| /* 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); |
| } |
| } |
| } |
