diff options
Diffstat (limited to 'libc/sysdeps/ieee754/dbl-64/e_fmod.c')
| -rw-r--r-- | libc/sysdeps/ieee754/dbl-64/e_fmod.c | 43 |
1 files changed, 16 insertions, 27 deletions
diff --git a/libc/sysdeps/ieee754/dbl-64/e_fmod.c b/libc/sysdeps/ieee754/dbl-64/e_fmod.c index 2ce613574..a575f616b 100644 --- a/libc/sysdeps/ieee754/dbl-64/e_fmod.c +++ b/libc/sysdeps/ieee754/dbl-64/e_fmod.c @@ -5,16 +5,12 @@ * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice + * software is freely granted, provided that this notice * is preserved. * ==================================================== */ -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: e_fmod.c,v 1.8 1995/05/10 20:45:07 jtc Exp $"; -#endif - -/* +/* * __ieee754_fmod(x,y) * Return x mod y in exact arithmetic * Method: shift and subtract @@ -23,18 +19,10 @@ static char rcsid[] = "$NetBSD: e_fmod.c,v 1.8 1995/05/10 20:45:07 jtc Exp $"; #include "math.h" #include "math_private.h" -#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 __ieee754_fmod(double x, double y) -#else - double __ieee754_fmod(x,y) - double x,y ; -#endif +double +__ieee754_fmod (double x, double y) { int32_t n,hx,hy,hz,ix,iy,sx,i; u_int32_t lx,ly,lz; @@ -51,7 +39,7 @@ static double one = 1.0, Zero[] = {0.0, -0.0,}; return (x*y)/(x*y); if(hx<=hy) { if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */ - if(lx==ly) + if(lx==ly) return Zero[(u_int32_t)sx>>31]; /* |x|=|y| return x*0*/ } @@ -74,25 +62,25 @@ static double one = 1.0, Zero[] = {0.0, -0.0,}; } else iy = (hy>>20)-1023; /* set up {hx,lx}, {hy,ly} and align y to x */ - if(ix >= -1022) + 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; + hx = (hx<<n)|(lx>>(32-n)); + lx <<= n; } else { hx = lx<<(n-32); lx = 0; } } - if(iy >= -1022) + 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; + hy = (hy<<n)|(ly>>(32-n)); + ly <<= n; } else { hy = ly<<(n-32); ly = 0; @@ -105,17 +93,17 @@ static double one = 1.0, Zero[] = {0.0, -0.0,}; 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 */ + if((hz|lz)==0) /* return sign(x)*0 */ return Zero[(u_int32_t)sx>>31]; - hx = hz+hz+(lz>>31); lx = lz+lz; + 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[(u_int32_t)sx>>31]; + if((hx|lx)==0) /* return sign(x)*0 */ + return Zero[(u_int32_t)sx>>31]; while(hx<0x00100000) { /* normalize x */ hx = hx+hx+(lx>>31); lx = lx+lx; iy -= 1; @@ -138,3 +126,4 @@ static double one = 1.0, Zero[] = {0.0, -0.0,}; } return x; /* exact output */ } +strong_alias (__ieee754_fmod, __fmod_finite) |