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On Tue, Jan 27, 2009 at 2:54 PM, David Greene <dag at cray.com> wrote: > How do I go about creating the copy t = x? I don't want to use an add with a > zero constant because it may not be optimized in all circustations (floating > point, for example). You can use a no-op bitcast for scalars, but there isn't any reliable way to do it for all first-class values. That said,

There is no register-to-register copy instructions in LLVM. I've found a bug in mem2reg (LLVM 2.3 but it doesn't appear to be fixed in trunk either) and a copy instruction seems to be the easiest way to fix it. Consider this code coming into the RenamePass phase of mem2reg. "*" in the phi means we haven't added that incoming value yet. // x.0 = ... //