On Sun, Jan 22, 2023 at 10:42 PM Joel Jacobson <j...@compiler.org> wrote:
> I did write the code like you suggest first, but changed it, > since I realised the extra "else if" needed could be eliminated, > and thought div_var_int64() wouldn't be slower than div_var_int() since > I thought 64-bit instructions in general are as fast as 32-bit instructions, > on 64-bit platforms. According to Agner's instruction tables [1], integer division on Skylake (for example) has a latency of 26 cycles for 32-bit operands, and 42-95 cycles for 64-bit. [1] https://www.agner.org/optimize/instruction_tables.pdf -- John Naylor EDB: http://www.enterprisedb.com
