File: nearbyintf.c

package info (click to toggle)
micropython 1.26.1%2Bds-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 50,196 kB
  • sloc: ansic: 324,551; python: 63,215; xml: 4,241; makefile: 3,618; sh: 1,586; javascript: 754; asm: 723; cpp: 83; exp: 11; pascal: 6
file content (21 lines) | stat: -rw-r--r-- 353 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
// adapted from the rintf() function from musl-1.1.16

#include "libm.h"

float nearbyintf(float x)
{
	union {float f; uint32_t i;} u = {x};
	int e = u.i>>23 & 0xff;
	int s = u.i>>31;
	float_t y;

	if (e >= 0x7f+23)
		return x;
	if (s)
		y = x - 0x1p23f + 0x1p23f;
	else
		y = x + 0x1p23f - 0x1p23f;
	if (y == 0)
		return s ? -0.0f : 0.0f;
	return y;
}