Tracking Issue for `XOP` target feature

[sayantn]

The feature gate for this issue is #[feature(xop_target_feature)].

This tracks the integration of AMD's XOP instruction set into Rust.

Steps

• Adding the xop target feature to Rustc and its runtime detection in stdarch
• Final Comment Period (FCP)
• Stabilization PR

Public API

The xop target-feature and its runtime detection

Implementation History

• Added the xop target-feature and the xop_target_feature feature gate #127209
• Runtime detection of xop target-feature stdarch#1604

[VorpalBlade]

What is the point in supporting this? Apparently it was only ever supported on Buldozer (and other derived follows up like Piledriver etc), and was removed on Zen and later. So it seems largely like a historic curiosity of little use to anyone, with similar relevance as 3DNow.

[sayantn]

That is true. I just saw that it was a major x86 target feature left unimplemented, so decided to start a pr. Also, a small addition like this shouldn't hurt.