[PATCH] D100812: [DAGCombiner] Allow operand of step_vector to be negative.

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck added a comment.

I also have nothing against the change in principle, but in addition to @paulwalker-arm's comments, RISC-V won't support this: it expects IMM to be 1, as it always was before this. We shouldn't introduce something that regresses this target, so the lowering of STEP_VECTOR will need to be extended to legalize/lower the operation.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D100812/new/

https://reviews.llvm.org/D100812