[llvm-bugs] [Bug 38666] New: Replace pass by const reference with pass by value

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38666

            Bug ID: 38666
           Summary: Replace pass by const reference with pass by value
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

Example:

int f(const int &p) {
    return p;
}
=>
int f_optimized(const int p) {
    return p;
}

Idea: clone function to modify parameters(if external linkage; modify directly
if static one), modify callsites -> replace const references with copies if
sizeof(T) <= sizeof(T *).


Maybe a new opt pass or part of a current one (which one?) ?

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