| 1 | /* |
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| 2 | * Public domain. |
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| 3 | */ |
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| 4 | |
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| 5 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 6 | static char rcsid[] = "$NetBSD: $" ; |
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| 7 | #endif |
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| 8 | |
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| 9 | /* |
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| 10 | * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0; |
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| 11 | * no branching! |
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| 12 | * slightly dodgy in relying on signed shift right copying sign bit |
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| 13 | */ |
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| 14 | |
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| 15 | #include <math.h> |
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| 16 | #include <math_private.h> |
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| 17 | #include <math_ldbl_opt.h> |
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| 18 | |
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| 19 | int |
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| 20 | ___isinfl (long double x) |
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| 21 | { |
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| 22 | double xhi; |
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| 23 | int64_t hx, mask; |
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| 24 | |
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| 25 | xhi = ldbl_high (x); |
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| 26 | EXTRACT_WORDS64 (hx, xhi); |
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| 27 | |
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| 28 | mask = (hx & 0x7fffffffffffffffLL) ^ 0x7ff0000000000000LL; |
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| 29 | mask |= -mask; |
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| 30 | mask >>= 63; |
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| 31 | return ~mask & (hx >> 62); |
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| 32 | } |
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| 33 | hidden_ver (___isinfl, __isinfl) |
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| 34 | #if !IS_IN (libm) |
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| 35 | weak_alias (___isinfl, ____isinfl) |
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| 36 | long_double_symbol (libc, ___isinfl, isinfl); |
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| 37 | long_double_symbol (libc, ____isinfl, __isinfl); |
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| 38 | #endif |
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| 39 | |
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