mirror of
https://github.com/reactos/reactos.git
synced 2025-07-03 22:41:21 +00:00
41 lines
858 B
C
41 lines
858 B
C
/*
|
|
* PROJECT: ReactOS CRT
|
|
* LICENSE: MIT (https://spdx.org/licenses/MIT)
|
|
* PURPOSE: Implementation of scalbnf.
|
|
* COPYRIGHT: Imported from musl libc
|
|
* https://git.musl-libc.org/cgit/musl/tree/src/math/scalbnf.c
|
|
* blob: a5ad208b69929f24336fae40e6af37101c99a72f
|
|
* See https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
float scalbnf(float x, int n)
|
|
{
|
|
union {float f; uint32_t i;} u;
|
|
float_t y = x;
|
|
|
|
if (n > 127) {
|
|
y *= 0x1p127f;
|
|
n -= 127;
|
|
if (n > 127) {
|
|
y *= 0x1p127f;
|
|
n -= 127;
|
|
if (n > 127)
|
|
n = 127;
|
|
}
|
|
} else if (n < -126) {
|
|
y *= 0x1p-126f * 0x1p24f;
|
|
n += 126 - 24;
|
|
if (n < -126) {
|
|
y *= 0x1p-126f * 0x1p24f;
|
|
n += 126 - 24;
|
|
if (n < -126)
|
|
n = -126;
|
|
}
|
|
}
|
|
u.i = (uint32_t)(0x7f+n)<<23;
|
|
x = y * u.f;
|
|
return x;
|
|
}
|