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32 lines
737 B
32 lines
737 B
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#ifndef __FENV_POLYFILL_H__ |
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#define __FENV_POLYFILL_H__ |
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#if (defined __APPLE__) && (defined(__i386__) || defined(__x86_64__)) |
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#include <fenv.h> |
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// Public domain polyfill for feenableexcept on OS X |
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// http://www-personal.umich.edu/~williams/archive/computation/fe-handling-example.c |
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inline int |
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feenableexcept (unsigned int excepts) |
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{ |
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static fenv_t fenv; |
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unsigned int new_excepts = excepts & FE_ALL_EXCEPT, |
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old_excepts; // previous masks |
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if ( fegetenv (&fenv) ) return -1; |
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old_excepts = fenv.__control & FE_ALL_EXCEPT; |
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// unmask |
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fenv.__control &= ~new_excepts; |
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fenv.__mxcsr &= ~(new_excepts << 7); |
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return ( fesetenv (&fenv) ? -1 : old_excepts ); |
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} |
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#endif // APPLE |
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#endif // __FENV_POLYFILL_H__ |
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