
|
if (signbit(x))
|
||
|
|
ux.i--;
|
||
|
|
else
|
||
|
|
ux.i++;
|
||
|
|
} else {
|
||
|
|
if (signbit(x))
|
||
|
|
ux.i++;
|
||
|
|
else
|
||
|
|
ux.i--;
|
||
|
|
}
|
||
|
|
e = ux.i & 0x7f800000;
|
||
|
|
/* raise overflow if ux.f is infinite and x is finite */
|
||
|
|
if (e == 0x7f800000)
|
||
|
|
FORCE_EVAL(x+x);
|
||
|
|
/* raise underflow if ux.f is subnormal or zero */
|
||
|
|
if (e == 0)
|
||
|
|
FORCE_EVAL(x*x + ux.f*ux.f);
|
||
|
|
return ux.f;
|
||
|
|
}
|