36 lines
626 B
C
36 lines
626 B
C
#include "libc/math/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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