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get away with it, which exposes opportunities to eliminate the memory objects entirely. For example, we now compile byval.ll to: define internal void @f1(i32 %b.0, i64 %b.1) { entry: %tmp2 = add i32 %b.0, 1 ; <i32> [#uses=0] ret void } define i32 @main() nounwind { entry: call void @f1( i32 1, i64 2 ) ret i32 0 } This seems like it would trigger a lot for code that passes around small structs (e.g. SDOperand's or _Complex)... llvm-svn: 45886