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tcg: Split CONFIG_ATOMIC128

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GCC7+ will no longer advertise support for 16-byte __atomic operations
if only cmpxchg is supported, as for x86_64.  Fortunately, x86_64 still
has support for __sync_compare_and_swap_16 and we can make use of that.
AArch64 does not have, nor ever has had such support, so open-code it.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-08-15 16:31:47 -07:00
parent 383beda9cf
commit e6cd4bb59b
7 changed files with 213 additions and 14 deletions
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19
configure vendored
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@ -5154,6 +5154,21 @@ EOF
fi
fi
cmpxchg128=no
if test "$int128" = yes -a "$atomic128" = no; then
cat > $TMPC << EOF
int main(void)
{
unsigned __int128 x = 0, y = 0;
__sync_val_compare_and_swap_16(&x, y, x);
return 0;
}
EOF
if compile_prog "" "" ; then
cmpxchg128=yes
fi
fi
#########################################
# See if 64-bit atomic operations are supported.
# Note that without __atomic builtins, we can only
@ -6663,6 +6678,10 @@ if test "$atomic128" = "yes" ; then
echo "CONFIG_ATOMIC128=y" >> $config_host_mak
fi
if test "$cmpxchg128" = "yes" ; then
echo "CONFIG_CMPXCHG128=y" >> $config_host_mak
fi
if test "$atomic64" = "yes" ; then
echo "CONFIG_ATOMIC64=y" >> $config_host_mak
fi