[llvm-bugs] [Bug 43091] New: lldb very slow single stepping rep stosb

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43091

            Bug ID: 43091
           Summary: lldb very slow single stepping rep stosb
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: ntysdd at qq.com
                CC: jdevlieghere at apple.com, llvm-bugs at lists.llvm.org

When single stepping the asm instructions, I find lldb very slow when
encountering a (large) rep stosb.

The debugger essentially hung.

While I can use Ctrl-C to break the program into debugger, I still can't
continue debugging, because even I put a breakpoint on the next instruction,
and use the "c" command, it is still very slow.

However, if I don't try to single step the rep instruction, and directly put a
breakpoint on the next instruction and use "c", it's way faster.

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