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classvtbltype
2010 Oct 11
4
[LLVMdev] Missed devirtualization opportunities
I took the output of clang, simplified it, and used it as a testbase.
Essentially, there is one class with one virtual function; I create an
instance and call the virtual method all in one function:
; The TestVirtual class vtbl
@classvtbl.TestVirtual = constant %classvtbltype.TestVirtual {
; Pointers to the virtual methods for the TestVirtual class
...
}
; ...
define i32 @main() nounwind {
; create the instance
%pinstance = alloca %class.TestVirtual
; %ppVtbl becomes a pointer to the instance's vtbl pointer.
%ppVtbl = getelementptr %class.TestVirtual* %pinsta...