auravulpes/FENIX_libc
1
0
Fork 0
Code Issues 2 Pull requests Projects Releases Wiki Activity

Some rough floating point macros!

Browse source
This commit is contained in:
Kat R. 2022-05-28 11:15:26 -05:00
parent 2ada975628
commit ef5fd0562f
4 changed files with 173 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

47
include/math.h
View file

@ -3,7 +3,7 @@
*
* This header is a part of the FENIX C Library and is free software.
* You can redistribute and/or modify it subject to the terms of the
* Clumsy Wolf Public License v4. For more details, see the file COPYING.
* Clumsy Wolf Public License v5. For more details, see the file COPYING.
*
* The FENIX C Library is distributed WITH NO WARRANTY WHATSOEVER. See
* The CWPL for more details.
@ -12,6 +12,8 @@
#ifndef _MATH_H
#define _MATH_H
#include <limits.h>
#if FLT_EVAL_METHOD == 1
typedef double float_t;
typedef double double_t;
@ -23,6 +25,44 @@ typedef float float_t;
typedef double double_t;
#endif
/* Both of these are basically lifted from musl. */
#define INFINITY (1e5000)
#define NAN (0.0f / 0.0f)
#define FP_INFINITE 1
#define FP_NAN 2
#define FP_NORMAL 3
#define FP_SUBNORMAL 4
#define FP_ZERO 0
int __fpclassifyd(double x);
int __fpclassifyf(float x);
int __fpclassifyl(long double x);
/* We're just gonna use the approach in the C standard here */
#define fpclassify(x) ((sizeof(x) == sizeof(float)) ? __fpclassifyf(x) : \
(sizeof(x) == sizeof(double)) ? __fpclassifyd(x) : \
__fpclassifyl(x))
#define isfinite(x) ((fpclassify(x) != FP_INFINITE) && (fpclassify(x) != FP_NAN))
#define isinf(x) (fpclassify(x) == FP_INFINITE)
#define isnan(x) (fpclassify(x) == FP_NAN)
#define isnormal(x) (fpclassify(x) == FP_NORMAL)
int __signbitd(double x);
int __signbitf(float x);
int __signbitl(long double x);
/*
In theory, I could just use (x < 0 || x == -0.0f), but would that work for
infinity and NaN? I feel like no. So fuck it. We'll just write some small
functions to pull the sign bit straight from the number.
-Kat
*/
#define signbit(x) ((sizeof(x) == sizeof(float)) ? __signbitf(x) : \
(sizeof(x) == sizeof(double)) ? __signbitd(x) : \
__signbitl(x))
#define M_E 2.718281828
#define M_PI 3.14159265
#define PI 3.14159265
@ -40,7 +80,10 @@ typedef double double_t;
#define MATH_ERRNO 1
#define MATH_ERREXCEPT 2
#define math_errhandling (int) (MATH_ERRNO | MATH_ERREXCEPT)
#define math_errhandling MATH_ERRNO
#define FP_ILOGB0 INT_MIN
#define FP_ILOGBNAN INT_MAX
double acos(double);
float acosf(float);