[all-commits] [llvm/llvm-project] 6107cd: [InstCombine] NEW Baseline tests for InstCombine o...

[William Junda Huang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6107cdc9295d339304ce3e88e0b038db661d2bcb
      https://github.com/llvm/llvm-project/commit/6107cdc9295d339304ce3e88e0b038db661d2bcb
  Author: William Huang <williamjhuang at google.com>
  Date:   2022-05-19 (Thu, 19 May 2022)

  Changed paths:
    A llvm/test/Transforms/InstCombine/gep-canonicalize-constant-indices.ll
    A llvm/test/Transforms/InstCombine/gep-merge-constant-indices.ll

  Log Message:
  -----------
  [InstCombine] NEW Baseline tests for InstCombine optimization to merge GEP instructions with constant indices

Splitted the merge constant-indexed GEP optimization into two smaller transformations: 1. Merging GEP of GEP if both are constant-indexed. 2. Swapping constant indexed GEP in a chain of (non-constant) GEP to the end, so that 1 can be applied repeatedly.
There is existing code to partially  handle transformation 1, but it only deals with limited cases

Unit tests are breaking down into two parts for the 2 transformations.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D125438