[all-commits] [llvm/llvm-project] aea2a1: [LoopUnroll] Prevent LoopFullUnrollPass to perform...

[Yashwant Singh via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aea2a147363197f3cef140ebcd27b534fd41877b
      https://github.com/llvm/llvm-project/commit/aea2a147363197f3cef140ebcd27b534fd41877b
  Author: Yashwant Singh <Yashwant.Singh at amd.com>
  Date:   2023-04-13 (Thu, 13 Apr 2023)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
    A llvm/test/Transforms/LoopUnroll/full-unroll-avoid-partial.ll
    M llvm/test/Transforms/LoopUnroll/revisit.ll

  Log Message:
  -----------
  [LoopUnroll] Prevent LoopFullUnrollPass to perform partial/runtime unrolling

FullLoopUnroll was performing runtime unrolling in certain cases when
'#pragma unroll' was specified. Patch to fix this by introducing new parameter
to tryToUnrollLoop() to differentiate between LoopUnrollPass and
FullLoopUnrollPass. Based on the discussion here
(https://discourse.llvm.org/t/loop-unroller-fails-to-unroll-loop/69834)

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D148071