33 lines
655 B
C
33 lines
655 B
C
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/*
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* Public domain.
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*/
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/*
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* isinf(x) returns 1 is x is inf, -1 if x is -inf, else 0;
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* no branching!
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*/
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#include <math.h>
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#include <math_private.h>
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#include <ldbl-classify-compat.h>
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#include <shlib-compat.h>
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int
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__isinf (double x)
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{
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int64_t ix;
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EXTRACT_WORDS64 (ix,x);
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int64_t t = ix & UINT64_C (0x7fffffffffffffff);
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t ^= UINT64_C (0x7ff0000000000000);
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t |= -t;
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return ~(t >> 63) & (ix >> 62);
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}
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hidden_def (__isinf)
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weak_alias (__isinf, isinf)
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#ifdef NO_LONG_DOUBLE
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# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
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compat_symbol (libc, __isinf, __isinfl, GLIBC_2_0);
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# endif
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weak_alias (__isinf, isinfl)
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#endif
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