[all-commits] [llvm/llvm-project] 6aaf1e: [LoopIdiom] Fix store size SCEV type.

[Clement Courbet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6aaf1e7ea931a1865cc97ebf8fcb084772f8142e
      https://github.com/llvm/llvm-project/commit/6aaf1e7ea931a1865cc97ebf8fcb084772f8142e
  Author: Clement Courbet <courbet at google.com>
  Date:   2021-10-11 (Mon, 11 Oct 2021)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp
    A llvm/test/Transforms/LoopIdiom/memset-pr52104.ll

  Log Message:
  -----------
  [LoopIdiom] Fix store size SCEV type.

We were using the type of the loop back edge count to represent the
store size. This failed for small loop counts (e.g. in the added test,
the loop count was an i2).

Use the index type instead.

Fixes PR52104.

Differential Revision: https://reviews.llvm.org/D111401