On Tue, 2014-09-09 at 19:28 -0400, David Edelsohn wrote:
> On Tue, Sep 9, 2014 at 3:29 PM, Segher Boessenkool
> > 2014-09-09 Segher Boessenkool <seg...@kernel.crashing.org>
> >
> > * config/rs6000/htm.md (tabort, tabortdc, tabortdci, tabortwc,
> > tabortwci, tbegin, tcheck, tend, trechkpt, treclaim, tsr): Use xor
> > instead of minus.
> > * config/rs6000/vector.md (cr6_test_for_zero_reverse,
> > cr6_test_for_lt_reverse): Ditto.
>
> This is okay with me, but let me give Peter a chance to comment if
> there was a specific reason to use subfic instead of xori. This may
> have been a carry-over from Z, which does not have the same CA clobber
> issue.
Actually, I just copied the usage in cr6_test_for_zero_reverse and
cr6_test_for_lt_reverse, so I'm not against using xori...as long as
compiling a "if __builtin_tbegin (0) {...}" still ends up with a
.tbegin followed immediately by a branch (ie, no interleaving copy
from CR and compare instruction).
Peter
