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support setting fpu precision on m68k (closes #20904)

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Patch from Andreas Schwab.
This commit is contained in:
Benjamin Peterson 2014-04-17 00:00:31 -04:00
parent aedff520ea
commit 8bdeb1672c
5 changed files with 69 additions and 0 deletions
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19
Include/pyport.h
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@ -588,6 +588,25 @@ extern "C" {
} while (0)
#endif
#ifdef HAVE_GCC_ASM_FOR_MC68881
#define HAVE_PY_SET_53BIT_PRECISION 1
#define _Py_SET_53BIT_PRECISION_HEADER \
unsigned int old_fpcr, new_fpcr
#define _Py_SET_53BIT_PRECISION_START \
do { \
__asm__ ("fmove.l %%fpcr,%0" : "=g" (old_fpcr)); \
/* Set double precision / round to nearest. */ \
new_fpcr = (old_fpcr & ~0xf0) | 0x80; \
if (new_fpcr != old_fpcr) \
__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (new_fpcr)); \
} while (0)
#define _Py_SET_53BIT_PRECISION_END \
do { \
if (new_fpcr != old_fpcr) \
__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (old_fpcr)); \
} while (0)
#endif
/* default definitions are empty */
#ifndef HAVE_PY_SET_53BIT_PRECISION
#define _Py_SET_53BIT_PRECISION_HEADER