http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53949
Bug #: 53949 Summary: [SH] Add support for mac.w / mac.l instructions Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target AssignedTo: unassig...@gcc.gnu.org ReportedBy: olege...@gcc.gnu.org CC: ch...@gcc.gnu.org Target: sh*-*-* So far, GCC does not utilize the integer multiply-add instructions. On SH1 only the mac.w instruction is supported. On SH2 and above the mac.w and mac.l instructions are available. Carry over from PR 39423 comment #20 > On a related thread, for further work, I'm thinking on adding support for the > MAC instruction, now that was have the multiply and add. But this requires > exposing the MACLH registers to reload. Had anyone had a thought on this ? I'd > like to give this a try pretty soon.