[llvm-bugs] [Bug 43294] New: missed opt: coalesce multiple consecutive ud2 instructions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43294

            Bug ID: 43294
           Summary: missed opt: coalesce multiple consecutive ud2
                    instructions
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: gonzalobg88 at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

When generating LLVM-IR, one often ends up with

call @llvm.trap()
unreachable

If the frontend has set the TargetMachine option to "trap on unreachable", the
call to trap will emit an ud2, while the unreachable would emit another ud2,
often end up with multiple consecutive ud2 instructions.

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