diff options
Diffstat (limited to 'newlib/libm/mathfp/s_fmod.c')
| -rw-r--r-- | newlib/libm/mathfp/s_fmod.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/newlib/libm/mathfp/s_fmod.c b/newlib/libm/mathfp/s_fmod.c deleted file mode 100644 index ec86376af..000000000 --- a/newlib/libm/mathfp/s_fmod.c +++ /dev/null @@ -1,187 +0,0 @@ - -/* @(#)z_fmod.c 1.0 98/08/13 */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -/* -FUNCTION -<<fmod>>, <<fmodf>>---floating-point remainder (modulo) - -INDEX -fmod -INDEX -fmodf - -ANSI_SYNOPSIS -#include <math.h> -double fmod(double <[x]>, double <[y]>) -float fmodf(float <[x]>, float <[y]>) - -TRAD_SYNOPSIS -#include <math.h> -double fmod(<[x]>, <[y]>) -double (<[x]>, <[y]>); - -float fmodf(<[x]>, <[y]>) -float (<[x]>, <[y]>); - -DESCRIPTION -The <<fmod>> and <<fmodf>> functions compute the floating-point -remainder of <[x]>/<[y]> (<[x]> modulo <[y]>). - -RETURNS -The <<fmod>> function returns the value -@ifnottex -<[x]>-<[i]>*<[y]>, -@end ifnottex -@tex -$x-i\times y$, -@end tex -for the largest integer <[i]> such that, if <[y]> is nonzero, the -result has the same sign as <[x]> and magnitude less than the -magnitude of <[y]>. - -<<fmod(<[x]>,0)>> returns NaN, and sets <<errno>> to <<EDOM>>. - -You can modify error treatment for these functions using <<matherr>>. - -PORTABILITY -<<fmod>> is ANSI C. <<fmodf>> is an extension. -*/ - -/* - * fmod(x,y) - * Return x mod y in exact arithmetic - * Method: shift and subtract - */ - -#include "fdlibm.h" -#include "zmath.h" - -#ifndef _DOUBLE_IS_32BITS - -#ifdef __STDC__ -static const double one = 1.0, Zero[] = {0.0, -0.0,}; -#else -static double one = 1.0, Zero[] = {0.0, -0.0,}; -#endif - -#ifdef __STDC__ - double fmod(double x, double y) -#else - double fmod(x,y) - double x,y ; -#endif -{ - __int32_t n,hx,hy,hz,ix,iy,sx,i; - __uint32_t lx,ly,lz; - - EXTRACT_WORDS(hx,lx,x); - EXTRACT_WORDS(hy,ly,y); - sx = hx&0x80000000; /* sign of x */ - hx ^=sx; /* |x| */ - hy &= 0x7fffffff; /* |y| */ - - /* purge off exception values */ - if((hy|ly)==0||(hx>=0x7ff00000)|| /* y=0,or x not finite */ - ((hy|((ly|-ly)>>31))>0x7ff00000)) /* or y is NaN */ - return (x*y)/(x*y); - if(hx<=hy) { - if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */ - if(lx==ly) - return Zero[(__uint32_t)sx>>31]; /* |x|=|y| return x*0*/ - } - - /* determine ix = ilogb(x) */ - if(hx<0x00100000) { /* subnormal x */ - if(hx==0) { - for (ix = -1043, i=lx; i>0; i<<=1) ix -=1; - } else { - for (ix = -1022,i=(hx<<11); i>0; i<<=1) ix -=1; - } - } else ix = (hx>>20)-1023; - - /* determine iy = ilogb(y) */ - if(hy<0x00100000) { /* subnormal y */ - if(hy==0) { - for (iy = -1043, i=ly; i>0; i<<=1) iy -=1; - } else { - for (iy = -1022,i=(hy<<11); i>0; i<<=1) iy -=1; - } - } else iy = (hy>>20)-1023; - - /* set up {hx,lx}, {hy,ly} and align y to x */ - if(ix >= -1022) - hx = 0x00100000|(0x000fffff&hx); - else { /* subnormal x, shift x to normal */ - n = -1022-ix; - if(n<=31) { - hx = (hx<<n)|(lx>>(32-n)); - lx <<= n; - } else { - hx = lx<<(n-32); - lx = 0; - } - } - if(iy >= -1022) - hy = 0x00100000|(0x000fffff&hy); - else { /* subnormal y, shift y to normal */ - n = -1022-iy; - if(n<=31) { - hy = (hy<<n)|(ly>>(32-n)); - ly <<= n; - } else { - hy = ly<<(n-32); - ly = 0; - } - } - - /* fix point fmod */ - n = ix - iy; - while(n--) { - hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1; - if(hz<0){hx = hx+hx+(lx>>31); lx = lx+lx;} - else { - if((hz|lz)==0) /* return sign(x)*0 */ - return Zero[(__uint32_t)sx>>31]; - hx = hz+hz+(lz>>31); lx = lz+lz; - } - } - hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1; - if(hz>=0) {hx=hz;lx=lz;} - - /* convert back to floating value and restore the sign */ - if((hx|lx)==0) /* return sign(x)*0 */ - return Zero[(__uint32_t)sx>>31]; - while(hx<0x00100000) { /* normalize x */ - hx = hx+hx+(lx>>31); lx = lx+lx; - iy -= 1; - } - if(iy>= -1022) { /* normalize output */ - hx = ((hx-0x00100000)|((iy+1023)<<20)); - INSERT_WORDS(x,hx|sx,lx); - } else { /* subnormal output */ - n = -1022 - iy; - if(n<=20) { - lx = (lx>>n)|((__uint32_t)hx<<(32-n)); - hx >>= n; - } else if (n<=31) { - lx = (hx<<(32-n))|(lx>>n); hx = sx; - } else { - lx = hx>>(n-32); hx = sx; - } - INSERT_WORDS(x,hx|sx,lx); - x *= one; /* create necessary signal */ - } - return x; /* exact output */ -} - -#endif /* defined(_DOUBLE_IS_32BITS) */ |