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a9ee20cb9a
Note: On Windows, where a long double is the same as a double, nextafterl is the same as nextafter, nexttowardl is the same as nexttoward. Also nexttoward is the same as nextafter.
40 lines
1 KiB
C
40 lines
1 KiB
C
/*
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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 nextafterf.
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* COPYRIGHT: Imported from musl libc
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* https://git.musl-libc.org/cgit/musl/tree/src/math/nextafterf.c
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* blob: 75a09f7d1cf115d9a5d5dfeda9b12d42de269904
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* See https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
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*/
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#include "libm.h"
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float nextafterf(float x, float y)
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{
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union {float f; uint32_t i;} ux={x}, uy={y};
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uint32_t ax, ay, e;
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if (isnanf(x) || isnanf(y))
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return x + y;
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if (ux.i == uy.i)
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return y;
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ax = ux.i & 0x7fffffff;
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ay = uy.i & 0x7fffffff;
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if (ax == 0) {
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if (ay == 0)
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return y;
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ux.i = (uy.i & 0x80000000) | 1;
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} else if (ax > ay || ((ux.i ^ uy.i) & 0x80000000))
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ux.i--;
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else
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ux.i++;
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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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