Hi! I'm going to move my code to 64 bits. And this is not a requirement but I just wonder if it's sane or possible or fun to personalize my own custom runtime to use mmap() to allocate memory in first 4GB address just for storing isa in 32 bits. I want to have 4 bytes for isa and 4 for retain counter. My concern is if I can have my personal module that allow altering clang's behavior in any way to make it only pass 4 bytes address when calling runtime apis. Thanks! Brrlu
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