search for: test_arg_del

David, Peter, Let me try it one more time, now with an example… Short of upstreaming a fake function clone pass, let me only illustrate the issue in raw debug output. Hopefully it should be sufficient. Try this: clang -Os -g -fno-strict-aliasing test_arg_del.ll -mllvm -debug -mllvm -print-after-all After DAE - Removing argument 1 (reg) from foo DAE - Removing argument 2 (field) from foo DAE - Removing argument 4 (offset) from foo We are going to have something like this: *** IR Dump After Dead Argument Elimination ***; ModuleID = ...

I will start from afar… When a dead function argument is removed, should we keep around the debug info for it? I have the following case: define internal fastcc void @foo(i8* %aa, i8* %reg, i8* %field, i32 %bb, ...) unnamed_addr #3 !dbg !28 { entry: call void @llvm.dbg.value(metabb i8* %aa, i64 0, metabb !34, metabb !47), !dbg !57 call void @llvm.dbg.value(metabb i8* %reg, i64 0,