bytecodealliance
x64: Add support for `fmsub` and `fnmsub` instructions
👋 Hey,
Feature
Add support for the fmsub and fnmsub instructions in the x64 backend.
Benefit
This improves instruction selection quality for a few special fma cases.
Implementation
We already have support for the fmadd and fnmadd versions of these instructions here and here. So we adding support for these instructions should be a matter of introducing the new opcodes and implementing lowering rules similar to what already exists today.
Something similar was done in #8588 for the RISC-V backend. If anyone needs help implementing this, let me know!
Hey, I would like to try to implement this. I might need some help, as this is my first contribution.
If I have questions, should I ask them here or in Zulip?
Awesome! 🎉
If I have questions, should I ask them here or in Zulip?
Up to you, I'm available in both. I might be able to give you a faster reply on Zulip since that usually sends me a notification.
