first commit of the new libm!

[musl] / src / math / s_remquof.c

diff --git a/src/math/s_remquof.c b/src/math/s_remquof.c
deleted file mode 100644 (file)
index be2a561..0000000
--- a/src/math/s_remquof.c
+++ /dev/null
@@ -1,118 +0,0 @@
-/* @(#)e_fmod.c 1.3 95/01/18 */
-/*-
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunSoft, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice 
- * is preserved.
- * ====================================================
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const float Zero[] = {0.0, -0.0,};
-
-/*
- * Return the IEEE remainder and set *quo to the last n bits of the
- * quotient, rounded to the nearest integer.  We choose n=31 because
- * we wind up computing all the integer bits of the quotient anyway as
- * a side-effect of computing the remainder by the shift and subtract
- * method.  In practice, this is far more bits than are needed to use
- * remquo in reduction algorithms.
- */
-float
-remquof(float x, float y, int *quo)
-{
-        int32_t n,hx,hy,hz,ix,iy,sx,i;
-        uint32_t q,sxy;
-
-        GET_FLOAT_WORD(hx,x);
-        GET_FLOAT_WORD(hy,y);
-        sxy = (hx ^ hy) & 0x80000000;
-        sx = hx&0x80000000;             /* sign of x */
-        hx ^=sx;                /* |x| */
-        hy &= 0x7fffffff;       /* |y| */
-
-    /* purge off exception values */
-        if(hy==0||hx>=0x7f800000||hy>0x7f800000) /* y=0,NaN;or x not finite */
-            return (x*y)/(x*y);
-        if(hx<hy) {
-            q = 0;
-            goto fixup; /* |x|<|y| return x or x-y */
-        } else if(hx==hy) {
-            *quo = 1;
-            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 <<= n;
-        }
-        if(iy >= -126)
-            hy = 0x00800000|(0x007fffff&hy);
-        else {          /* subnormal y, shift y to normal */
-            n = -126-iy;
-            hy <<= n;
-        }
-
-    /* fix point fmod */
-        n = ix - iy;
-        q = 0;
-        while(n--) {
-            hz=hx-hy;
-            if(hz<0) hx = hx << 1;
-            else {hx = hz << 1; q++;}
-            q <<= 1;
-        }
-        hz=hx-hy;
-        if(hz>=0) {hx=hz;q++;}
-
-    /* convert back to floating value and restore the sign */
-        if(hx==0) {                             /* return sign(x)*0 */
-            *quo = (sxy ? -q : q);
-            return Zero[(uint32_t)sx>>31];
-        }
-        while(hx<0x00800000) {          /* normalize x */
-            hx <<= 1;
-            iy -= 1;
-        }
-        if(iy>= -126) {         /* normalize output */
-            hx = ((hx-0x00800000)|((iy+127)<<23));
-        } else {                /* subnormal output */
-            n = -126 - iy;
-            hx >>= n;
-        }
-fixup:
-        SET_FLOAT_WORD(x,hx);
-        y = fabsf(y);
-        if (y < 0x1p-125f) {
-            if (x+x>y || (x+x==y && (q & 1))) {
-                q++;
-                x-=y;
-            }
-        } else if (x>0.5f*y || (x==0.5f*y && (q & 1))) {
-            q++;
-            x-=y;
-        }
-        GET_FLOAT_WORD(hx,x);
-        SET_FLOAT_WORD(x,hx^sx);
-        q &= 0x7fffffff;
-        *quo = (sxy ? -q : q);
-        return x;
-}