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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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13
configure.ac
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@ -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