On Mon, Aug 21, 2017 at 7:20 AM, Marc Glisse <marc.glisse@xxxxxxxx> wrote: > On Mon, 21 Aug 2017, Jeffrey Walton wrote: > >> I'm trying to use _addcarryx_u64. GCC 7.1 is still generating ADD and >> ADC instead of ADCX or ADOX: > > Does that compute wrong values? Make the program slower? It looks like the values are computed correctly. I don't know the affect on performance. The only benchmarks I have are for add/adc. I can't get the adcx/adox generated to benchmark them. Compared to Intel ICC code generation, Intel's code is about 20% to 30% smaller. Jeff
