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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>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#include "SDL_internal.h"
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* scalbln(double x, long n)
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* scalbln(x,n) returns x * 2**n computed by exponent
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* manipulation rather than by actually performing an
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* exponentiation or a multiplication.
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*/
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#include "math_libm.h"
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#include "math_private.h"
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#include <limits.h>
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#ifdef __WATCOMC__ /* Watcom defines huge=__huge */
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#undef huge
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#endif
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static const double
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two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
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twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
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huge = 1.0e+300,
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tiny = 1.0e-300;
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double scalbln(double x, long n)
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{
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int32_t k, hx, lx;
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EXTRACT_WORDS(hx, lx, x);
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k = (hx & 0x7ff00000) >> 20; /* extract exponent */
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if (k == 0) { /* 0 or subnormal x */
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if ((lx | (hx & 0x7fffffff)) == 0)
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return x; /* +-0 */
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x *= two54;
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GET_HIGH_WORD(hx, x);
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k = ((hx & 0x7ff00000) >> 20) - 54;
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}
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if (k == 0x7ff)
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return x + x; /* NaN or Inf */
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k = (int32_t)(k + n);
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if (k > 0x7fe)
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return huge * copysign(huge, x); /* overflow */
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if (n < -50000)
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return tiny * copysign(tiny, x); /* underflow */
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if (k > 0) { /* normal result */
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SET_HIGH_WORD(x, (hx & 0x800fffff) | (k << 20));
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return x;
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}
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if (k <= -54) {
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if (n > 50000) /* in case integer overflow in n+k */
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return huge * copysign(huge, x); /* overflow */
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return tiny * copysign(tiny, x); /* underflow */
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}
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k += 54; /* subnormal result */
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SET_HIGH_WORD(x, (hx & 0x800fffff) | (k << 20));
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return x * twom54;
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}
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libm_hidden_def(scalbln)
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double scalbn(double x, int n)
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{
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return scalbln(x, n);
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}
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libm_hidden_def(scalbn)
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