Eli Friedman df649f3da5 Emit memmove, not memcpy, for structure copies; this is unfortunately ... required for correctness in cases of copying a struct to itself or to an overlapping struct (itself for cases like *a = *a, and overlapping is possible with unions). Hopefully, this won't end up being a perf issue; LLVM *should* be able to optimize memmove to memcpy in a lot of cases, and for small copies the generated code *should* be mostly comparable. (In reality, LLVM is currently horrible at optimizing memmove, but that's a bug, not a fundamental issue.) gcc currently generates wrong code; that's http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32667. llvm-svn: 51566		2008-05-26 12:59:39 +00:00
clang	Emit memmove, not memcpy, for structure copies; this is unfortunately	2008-05-26 12:59:39 +00:00
llvm	Use a DenseMap instead of an std::map, speeding up the testcase in PR2368 by about a third.	2008-05-26 10:07:43 +00:00