https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62631
--- Comment #15 from amker at gcc dot gnu.org --- (In reply to amker from comment #14) > (In reply to Eric Botcazou from comment #12) > > I'm about to install a patch that changes the costs on SPARC 64-bit to: > > > > Use 1: > > cand cost compl. depends on > > 0 4 0 inv_expr:0 > > 1 8 0 > > 4 6 0 inv_expr:1 > > 5 0 0 > > 6 0 0 > > > > but this doesn't change the outcome of the test. :-( > > I will have a look why it fails with refined cost. > > Thanks, > bin The cost of expression "p + ((sizetype)(99 - i_6(D)) + 1) * 4" computed using normal +/-/* operators on sparc64 is 18, but the cost is 32 if it is computed as "p + ((sizetype)(99 - i_6(D)) + 1) << 2", which is returned by get_shiftadd_cost. >From the assembly code, it seems the computation is expensive on sparc64, I may skip the test for these architectures if no other solutions. Thanks.
