[all-commits] [llvm/llvm-project] a61907: [OpenMP] Manually unroll the argument copy loop

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a619072c6189a2eac82e30d5ebb5946cb1297281
      https://github.com/llvm/llvm-project/commit/a619072c6189a2eac82e30d5ebb5946cb1297281
  Author: Joseph Huber <jhuber6 at vols.utk.edu>
  Date:   2022-03-21 (Mon, 21 Mar 2022)

  Changed paths:
    M openmp/libomptarget/DeviceRTL/src/Parallelism.cpp

  Log Message:
  -----------
  [OpenMP] Manually unroll the argument copy loop

The unroll pragma did not properly work as the loop bound was not known
when we optimize the runtime and we then added a "unroll disable"
metadata which prevented unrolling later when the bounds were known.
For now we manually unroll to make sure up to 16 elements are handled
nicely. This helps optimizations to look through the argument passing.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D109164