37 lines
719 B
C
37 lines
719 B
C
#include "libc/limits.h"
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#include "libc/math/fenv.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 long llrintl(long double x)
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{
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return llrint(x);
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}
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#elif defined(FE_INEXACT)
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/*
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see comments in lrint.c
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Note that if LLONG_MAX == 0x7fffffffffffffff && LDBL_MANT_DIG == 64
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then x == 2**63 - 0.5 is the only input that overflows and
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raises inexact (with tonearest or upward rounding mode)
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*/
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long long llrintl(long double x)
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{
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#pragma STDC FENV_ACCESS ON
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int e;
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e = fetestexcept(FE_INEXACT);
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x = rintl(x);
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if (!e && (x > LLONG_MAX || x < LLONG_MIN))
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feclearexcept(FE_INEXACT);
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/* conversion */
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return x;
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}
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#else
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long long llrintl(long double x)
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{
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return rintl(x);
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}
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#endif
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