_tool_c89cc_emit_d $(( (_v 16) & 255 ))
Cw) STATE=C88; ast_Cy; continue;;
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PS. This tagged pointer technique is actually a universal pattern across systems programming. It solves two problems: First, in dynamically typed contexts, the execution engine must know a value's type before operating on it. Second, placing this metadata in an extra struct field wastes memory and causes cache-misses from pointer chasing. To survive memory bus bottlenecks, engineers cram metadata directly into the unused bits of pointers. We'll discuss in the next post.