[all-commits] [llvm/llvm-project] e4b284: [SelectionDAG] Handle VSCALE in isKnownNeverZero (...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e4b28420f677207cbb81683396d1aba00fb9ab80
      https://github.com/llvm/llvm-project/commit/e4b28420f677207cbb81683396d1aba00fb9ab80
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-07-05 (Fri, 05 Jul 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    A llvm/test/CodeGen/RISCV/rvv/known-never-zero.ll

  Log Message:
  -----------
  [SelectionDAG] Handle VSCALE in isKnownNeverZero (#97789)

VSCALE is by definition greater than zero, but this checks it via
getVScaleRange anyway.

The motivation for this is to be able to check if the EVL for a VP
strided load is non-zero in #97394.

I added the tests to the RISC-V backend since the existing X86
known-never-zero.ll test crashed when trying to lower vscale for the
+sse2 RUN line.



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