You've already forked godot
mirror of
https://github.com/godotengine/godot.git
synced 2025-11-04 12:00:25 +00:00
0b3496fb4f
Made possible by EIREXE, xsellier and the SDL team. This commit includes statically linked SDL3 for Windows, Linux and macOS. The vendored copy of SDL3 was setup to only build the required subsystems for gamepad/joystick support, with some patches to be able to make it as minimal as possible and reduce the impact on binary size and code size. Co-authored-by: Álex Román Núñez <eirexe123@gmail.com> Co-authored-by: Xavier Sellier <xsellier@gmail.com> Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#include "SDL_internal.h"
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */
|
|
/* C4723: potential divide by zero. */
|
|
#pragma warning ( disable : 4723 )
|
|
#endif
|
|
|
|
/* __ieee754_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_libm.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 attribute_hidden __ieee754_log10(double x)
|
|
{
|
|
double y,z;
|
|
int32_t i,k,hx;
|
|
u_int32_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 = ((u_int32_t)k&0x80000000)>>31;
|
|
hx = (hx&0x000fffff)|((0x3ff-i)<<20);
|
|
y = (double)(k+i);
|
|
SET_HIGH_WORD(x,hx);
|
|
z = y*log10_2lo + ivln10*__ieee754_log(x);
|
|
return z+y*log10_2hi;
|
|
}
|
|
|
|
/*
|
|
* wrapper log10(X)
|
|
*/
|
|
#ifndef _IEEE_LIBM
|
|
double log10(double x)
|
|
{
|
|
double z = __ieee754_log10(x);
|
|
if (_LIB_VERSION == _IEEE_ || isnan(x))
|
|
return z;
|
|
if (x <= 0.0) {
|
|
if(x == 0.0)
|
|
return __kernel_standard(x, x, 18); /* log10(0) */
|
|
return __kernel_standard(x, x, 19); /* log10(x<0) */
|
|
}
|
|
return z;
|
|
}
|
|
#else
|
|
strong_alias(__ieee754_log10, log10)
|
|
#endif
|
|
libm_hidden_def(log10)
|