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Issue #7117 (backport py3k float repr) continued:

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- add double endianness detection to configure script
 - add configure-time check to see whether we can use inline
   assembly to get and set x87 control word in configure script
 - add functions to get and set x87 control word in Python/pymath.c
 - add pyport.h logic to determine whether it's safe to use the
   short float repr or not
This commit is contained in:
Mark Dickinson 2009-10-24 13:28:38 +00:00
parent 5e9f6676ea
commit 1d6e2e1833
8 changed files with 529 additions and 11 deletions
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18
Python/pymath.c
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@ -13,6 +13,24 @@ double _Py_force_double(double x)
}
#endif
#ifdef HAVE_GCC_ASM_FOR_X87
/* inline assembly for getting and setting the 387 FPU control word on
gcc/x86 */
unsigned short _Py_get_387controlword(void) {
unsigned short cw;
__asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
return cw;
}
void _Py_set_387controlword(unsigned short cw) {
__asm__ __volatile__ ("fldcw %0" : : "m" (cw));
}
#endif
#ifndef HAVE_HYPOT
double hypot(double x, double y)
{