On Mon, 28 Mar 2011 22:59:31 -0700, Tom Stellard <tstel...@gmail.com> wrote: > This pass scans programs for instructions that read registers that have > not been written and replaces these reads with a read from a constant > register with the value of zero. This pass prevents phantom > dependencies from being introduced by the register allocator and > improves the efficiency of subsequent optimization passes.
I'm not sure why optimizing a program with undefined behavior (using undefined register values) is interesting. It just seems like an opportunity to make a mistake and break programs that should have defined behavior.
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