32 lines
863 B
C
32 lines
863 B
C
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#define _GNU_SOURCE
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#include "libc/math/math.h"
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#include "libc/math/libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double exp10l(long double x)
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{
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return exp10(x);
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}
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#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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long double exp10l(long double x)
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{
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static const long double p10[] = {
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1e-15L, 1e-14L, 1e-13L, 1e-12L, 1e-11L, 1e-10L,
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1e-9L, 1e-8L, 1e-7L, 1e-6L, 1e-5L, 1e-4L, 1e-3L, 1e-2L, 1e-1L,
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1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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1e10, 1e11, 1e12, 1e13, 1e14, 1e15
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};
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long double n, y = modfl(x, &n);
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union ldshape u = {n};
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/* fabsl(n) < 16 without raising invalid on nan */
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if ((u.i.se & 0x7fff) < 0x3fff+4) {
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if (!y) return p10[(int)n+15];
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y = exp2l(3.32192809488736234787031942948939L * y);
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return y * p10[(int)n+15];
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}
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return powl(10.0, x);
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}
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#endif
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weak_alias(exp10l, pow10l);
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