[PATCH] D144481: [Assignment Tracking] Only set module flag if pass modifies a function

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

Orlando created this revision.
Orlando added reviewers: scott.linder, jmorse, StephenTozer.
Orlando added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a project: All.
Orlando requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

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.


https://reviews.llvm.org/D144481

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

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