/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8                                   :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│                                                                              │
│  Musl Libc                                                                   │
│  Copyright © 2005-2014 Rich Felker, et al.                                   │
│                                                                              │
│  Permission is hereby granted, free of charge, to any person obtaining       │
│  a copy of this software and associated documentation files (the             │
│  "Software"), to deal in the Software without restriction, including         │
│  without limitation the rights to use, copy, modify, merge, publish,         │
│  distribute, sublicense, and/or sell copies of the Software, and to          │
│  permit persons to whom the Software is furnished to do so, subject to       │
│  the following conditions:                                                   │
│                                                                              │
│  The above copyright notice and this permission notice shall be              │
│  included in all copies or substantial portions of the Software.             │
│                                                                              │
│  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,             │
│  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF          │
│  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.      │
│  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY        │
│  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,        │
│  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE           │
│  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
│                                                                              │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/math.h"
#include "libc/runtime/fenv.h"
#include "libc/tinymath/internal.h"
__static_yoink("musl_libc_notice");

#if FLT_EVAL_METHOD==0
#define EPS FLT_EPSILON
#elif FLT_EVAL_METHOD==1
#define EPS DBL_EPSILON
#elif FLT_EVAL_METHOD==2
#define EPS LDBL_EPSILON
#endif
static const float_t toint = 1/EPS;

/**
 * Rounds 𝑥 to nearest integer, away from zero.
 */
float roundf(float x)
{
#ifdef __aarch64__

	asm("frinta\t%s0,%s1" : "=w"(x) : "w"(x));
	return x;

#elif defined(__powerpc64__) && defined(_ARCH_PWR5X)

	asm("frin\t%0,%1" : "=f"(x) : "f"(x));
	return x;

#elif defined(__s390x__) && (defined(__HTM__) || __ARCH__ >= 9)

	asm("fiebra\t%0,1,%1,4" : "=f"(x) : "f"(x));
	return x;

#else

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

	if (e >= 0x7f+23)
		return x;
	if (u.i >> 31)
		x = -x;
	if (e < 0x7f-1) {
		FORCE_EVAL(x + toint);
		return 0*u.f;
	}
	y = x + toint - toint - x;
	if (y > 0.5f)
		y = y + x - 1;
	else if (y <= -0.5f)
		y = y + x + 1;
	else
		y = y + x;
	if (u.i >> 31)
		y = -y;
	return y;

#endif /* __aarch64__ */
}
