On 2/06/2023 14:50, Jeffrey Walton wrote: > The advertised use case for dual addc instructions is big integer > operations. I read that somewhere in the Intel docs several years ago. I know ;) That's why I added you to CC: https://gcc.gnu.org/legacy-ml/gcc-help/2017-08/msg00085.html https://stackoverflow.com/questions/29747508/what-is-the-difference-between-the-adc-and-adcx-instructions-on-ia32-ia64 > When I benchmarked ADCX/ADOX several years ago, ADCX/ADOX were slower > than using a single ADDC. So I stayed with ADDC. Maybe CPU > manufacturers have improved things nowadays. That's what I'm working on right now. Thanks for sharing. Regards
