f34428eb35
* cpu_features.c: New file. * cpu_features.h: New file. * crt1.c: Include "cpu_features.h". (__mingw_CRTStartup): Call cpu_features_init(). * Makefile.in (MING_OBJS): Add cpu_features.c. (SRCDIST_FILES): Add cpu_features.c, cpu_features.h. * include/fenv,h ( fenv_t;): Append __mxcsr field. (__MXCSR_EXCEPT_FLAG_SHIFT): New define. (__MXCSR_EXCEPT_MASK_SHIFT): New define. (__MXCSR_ROUND_FLAG_SHIFT): New define. * mingwex/feclearexcept.c: Include "cpu_features.h". Handle SSE environment. * mingwex/fegetenv.c: Likewise. * mingwex/feholdexcept.c: Likewise. * mingwex/fesetenv.c: Likewise. * mingwex/fesetexceptflag.c: Likewise. * mingwex/fesetround.c: Likewise. * mingwex/fetestexcept.c: Likewise. * mingwex/feupdateenv.c: Likewise. * mingwex/fegetround.c: Add comment.
28 lines
759 B
C
28 lines
759 B
C
#include <fenv.h>
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#include "cpu_features.h"
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/* 7.6.2.5
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The fetestexcept function determines which of a specified subset of
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the exception flags are currently set. The excepts argument
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specifies the exception flags to be queried.
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The fetestexcept function returns the value of the bitwise OR of the
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exception macros corresponding to the currently set exceptions
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included in excepts. */
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int fetestexcept (int excepts)
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{
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unsigned int _res;
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__asm__ ("fnstsw %%ax" : "=a" (_res));
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/* If SSE supported, return the union of the FPU and SSE flags. */
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if (__HAS_SSE)
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{
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unsigned int _csr;
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__asm__ volatile("stmxcsr %0" : "=m" (_csr));
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_res |= _csr;
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}
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return (_res & excepts & FE_ALL_EXCEPT);
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}
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