| 1 | /* |
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| 2 | * Intel i387 specific version. |
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| 3 | * Public domain. |
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| 4 | */ |
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| 5 | |
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| 6 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 7 | static char rcsid[] = "$NetBSD: $" ; |
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| 8 | #endif |
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| 9 | |
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| 10 | /* |
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| 11 | * isinfl(x) returns 1 if x is inf, -1 if x is -inf, else 0; |
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| 12 | * no branching! |
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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 | |
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| 18 | int __isinfl(long double x) |
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| 19 | { |
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| 20 | int32_t se,hx,lx; |
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| 21 | GET_LDOUBLE_WORDS(se,hx,lx,x); |
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| 22 | /* This additional ^ 0x80000000 is necessary because in Intel's |
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| 23 | internal representation of the implicit one is explicit. */ |
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| 24 | lx |= (hx ^ 0x80000000) | ((se & 0x7fff) ^ 0x7fff); |
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| 25 | lx |= -lx; |
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| 26 | se &= 0x8000; |
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| 27 | return ~(lx >> 31) & (1 - (se >> 14)); |
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| 28 | } |
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| 29 | hidden_def (__isinfl) |
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| 30 | weak_alias (__isinfl, isinfl) |
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| 31 | |
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