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Hi, I have worked with GCC prior to using LLVM, and I am a bit startled to find no way to use an earlier operand as is done in GCC. For example, a sext instruction on my target takes one the operand of a low-part register, and then sign extends into the full register.I find that there is no way to use for example (set RC:$srsc, sext($src, 16)), or in any other way use a sext operator to perform