[PATCH] D128006: [RISCV] Avoid changing etype for splat of 0 or -1

[Philip Reames via Phabricator via llvm-commits]

reames added inline comments.


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Comment at: llvm/test/CodeGen/RISCV/rvv/fixed-vectors-extload-truncstore.ll:10
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    vsetivli zero, 2, e8, mf8, ta, mu
 ; CHECK-NEXT:    vlm.v v0, (a0)
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craig.topper wrote:
> Seems like this could be e16, mf4 to avoid the later vsetvli
We don't have any demanded rules for vlm.v, and as such, can't rewrite the vsetvli before it.

I went and glanced at the spec for that instruction, and honestly, the wording is vague enough I'm not quite sure what we're allowed to do with it.  


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128006/new/

https://reviews.llvm.org/D128006