RKSimon added a comment. In D143287#4150186 <https://reviews.llvm.org/D143287#4150186>, @ManuelJBrito wrote:
> There are some performance regressions with casts from 128 to 512. The > backend inserts vinsertf instructions. So that has to be fixed. > In D130339 <https://reviews.llvm.org/D130339> @RKSimon mentioned something > about custom vector widening patterns that need to be adjusted to handle > freeze(undef), any pointers for how a patch for that would look like? IIRC there are various places in X86ISelLowering where we try to match vector widening/concat patterns - such as collectConcatOps/getTargetShuffleAndZeroables/resolveTargetShuffleInputsAndMask (and many more) - it should be fine to address these on a case by case basis though, as many should just disappear via SimplifyDemandedVectorElts etc. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D143287/new/ https://reviews.llvm.org/D143287 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
