[all-commits] [llvm/llvm-project] 9d22b5: [RISCV] Use temporary stack in expanding SPLAT_VEC...

[Yunzezhu94 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9d22b54d6b214e174b786316ccc9308aa7dd7be3
      https://github.com/llvm/llvm-project/commit/9d22b54d6b214e174b786316ccc9308aa7dd7be3
  Author: Yunze Zhu <yunzezhu at linux.alibaba.com>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/test/CodeGen/RISCV/rvv/bitreverse-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/bitreverse-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/ctlz-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/ctlz-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/ctpop-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/ctpop-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/cttz-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/cttz-vp.ll
    A llvm/test/CodeGen/RISCV/rvv/splat-vector-split-i64-vl-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/stepvector.ll
    M llvm/test/CodeGen/RISCV/rvv/vadd-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vand-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vmul-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vor-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vsub-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vxor-sdnode.ll

  Log Message:
  -----------
  [RISCV] Use temporary stack in expanding SPLAT_VECTOR_SPLIT_I64_VL node

There is an issue: https://github.com/llvm/llvm-project/issues/63515
The issue is because when expanding SPLAT_VECTOR_SPLIT_I64_VL node, only memoperand is used to create dependency.
However in ScheduleDAGNodes, dependency is checked with chain only, and breaks order of store/load instructions.
I think in llvm.bitreverse.nxv2i64 intrinsic SPLAT_VECTOR_SPLIT_I64_VL nodes are parallel processed,
so no chain should be add to these nodes.
Using temporary in expanding SPLAT_VECTOR_SPLIT_I64_VL node can keep vlse instruction get correct value
no matter order of store instructions is changed.

Differential Revision: https://reviews.llvm.org/D153743