[llvm-bugs] [Bug 52029] New: Aarch64-Darwin Large Code Model is not implemented correctly. Memory allocator crash

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52029

            Bug ID: 52029
           Summary: Aarch64-Darwin Large Code Model is not implemented
                    correctly. Memory allocator crash
           Product: new-bugs
           Version: 12.0
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: anand.jain at juliacomputing.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

In https://github.com/JuliaLang/julia/issues/41440#issuecomment-932016347 and
https://github.com/JuliaLang/julia/issues/42295 we've noticed a recurring issue
related to the large code model for the new Apple Silicon chips. 

The issue is that the Orc JIT will crash if the memory allocator does not
allocate sections within 4GB of each other (which the default allocator does
not). 

Possible relevant lines of code:
https://github.com/llvm/llvm-project/blob/6f7483b1ece4747f2aafe4baa05fc07e7dc9ed9d/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp#L7687-L7689

keno at alumni.harvard.edu said I should cc lhames at gmail.com and
t.p.northover at gmail.com. 

(not sure if this is the correct way to tag people using bugzilla)

thanks

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