This extension does not appear to be on its way to ratification.
Out of the unratified bitmanip extensions, this one had the
largest impact on the compiler.
Posting this patch to start a discussion about whether we should
remove these extensions. We'll talk more at the RISC-V sync meeting this
Thursday.
Reviewed By: asb, reames
Differential Revision: https://reviews.llvm.org/D133834
This implements experimental support for the Zawrs extension as specified here: https://github.com/riscv/riscv-zawrs/releases/download/V1.0-rc3/Zawrs.pdf. Despite the 1.0 version name, this has not been ratified and there was a major change to proposed specification between rc2 and rc3. Once this is ratified, it'll move out of experimental status.
This change adds assembly support, but does not include C language or IR intrinsics. We can decide if we want them, and handle that in a separate patch.
Differential Revision: https://reviews.llvm.org/D133443
This is based on a somewhat subjective review of the in-tree support, and where I thought further work was needed before I'd consider these "done". See the review for some discussion around what is left in terms of pattern matching.
Differential Revision: https://reviews.llvm.org/D133373
Sorry, there's no real theme to this. It's simply the rest of the extensions we implement which don't need individual discussion.
Differential Revision: https://reviews.llvm.org/D133529
This adds a description of the currently existing experimental extensions. I took all information about versions and specifications from either the original commits, or current code. I'm not terribly familiar with any of these, so double checking my facts is much appreciated.
Differential Revision: https://reviews.llvm.org/D133214
Unless I missed something when checking, we only support these in assembly. Given that, documenting them is a good opportunity to define support levels which will be useful for other extensions as well.
Differential Revision: https://reviews.llvm.org/D133372
This follows the pattern set by e.g. SPIR-V, AMDGPU, and WebAssembly.
For the moment, this page is fairly minimal stub. I mostly want a place to record which extensions we support, and when that support is not complete, a central place to note that. I'm deliberately starting with a subset of extensions which are pretty straight forward with only one case needing a detail note.
I figure the partial support cases are going to need a bunch of discussion, and having each of them in their own review seemed worthwhile. Similarly, the experimental extensions probably fall into the same bucket of triggering a bunch of review discussion.
Differential Revision: https://reviews.llvm.org/D133063
Craig Topper