[PATCH] D102330: [CodeGen][AArch64][SVE] Fold [rdffr, ptest] => rdffrs for RDFFR_P

[Paul Walker via Phabricator via llvm-commits]

paulwalker-arm added inline comments.


================
Comment at: llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:1372
+    case AArch64::RDFFR_P: {
+      // rdffr   p1.b <--- Optimize this to rdffrs p1.b, p0/z
+      // <between instructions no defs of Mask nor use/def of Flags>
----------------
This is only equivalent when `p0` is all true or when the result of the `rdffr` is not used (i.e. dead).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D102330/new/

https://reviews.llvm.org/D102330