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first commit of the new libm!

Browse source 
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.
This commit is contained in:
Rich Felker 2012-03-13 01:17:53 -04:00
commit b69f695ace
378 changed files with 20552 additions and 7743 deletions
Download patch file Download diff file Expand all files Collapse all files

23
src/stdlib/frexp.c
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@ -1,23 +0,0 @@
#include <math.h>
#include <inttypes.h>
double frexp(double x, int *e)
{
union { double d; uint64_t i; } y = { x };
int ee = y.i>>52 & 0x7ff;
if (!ee) {
if (x) {
x = frexp(x*0x1p64, e);
*e -= 64;
} else *e = 0;
return x;
} else if (ee == 0x7ff) {
return x;
}
*e = ee - 0x3fe;
y.i &= 0x800fffffffffffffull;
y.i |= 0x3fe0000000000000ull;
return y.d;
}

23
src/stdlib/frexpf.c
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@ -1,23 +0,0 @@
#include <math.h>
#include <inttypes.h>
float frexpf(float x, int *e)
{
union { float f; uint32_t i; } y = { x };
int ee = y.i>>23 & 0xff;
if (!ee) {
if (x) {
x = frexpf(x*0x1p64, e);
*e -= 64;
} else *e = 0;
return x;
} else if (ee == 0xff) {
return x;
}
*e = ee - 0x7e;
y.i &= 0x807ffffful;
y.i |= 0x3f000000ul;
return y.f;
}

37
src/stdlib/frexpl.c
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@ -1,37 +0,0 @@
#include <math.h>
#include <inttypes.h>
#include <float.h>
#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
/* This version is for 80-bit little endian long double */
long double frexpl(long double x, int *e)
{
union { long double ld; uint16_t hw[5]; } y = { x };
int ee = y.hw[4]&0x7fff;
if (!ee) {
if (x) {
x = frexpl(x*0x1p64, e);
*e -= 64;
} else *e = 0;
return x;
} else if (ee == 0x7fff) {
return x;
}
*e = ee - 0x3ffe;
y.hw[4] &= 0x8000;
y.hw[4] |= 0x3ffe;
return y.ld;
}
#else
long double frexpl(long double x, int *e)
{
return frexp(x, e);
}
#endif