On Fri, 2016-29-04 at 22:29:27 UTC, Unknown sender due to SPF wrote: > In create_zero_mask() we have: > > addi %1,%2,-1 > andc %1,%1,%2 > popcntd %0,%1 > > using the "r" constraint for %2. r0 is a valid register in the "r" set, > but addi X,r0,X turns it into an li: > > li r7,-1 > andc r7,r7,r0 > popcntd r4,r7 > > Fix this by using the "b" constraint, for which r0 is not a valid > register. > > This was found with a kernel build using gcc trunk, narrowed down to > when -frename-registers was enabled at -O2. It is just luck however > that we aren't seeing this on older toolchains. > > Thanks to Segher for working with me to find this issue. > > Signed-off-by: Anton Blanchard <an...@samba.org> > Cc: <sta...@vger.kernel.org> > Fixes: d0cebfa650a0 ("powerpc: word-at-a-time optimization for 64-bit Little > Endian")
Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/b4c112114aab9aff5ed4568ca5 cheers _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev