summaryrefslogtreecommitdiff
path: root/src/math/e_fmodf.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/math/e_fmodf.c')
-rw-r--r--src/math/e_fmodf.c101
1 files changed, 0 insertions, 101 deletions
diff --git a/src/math/e_fmodf.c b/src/math/e_fmodf.c
deleted file mode 100644
index fe86cb04..00000000
--- a/src/math/e_fmodf.c
+++ /dev/null
@@ -1,101 +0,0 @@
-/* e_fmodf.c -- float version of e_fmod.c.
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
-
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-/*
- * fmodf(x,y)
- * Return x mod y in exact arithmetic
- * Method: shift and subtract
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const float one = 1.0, Zero[] = {0.0, -0.0,};
-
-float
-fmodf(float x, float y)
-{
- int32_t n,hx,hy,hz,ix,iy,sx,i;
-
- GET_FLOAT_WORD(hx,x);
- GET_FLOAT_WORD(hy,y);
- sx = hx&0x80000000; /* sign of x */
- hx ^=sx; /* |x| */
- hy &= 0x7fffffff; /* |y| */
-
- /* purge off exception values */
- if(hy==0||(hx>=0x7f800000)|| /* y=0,or x not finite */
- (hy>0x7f800000)) /* or y is NaN */
- return (x*y)/(x*y);
- if(hx<hy) return x; /* |x|<|y| return x */
- if(hx==hy)
- return Zero[(uint32_t)sx>>31]; /* |x|=|y| return x*0*/
-
- /* determine ix = ilogb(x) */
- if(hx<0x00800000) { /* subnormal x */
- for (ix = -126,i=(hx<<8); i>0; i<<=1) ix -=1;
- } else ix = (hx>>23)-127;
-
- /* determine iy = ilogb(y) */
- if(hy<0x00800000) { /* subnormal y */
- for (iy = -126,i=(hy<<8); i>=0; i<<=1) iy -=1;
- } else iy = (hy>>23)-127;
-
- /* set up {hx,lx}, {hy,ly} and align y to x */
- if(ix >= -126)
- hx = 0x00800000|(0x007fffff&hx);
- else { /* subnormal x, shift x to normal */
- n = -126-ix;
- hx = hx<<n;
- }
- if(iy >= -126)
- hy = 0x00800000|(0x007fffff&hy);
- else { /* subnormal y, shift y to normal */
- n = -126-iy;
- hy = hy<<n;
- }
-
- /* fix point fmod */
- n = ix - iy;
- while(n--) {
- hz=hx-hy;
- if(hz<0){hx = hx+hx;}
- else {
- if(hz==0) /* return sign(x)*0 */
- return Zero[(uint32_t)sx>>31];
- hx = hz+hz;
- }
- }
- hz=hx-hy;
- if(hz>=0) {hx=hz;}
-
- /* convert back to floating value and restore the sign */
- if(hx==0) /* return sign(x)*0 */
- return Zero[(uint32_t)sx>>31];
- while(hx<0x00800000) { /* normalize x */
- hx = hx+hx;
- iy -= 1;
- }
- if(iy>= -126) { /* normalize output */
- hx = ((hx-0x00800000)|((iy+127)<<23));
- SET_FLOAT_WORD(x,hx|sx);
- } else { /* subnormal output */
- n = -126 - iy;
- hx >>= n;
- SET_FLOAT_WORD(x,hx|sx);
- x *= one; /* create necessary signal */
- }
- return x; /* exact output */
-}