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Hi Sam, I am not a MIPS expert by any means, so YMMV, but: MIPS addu only differs to "add" in its (non)setting of the overflow flag. Because LLVM doesn't provide a way via the IR to access the overflow flag, a special notation isn't required in the IR to distinguish the two operations. Do you have another example? Cheers, James -----Original Message----- From:

Thanks for the replies guys but I think I should have phrased my question better... looking at the Mips backend there are machine instructions that operate on signed and unsigned data, such as add and addu. And like Mips, I need to specify unsigned specific instructions, so how do these get chosen between if the LLVM IR does not carry type data? A very general point in the right direction is all i