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48 lines
1.1 KiB
48 lines
1.1 KiB
#pragma once |
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#include_next <fenv.h> |
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#if defined(__APPLE__) && defined(__MACH__) |
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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 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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// previous masks |
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unsigned int old_excepts; |
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if (fegetenv(&fenv)) { |
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return -1; |
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} |
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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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inline int fedisableexcept(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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// all previous masks |
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unsigned int old_excepts; |
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if (fegetenv(&fenv)) { |
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return -1; |
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} |
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old_excepts = fenv.__control & FE_ALL_EXCEPT; |
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// mask |
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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
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