[llvm-bugs] [Bug 48804] New: [NPM] Pass GlobalMerge does not honour print-before/after-all

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48804

            Bug ID: 48804
           Summary: [NPM] Pass GlobalMerge does not honour
                    print-before/after-all
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: sjoerd.meijer at arm.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Compiling this:

  void foo(int x, int y) {
    static int a = 0;
    static int b = 0;
    a += x;
    b += y;
  }

with e.g.:

  clang -Ofast --target=aarch64 -S -mllvm -print-after-all -mllvm
-aarch64-enable-global-merge -fexperimental-new-pass-manager


won't show something similar as:

  *** IR Dump After GlobalMerge ***

and it doesn't dump the IR. Adding -mllvm -debug to compile command will only
show:

   Trying to merge set, starts with #0

which is the only LLVM_DEBUG message in that pass, just showing that the pass
runs.

This is actually not a problem of the NPM, also the legacy PM shows this
behaviour.
Thus, I don't think this needs to be a blocker, but it would be nice to fix it
and so I have added it as blocker just for visibility.

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