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.
20 lines
461 B
C
20 lines
461 B
C
#include <fenv.h>
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#include "cpu_features.h"
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/* 7.6.3.1
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The fegetround function returns the value of the rounding direction
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macro representing the current rounding direction. */
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int
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fegetround (void)
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{
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unsigned short _cw;
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__asm__ ("fnstcw %0;" : "=m" (_cw));
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/* If the MXCSR flag is different, there is no way to indicate, so just
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report the FPU flag. */
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return _cw
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& (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO);
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}
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