1 //===- DeadArgumentElimination.cpp - Eliminate dead arguments -------------===//
9 // This pass deletes dead arguments from internal functions.  Dead argument
10 // elimination removes arguments which are directly dead, as well as arguments
11 // only passed into function calls as dead arguments of other functions.  This
12 // pass also deletes dead return values in a similar way.
15 // interprocedural passes, which add possibly-dead arguments or return values.
64 /// The dead argument elimination pass.
98 INITIALIZE_PASS(DAE, "deadargelim", "Dead Argument Elimination", false, false)
102 /// The DeadArgumentHacking pass, same as dead argument elimination, but deletes
117                 "Dead Argument Hacking (BUGPOINT USE ONLY; DO NOT USE)", false,
127 /// called, the varargs list is dead for the function.
236   // at it, remove the dead arguments from the DeadArguments list.  in deleteDeadVarargs()
267   // semantics. In the below example, the dead load from %p may not have been  in removeDeadArgumentsFromCallers()
476   // Assume it's dead (which will only hold if there are no uses at all..).  in surveyUses()
512   // Assume all return values are dead  in surveyFunction()
754   // Construct the new parameter list from non-dead arguments. Also construct  in removeDeadStuffFromFunction()
783   // If there is a function with a live 'returned' argument but a dead return  in removeDeadStuffFromFunction()
963         // If the return value is dead, replace any uses of it with poison  in removeDeadStuffFromFunction()
1028       // If this argument is dead, replace any uses of it with poison  in removeDeadStuffFromFunction()
1093   // Now that the old function is dead, delete it.  in removeDeadStuffFromFunction()
1127   LLVM_DEBUG(dbgs() << "DeadArgumentEliminationPass - Deleting dead varargs\n");  in run()
1133   // live. We assume all arguments are dead unless proven otherwise (allowing us  in run()
1134   // to determine that dead arguments passed into recursive functions are dead).  in run()
1141   // Now, remove all dead arguments and return values from each function in  in run()