[llvm-bugs] [Bug 39045] New: TableGen -gen-global-isel ignores GISelPredicateCode when two PatFrag objects have the same frags value

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39045

            Bug ID: 39045
           Summary: TableGen -gen-global-isel ignores GISelPredicateCode
                    when two PatFrag objects have the same frags value
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: GlobalISel
          Assignee: unassignedbugs at nondot.org
          Reporter: tstellar at redhat.com
                CC: daniel_l_sanders at apple.com, llvm-bugs at lists.llvm.org,
                    rtereshin at apple.com

Created attachment 20909
  --> https://bugs.llvm.org/attachment.cgi?id=20909&action=edit
Failing test case

To reproduce:
llvm-tblgen -gen-global-isel gisel-predicate-code-ignored.td -I$INCLUDE_DIR

It looks like the issue is that the generated match table thinks that frag_a
and frag_b are the same, and so the predicates defined in GISelPredicateCode
are never checked.

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