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, 83 deletions

diff --git a/src/math/e_log10.c b/src/math/e_log10.c
deleted file mode 100644
index 3be179f7..00000000
--- a/src/math/e_log10.c
+++ /dev/null
@@ -1,83 +0,0 @@
-
-/* @(#)e_log10.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.
- * ====================================================
- */
-
-/* log10(x)
- * Return the base 10 logarithm of x
- * 
- * Method :
- *      Let log10_2hi = leading 40 bits of log10(2) and
- *          log10_2lo = log10(2) - log10_2hi,
- *          ivln10   = 1/log(10) rounded.
- *      Then
- *              n = ilogb(x), 
- *              if(n<0)  n = n+1;
- *              x = scalbn(x,-n);
- *              log10(x) := n*log10_2hi + (n*log10_2lo + ivln10*log(x))
- *
- * Note 1:
- *      To guarantee log10(10**n)=n, where 10**n is normal, the rounding 
- *      mode must set to Round-to-Nearest.
- * Note 2:
- *      [1/log(10)] rounded to 53 bits has error  .198   ulps;
- *      log10 is monotonic at all binary break points.
- *
- * Special cases:
- *      log10(x) is NaN with signal if x < 0; 
- *      log10(+INF) is +INF with no signal; log10(0) is -INF with signal;
- *      log10(NaN) is that NaN with no signal;
- *      log10(10**N) = N  for N=0,1,...,22.
- *
- * Constants:
- * The hexadecimal values are the intended ones for the following constants.
- * The decimal values may be used, provided that the compiler will convert
- * from decimal to binary accurately enough to produce the hexadecimal values
- * shown.
- */
-
-#include <math.h>
-#include "math_private.h"
-
-static const double
-two54      =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
-ivln10     =  4.34294481903251816668e-01, /* 0x3FDBCB7B, 0x1526E50E */
-log10_2hi  =  3.01029995663611771306e-01, /* 0x3FD34413, 0x509F6000 */
-log10_2lo  =  3.69423907715893078616e-13; /* 0x3D59FEF3, 0x11F12B36 */
-
-static const double zero   =  0.0;
-
-double
-log10(double x)
-{
-        double y,z;
-        int32_t i,k,hx;
-        uint32_t lx;
-
-        EXTRACT_WORDS(hx,lx,x);
-
-        k=0;
-        if (hx < 0x00100000) {                  /* x < 2**-1022  */
-            if (((hx&0x7fffffff)|lx)==0)
-                return -two54/zero;             /* log(+-0)=-inf */
-            if (hx<0) return (x-x)/zero;        /* log(-#) = NaN */
-            k -= 54; x *= two54; /* subnormal number, scale up x */
-            GET_HIGH_WORD(hx,x);
-        }
-        if (hx >= 0x7ff00000) return x+x;
-        k += (hx>>20)-1023;
-        i  = ((uint32_t)k&0x80000000)>>31;
-        hx = (hx&0x000fffff)|((0x3ff-i)<<20);
-        y  = (double)(k+i);
-        SET_HIGH_WORD(x,hx);
-        z  = y*log10_2lo + ivln10*log(x);
-        return  z+y*log10_2hi;
-}