6 ms·
A common misconception about RISC processors.
by mmaunder 6y ago
A common misconception about RISC processors.
- chrisseaton 6y agoIt’s not a RISC thing - CISC implementations do exactly the same kind of fusion for similar pairs of operations.
- userbinator 6y agoIt has a bit less gain on a RISC due to the code density (or lack thereof), since it requires more fetch bandwidth. Apple works around this by using a very wide front-end: https://news.ycombinator.com/item?id=25257932 https://news.ycombinator.com/item?id=25257932
- _chris_ 6y agox86-64 code density is more than 4 bytes / instruction.
- saagarjha 6y agoThat looks like inverse density.
- chrisseaton 6y agoIsn’t that the point?