[all-commits] [llvm/llvm-project] 0b55f7: [RISCV] Fix interleave crash on unary interleaves

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0b55f7c5c69ff2a2776a03f32ad31bedc556faf3
      https://github.com/llvm/llvm-project/commit/0b55f7c5c69ff2a2776a03f32ad31bedc556faf3
  Author: Luke Lau <luke at igalia.com>
  Date:   2023-04-25 (Tue, 25 Apr 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-interleave.ll

  Log Message:
  -----------
  [RISCV] Fix interleave crash on unary interleaves

We were crashing when lowering interleave shuffles like
(shuffle <0,3,1,4>, x:v4i8, y:v4i8)
Where it was technically an unary shuffle (both EvenSrc and OddSrc point
to the first operand), but the resulting extract_subvectors were out of
bounds.
This checks to make sure that the vectors being extracted are within
range.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D148647