On Sun, Oct 25, 2020 at 11:55:39AM +1030, Alan Modra wrote: > 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
Oh, wow. How unexpected (to me, anyway). I'll open a PR. Segher
