Of course the ISA matters in the extrem but once some commen patterns are covered the changes are only lead to tiny further improvments. RISC-V failure to incl

Of course the ISA matters in the extrem but once some commen patterns are covered the changes are only lead to tiny further improvments. RISC-V failure to include these feature was very diliberate because only feature that everybody needs are in the base ISA. The feature you ask for will be in the 'B' extention that will be standardised soon and will probebly become part of many standard profiles.