[all-commits] [llvm/llvm-project] a31063: [RISCV] Disable SLP vectorization by default due t...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a310637132e16ecb081528496b81ddfdcf3c6d7c
      https://github.com/llvm/llvm-project/commit/a310637132e16ecb081528496b81ddfdcf3c6d7c
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2022-08-26 (Fri, 26 Aug 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
    M llvm/test/Transforms/SLPVectorizer/RISCV/load-store.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/rvv-min-vector-size.ll

  Log Message:
  -----------
  [RISCV] Disable SLP vectorization by default due to unresolved profitability issues

This change implements a TTI query with the goal of disabling slp vectorization on RISCV. The current default configuration disables SLP already, but its current tied to the ability to lower fixed length vectors. Over in D131508, I want to enable fixed length vectors for purposes of LoopVectorizer, but preliminary analysis has revealed a couple of SLP specific issues we need to resolve before enabling it by default. This change exists to allow us to enable LV without SLP.

Differential Revision: https://reviews.llvm.org/D132680