[LLVMbugs] [Bug 605] NEW: [cbackend] C Type layout doesn't match LLVM type layout on Darwin in all cases

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=605

           Summary: [cbackend] C Type layout doesn't match LLVM type layout
                    on Darwin in all cases
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: C
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Because of the funny Darwin structure layout rules, the following testcase is miscompiled by the C 
backend:

----
%T = type { double, int }
implementation
%T* %foo(%T* %P) {
        %P2 = getelementptr %T* %P, int 1
        ret %T* %P2
}
----

It should compile to:

_foo:
        addi r3, r3, 12
        blr

But the CBE compiles it to:

_foo:
        addi r3,r3,16
        blr

-Chris



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