On Tue, 4 Jun 2024, Jakub Jelinek wrote: > Hi! > > I think we can handle CTZ exactly like CLZ in tree_call_nonnegative_warnv_p. > Like CLZ, if it is UB at zero, the result range is [0, prec-1] and if it is > well defined at zero, the second argument provides the value at zero. > > Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK. Richard. > 2024-06-04 Jakub Jelinek <ja...@redhat.com> > > PR tree-optimization/115337 > * fold-const.cc (tree_call_nonnegative_warnv_p): Handle > CASE_CFN_CTZ like CASE_CFN_CLZ. > > --- gcc/fold-const.cc.jj 2024-06-04 12:08:14.671262211 +0200 > +++ gcc/fold-const.cc 2024-06-04 10:56:57.575425348 +0200 > @@ -15250,6 +15250,7 @@ tree_call_nonnegative_warnv_p (tree type > return true; > > CASE_CFN_CLZ: > + CASE_CFN_CTZ: > if (arg1) > return RECURSE (arg1); > return true; > > Jakub > > -- Richard Biener <rguent...@suse.de> SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg, Germany; GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)
