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2018 May 01
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IPRA and conditionally reserved registers
Hi Kit, I see you have been working on IPRA (https://reviews.llvm.org/D45308), and would therefore like to bring up an issue with it I am looking into on SystemZ (see https://reviews.llvm.org/D46232). I first realized that %r14, the return register, must be saved and restored with IPRA enabled, since otherwise the function can't return. This is a callee saved register so without IPRA this always gets saved, but if that is omitted and the function has no calls itself, we have to have a...