| /*- |
| * ==================================================== |
| * 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. |
| * ==================================================== |
| */ |
| |
| /* s_sincosf.c -- float version of s_sincos.c. |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| * Optimized by Bruce D. Evans. |
| * Merged s_sinf.c and s_cosf.c by Steven G. Kargl. |
| */ |
| |
| #include <sys/cdefs.h> |
| __FBSDID("$FreeBSD$"); |
| |
| #include <float.h> |
| |
| #include "math.h" |
| #define INLINE_REM_PIO2F |
| #include "math_private.h" |
| #include "e_rem_pio2f.c" |
| #include "k_sincosf.h" |
| |
| /* Small multiples of pi/2 rounded to double precision. */ |
| static const double |
| p1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ |
| p2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ |
| p3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ |
| p4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ |
| |
| void |
| sincosf(float x, float *sn, float *cs) |
| { |
| float c, s; |
| 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) { |
| *sn = x; /* x with inexact if x != 0 */ |
| *cs = 1; |
| return; |
| } |
| } |
| __kernel_sincosdf(x, sn, cs); |
| return; |
| } |
| |
| if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ |
| if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */ |
| if (hx > 0) { |
| __kernel_sincosdf(x - p1pio2, cs, sn); |
| *cs = -*cs; |
| } else { |
| __kernel_sincosdf(x + p1pio2, cs, sn); |
| *sn = -*sn; |
| } |
| } else { |
| if (hx > 0) |
| __kernel_sincosdf(x - p2pio2, sn, cs); |
| else |
| __kernel_sincosdf(x + p2pio2, sn, cs); |
| *sn = -*sn; |
| *cs = -*cs; |
| } |
| return; |
| } |
| |
| if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ |
| if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */ |
| if (hx > 0) { |
| __kernel_sincosdf(x - p3pio2, cs, sn); |
| *sn = -*sn; |
| } else { |
| __kernel_sincosdf(x + p3pio2, cs, sn); |
| *cs = -*cs; |
| } |
| } else { |
| if (hx > 0) |
| __kernel_sincosdf(x - p4pio2, sn, cs); |
| else |
| __kernel_sincosdf(x + p4pio2, sn, cs); |
| } |
| return; |
| } |
| |
| /* If x = Inf or NaN, then sin(x) = NaN and cos(x) = NaN. */ |
| if (ix >= 0x7f800000) { |
| *sn = x - x; |
| *cs = x - x; |
| return; |
| } |
| |
| /* Argument reduction. */ |
| n = __ieee754_rem_pio2f(x, &y); |
| __kernel_sincosdf(y, &s, &c); |
| |
| switch(n & 3) { |
| case 0: |
| *sn = s; |
| *cs = c; |
| break; |
| case 1: |
| *sn = c; |
| *cs = -s; |
| break; |
| case 2: |
| *sn = -s; |
| *cs = -c; |
| break; |
| default: |
| *sn = -c; |
| *cs = s; |
| } |
| } |
| |
| |