first commit of the new libm!

thanks to the hard work of Szabolcs Nagy (nsz), identifying the best
(from correctness and license standpoint) implementations from freebsd
and openbsd and cleaning them up! musl should now fully support c99
float and long double math functions, and has near-complete complex
math support. tgmath should also work (fully on gcc-compatible
compilers, and mostly on any c99 compiler).

based largely on commit 0376d44a890fea261506f1fc63833e7a686dca19 from
nsz's libm git repo, with some additions (dummy versions of a few
missing long double complex functions, etc.) by me.

various cleanups still need to be made, including re-adding (if
they're correct) some asm functions that were dropped.

1 files changed, 0 insertions, 129 deletions

diff --git a/src/math/e_fmod.c b/src/math/e_fmod.c
deleted file mode 100644
index 99afe489..00000000
--- a/src/math/e_fmod.c
+++ /dev/null
@@ -1,129 +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.
- * ====================================================
- */
-
-/* 
- * fmod(x,y)
- * Return x mod y in exact arithmetic
- * Method: shift and subtract
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const double one = 1.0, Zero[] = {0.0, -0.0,};
-
-double
-fmod(double x, double y)
-{
-        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 */
-}