diff options
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 29 |
1 files changed, 28 insertions, 1 deletions
@@ -1216,7 +1216,10 @@ case "$cpu" in cc_i386='$(CC) -m32' ;; x86_64) - CPU_CFLAGS="-m64" + # ??? Only extremely old AMD cpus do not have cmpxchg16b. + # If we truly care, we should simply detect this case at + # runtime and generate the fallback to serial emulation. + CPU_CFLAGS="-m64 -mcx16" LDFLAGS="-m64 $LDFLAGS" cc_i386='$(CC) -m32' ;; @@ -4521,6 +4524,26 @@ if compile_prog "" "" ; then int128=yes fi +######################################### +# See if 128-bit atomic operations are supported. + +atomic128=no +if test "$int128" = "yes"; then + cat > $TMPC << EOF +int main(void) +{ + unsigned __int128 x = 0, y = 0; + y = __atomic_load_16(&x, 0); + __atomic_store_16(&x, y, 0); + __atomic_compare_exchange_16(&x, &y, x, 0, 0, 0); + return 0; +} +EOF + if compile_prog "" "" ; then + atomic128=yes + fi +fi + ######################################## # check if getauxval is available. @@ -5483,6 +5506,10 @@ if test "$int128" = "yes" ; then echo "CONFIG_INT128=y" >> $config_host_mak fi +if test "$atomic128" = "yes" ; then + echo "CONFIG_ATOMIC128=y" >> $config_host_mak +fi + if test "$getauxval" = "yes" ; then echo "CONFIG_GETAUXVAL=y" >> $config_host_mak fi |