2 ms·
Citation needed? I've never encountered that, and used plenty of those. The main reason old instruction become slow is that the hardware implementation is repl
by yvdriess 6y ago
Citation needed? I've never encountered that, and used plenty of those.
The main reason old instruction become slow is that the hardware implementation is replaced by a microcoded version.
- dogma1138 6y agoMMX these days costs extra instructions on both AMD and Intel CPUs. This has been the case since SSE and SSE2 were introduced and later AVX extensions. There quite possibly been a point in time where certain MMX instructions run faster on some AMD CPUs and required less uOps to achieve. https://agner.org/optimize/ https://agner.org/optimize/ This is a pretty good source for uOps and instruction cycles.