Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
629 bytes
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Line | |
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1 | /* |
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2 | * isinf(x) returns 1 if x is infinity, else 0; |
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3 | * no branching! |
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4 | * |
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5 | * isinf is a <math.h> macro in the C99 standard. It was previously |
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6 | * implemented as a function by newlib and is declared as such in |
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7 | * <math.h>. Newlib supplies it here as a function if the user |
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8 | * chooses to use it instead of the C99 macro. |
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9 | */ |
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10 | |
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11 | #include "fdlibm.h" |
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12 | #include <ieeefp.h> |
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13 | |
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14 | #ifndef _DOUBLE_IS_32BITS |
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15 | |
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16 | #undef isinf |
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17 | |
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18 | int |
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19 | isinf (double x) |
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20 | { |
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21 | __int32_t hx,lx; |
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22 | EXTRACT_WORDS(hx,lx,x); |
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23 | hx &= 0x7fffffff; |
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24 | hx |= (__uint32_t)(lx|(-lx))>>31; |
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25 | hx = 0x7ff00000 - hx; |
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26 | return 1 - (int)((__uint32_t)(hx|(-hx))>>31); |
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27 | } |
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28 | |
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29 | #endif /* _DOUBLE_IS_32BITS */ |
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