[llvm-bugs] [Bug 46634] New: Filecheck {{$}} doesn't delimit DAG range as expected

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46634

            Bug ID: 46634
           Summary: Filecheck {{$}} doesn't delimit DAG range as expected
           Product: Test Suite
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: lit
          Assignee: unassignedbugs at nondot.org
          Reporter: paul_robinson at playstation.sony.com
                CC: daniel at zuster.org, llvm-bugs at lists.llvm.org

Re http://lists.llvm.org/pipermail/llvm-dev/2020-July/143168.html
trying to match the two metadata tags in this line, in either order:

  %r1 = add %r2, %r3 !some-metadata !1, !some-other-metadata !2

I had thought that using this would work:

  CHECK: %r1 = add %r2, %r3
  CHECK-DAG: !some-metadata
  CHECK-DAG: !some-other-metadata
  CHECK: {{$}}

That is, I expected the {{$}} to constrain the DAG range to the
same line that matched the "add" instruction.  But it doesn't.
The above checks will happily match this:

  %r1 = add %r2, %r3 !some-metadata
  foobar
  !some-other-metadata

and `--dump-input=always -v` shows the {{$}} matching after the
second DAG, regardless of how many lines away that is.

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