On Sat, Oct 24, 2020 at 12:31:43PM -0500, Segher Boessenkool wrote:
> On Sat, Oct 24, 2020 at 02:59:34PM +1030, Alan Modra wrote:
> > Those instructions aren't generated, we don't see them anywhere on a
> > power10 all-lang bootstrap except in one testcase designed to exercise
> > them.
>
> But that is completely not relevant :-)
>
> If you use a macro that doesn't exist, the compiler simply does not
> build!
My empirical evidence to the contrary says your theoretical arguments
are invalid. :-)
$ gcc/xgcc -Bgcc/ -S
~/src/gcc/gcc/testsuite/gcc.target/powerpc/vsx_mask-count-runnable.c -O2
-mcpu=power10
$ grep VSX_MM vsx_mask-count-runnable.s
vcntmb<VSX_MM_SUFFIX> 9,0,1
vcntmb<VSX_MM_SUFFIX> 9,0,1
vcntmb<VSX_MM_SUFFIX> 9,0,1
vcntmb<VSX_MM_SUFFIX> 9,0,1
--
Alan Modra
Australia Development Lab, IBM
