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45 lines
938 B
C
45 lines
938 B
C
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/*
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* PROJECT: ReactOS CRT
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: Implementation of scalbn.
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* COPYRIGHT: Imported from musl nexttowardf
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* https://git.musl-libc.org/cgit/musl/tree/src/math/nexttowardf.c
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* blob: bbf172f9e65573e9059d26ea574aa8a96dfdef43
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*/
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#include "libm.h"
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float nexttowardf(float x, long double y)
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{
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union {float f; uint32_t i;} ux = {x};
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uint32_t e;
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if (_isnan(x) || _isnan(y))
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return x + y;
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if (x == y)
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return y;
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if (x == 0) {
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ux.i = 1;
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if (signbit(y))
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ux.i |= 0x80000000;
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} else if (x < y) {
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if (signbit(x))
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ux.i--;
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else
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ux.i++;
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} else {
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if (signbit(x))
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ux.i++;
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else
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ux.i--;
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}
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e = ux.i & 0x7f800000;
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/* raise overflow if ux.f is infinite and x is finite */
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if (e == 0x7f800000)
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FORCE_EVAL(x+x);
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/* raise underflow if ux.f is subnormal or zero */
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if (e == 0)
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FORCE_EVAL(x*x + ux.f*ux.f);
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return ux.f;
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}
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