On Wed, 10 Feb 2016, Bernd Schmidt wrote: > On 02/10/2016 02:35 PM, Richard Biener wrote: > > > Index: gcc/ifcvt.c > > =================================================================== > > --- gcc/ifcvt.c (revision 233262) > > +++ gcc/ifcvt.c (working copy) > > @@ -1274,7 +1274,8 @@ noce_try_store_flag_constants (struct no > > && CONST_INT_P (XEXP (a, 1)) > > && CONST_INT_P (XEXP (b, 1)) > > && rtx_equal_p (XEXP (a, 0), XEXP (b, 0)) > > - && noce_operand_ok (XEXP (a, 0)) > > + && (REG_P (XEXP (a, 0)) > > + || ! reg_mentioned_p (if_info->x, XEXP (a, 0))) > > I guess that would also work. Could maybe use a brief comment.
Ok. I'm testing that. I wonder if we need to use reg_overlap_mentioned_p here (hard-reg pairs?) or if reg_mentioned_p is safe. I'm not too much into RTL ... Thanks, Richard.
