[all-commits] [llvm/llvm-project] 3e48c8: [Assignment Tracking] Only set module flag if pass...

[Orlando Cazalet-Hyams via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3e48c8d75d1ca937ab3595909fb4198226c4ad1d
      https://github.com/llvm/llvm-project/commit/3e48c8d75d1ca937ab3595909fb4198226c4ad1d
  Author: OCHyams <orlando.hyams at sony.com>
  Date:   2023-02-22 (Wed, 22 Feb 2023)

  Changed paths:
    M llvm/include/llvm/IR/DebugInfo.h
    M llvm/lib/IR/DebugInfo.cpp
    A llvm/test/DebugInfo/Generic/assignment-tracking/declare-to-assign/set-flag-only-if-modified.ll

  Log Message:
  -----------
  [Assignment Tracking] Only set module flag if pass modifies a function

The module flag "debug-info-assignment-tracking" is set by the
declare-to-assign pass to indicate that assignment tracking is enabled. This
patch changes declare-to-assign to only set the flag if it makes a
modification. This lets the compiler avoid doing extra work for no benefit,
such as is currently the case if assignment tracking is requested for a build
with line tables only (-gmlt) or a build without debug info.

Reviewed By: scott.linder

Differential Revision: https://reviews.llvm.org/D144481