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...xit is not post-dominated by free(). The transform could still fire by noticing that the pointer returned by malloc never escaped the function. (A more expensive check would be to see that it never escaped the function along the path that didn't call free. This is related to http://llvm.org/PR8908#c1 .) One other thing we may want is a flag for "does not care about the pointer itself, only what the pointer points to". Currently, nothing tells LLVM that puts() doesn't check whether the pointer argument == &string_00000001, so we can't actually remove the copy. We cou...

Hello, I'm developing a programming language that is optimized for strings. A first hello world program shows me that llvm needs a lot more work on zero terminated strings. In the following example, I have an auto generated hello world example optimized with -O3. The problem is, that the constant string is copied into a malloced mem area, then puts is called and then the memory is freed.