RISC-V and Floating Point

RISC-V and Floating Point(fprox.substack.com)

6 points by hasheddan 4 hours ago | 2 comments

Netch 4 hours ago |

From a bystanderʼs POV it is excessively hard to memorize all the mess with multiple different extensions. The naming style doesnʼt alleviate the task. But this is a typical issue in the whole RISC-V ecosystem.

What Iʼm slightly confused for is that all these extensions, useful for a minor part of applications, arenʼt moved to longer instructions (6-byte).

camel-cdr 1 hour ago | |

> From a bystanderʼs POV it is excessively hard to memorize all the mess with multiple different extensions

It's the same for other ISAs.

> What Iʼm slightly confused for is that all these extensions, useful for a minor part of applications, arenʼt moved to longer instructions (6-byte).

Because these instructions don't need it. There will be future >4-byte instructions, for things thay can't resonably be done in 4-bytes, e.g. much larger immediates.