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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
View file

@ -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

2
Misc/NEWS
View file

@ -10,6 +10,8 @@ Release date: TBA
Core and Builtins
-----------------
- Issue #20904: Support setting FPU precision on m68k.
- Issue #21209: Fix sending tuples to custom generator objects with the yield
from syntax.

32
configure vendored
View file

@ -13244,6 +13244,38 @@ $as_echo "#define HAVE_GCC_ASM_FOR_X87 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we can use gcc inline assembler to get and set mc68881 fpcr" >&5
$as_echo_n "checking whether we can use gcc inline assembler to get and set mc68881 fpcr... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
unsigned int fpcr;
__asm__ __volatile__ ("fmove.l %%fpcr,%0" : "=g" (fpcr));
__asm__ __volatile__ ("fmove.l %0,%%fpcr" : : "g" (fpcr));
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
have_gcc_asm_for_mc68881=yes
else
have_gcc_asm_for_mc68881=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_gcc_asm_for_mc68881" >&5
$as_echo "$have_gcc_asm_for_mc68881" >&6; }
if test "$have_gcc_asm_for_mc68881" = yes
then
$as_echo "#define HAVE_GCC_ASM_FOR_MC68881 1" >>confdefs.h
fi
# Detect whether system arithmetic is subject to x87-style double
# rounding issues. The result of this test has little meaning on non
# IEEE 754 platforms. On IEEE 754, test should return 1 if rounding

13
configure.ac
View file

@ -3810,6 +3810,19 @@ then
[Define if we can use gcc inline assembler to get and set x87 control word])
fi
AC_MSG_CHECKING(whether we can use gcc inline assembler to get and set mc68881 fpcr)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
unsigned int fpcr;
__asm__ __volatile__ ("fmove.l %%fpcr,%0" : "=g" (fpcr));
__asm__ __volatile__ ("fmove.l %0,%%fpcr" : : "g" (fpcr));
]])],[have_gcc_asm_for_mc68881=yes],[have_gcc_asm_for_mc68881=no])
AC_MSG_RESULT($have_gcc_asm_for_mc68881)
if test "$have_gcc_asm_for_mc68881" = yes
then
AC_DEFINE(HAVE_GCC_ASM_FOR_MC68881, 1,
[Define if we can use gcc inline assembler to get and set mc68881 fpcr])
fi
# Detect whether system arithmetic is subject to x87-style double
# rounding issues. The result of this test has little meaning on non
# IEEE 754 platforms. On IEEE 754, test should return 1 if rounding

3
pyconfig.h.in
View file

@ -313,6 +313,9 @@
/* Define to 1 if you have the `gamma' function. */
#undef HAVE_GAMMA
/* Define if we can use gcc inline assembler to get and set mc68881 fpcr */
#undef HAVE_GCC_ASM_FOR_MC68881
/* Define if we can use x64 gcc inline assembler */
#undef HAVE_GCC_ASM_FOR_X64