[llvm-bugs] [Bug 50142] New: `__builtin_setjmp` saves frame pointer incorrectly for x86_64-w64-windows-gnu (MinGW) target

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50142

            Bug ID: 50142
           Summary: `__builtin_setjmp` saves frame pointer incorrectly for
                    x86_64-w64-windows-gnu (MinGW) target
           Product: new-bugs
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: xtkoba at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24805
  --> https://bugs.llvm.org/attachment.cgi?id=24805&action=edit
Repro

The attached file contains a reproducing code and its objdump.

When cross-compiled for x86_64-w64-windows-gnu (MinGW) on my x86_64 GNU/Linux
environment, `__builtin_setjmp` saves the frame pointer which is 0x80 lower
than expected, and so the local variables are messed up after returning with
`__builtin_longjmp`.

A workaround is to add 0x80 to the first element of the jump buffer immediately
after `__builtin_setjmp` returns 0.

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