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2016 Apr 18
2
Redundant Twine->StringRef->Twine conversions in llvm::sys::fs::make_absolute?
llvm::sys::fs::make_absolute converts its first parameter (const Twine
¤t_directory) to StringRef p(path.data(), path.size()), and then
passes that StringRef to several functions (path::has_root_directory,
path::has_root_name, and path::append) that accept Twines as parameters.
Since llvm::StringRef can implicitly convert to an llvm::Twine, p converts
to a bunch of Twine temporaries.
In a few places, namely path::has_root_directory & path::has_root_name,
that temporary Twine is again converted to a StringRef:
boo...