/* s_sinf.c -- float version of s_sin.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 * Optimized by Bruce D. Evans.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <float.h>

#include "math.h"
#define INLINE_KERNEL_COSDF
#define INLINE_KERNEL_SINDF
#define INLINE_REM_PIO2F
#include "math_private.h"
#include "e_rem_pio2f.c"
#include "k_cosf.c"
#include "k_sinf.c"

/* Small multiples of pi/2 rounded to double precision. */
static const double
s1pio2 = 1*M_PI_2,          /* 0x3FF921FB, 0x54442D18 */
s2pio2 = 2*M_PI_2,          /* 0x400921FB, 0x54442D18 */
s3pio2 = 3*M_PI_2,          /* 0x4012D97C, 0x7F3321D2 */
s4pio2 = 4*M_PI_2;          /* 0x401921FB, 0x54442D18 */

float
sinf(float x)
{
    double y;
    int32_t n, hx, ix;

    GET_FLOAT_WORD(hx,x);
    ix = hx & 0x7fffffff;

    if (ix <= 0x3f490fda) {     /* |x| ~<= pi/4 */
        if (ix<0x39800000)      /* |x| < 2**-12 */
            if (((int)x)==0) return x;  /* x with inexact if x != 0 */
        return __kernel_sindf(x);
    }
    if (ix<=0x407b53d1) {       /* |x| ~<= 5*pi/4 */
        if (ix<=0x4016cbe3) {   /* |x| ~<= 3pi/4 */
            if (hx>0)
                return __kernel_cosdf(x - s1pio2);
            else
                return -__kernel_cosdf(x + s1pio2);
        } else
            return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
    }
    if (ix<=0x40e231d5) {       /* |x| ~<= 9*pi/4 */
        if (ix<=0x40afeddf) {   /* |x| ~<= 7*pi/4 */
            if (hx>0)
                return -__kernel_cosdf(x - s3pio2);
            else
                return __kernel_cosdf(x + s3pio2);
        } else
            return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
    }

    /* sin(Inf or NaN) is NaN */
    else if (ix>=0x7f800000) return x-x;

    /* general argument reduction needed */
    else {
        n = __ieee754_rem_pio2f(x,&y);
        switch (n&3) {
            case 0:
                return  __kernel_sindf(y);
            case 1:
                return  __kernel_cosdf(y);
            case 2:
                return  __kernel_sindf(-y);
            default:
                return -__kernel_cosdf(y);
        }
    }
}