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Drew T
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- §48-A allocno-PRICING DIALS (global.c:594): sink an init into the if/else arms to collapse a live-range and RAISE priority byte-neutrally (cross_jump re-merges the tails after regalloc); the local-alloc $s0 occupant that pushes arg0 to $s1; block-scoped per-case temps as a local-alloc tie gate (local-alloc.c:1765 refuses to tie a multi-block pseudo). - §48-B THE EBB RULE, the general form of §46-L2: anything that must survive cse needs its def and uses in different extended basic blocks — reg-reg copies, held global addresses (la $sN in a loop preheader, def at loop top + use inside a jtbl-reached case), pointers-to-global across calls. Corollary: a pointer-to-global survives only if EVERY use is at offset 0 (fold_rtx folds sym+k). - §48-C the C TYPE selects the addressing mode: scalar global -> lui/%lo, struct global -> la+offset; lwl/lwr block copy == a plain assign of a 2-byte-aligned struct (mips.c:output_block_move needs align>=4 for the lw/sw arm); the dead-sibling-scalar trap (cost 108 ins — use a real array). - §48-D the CROSS-JUMP RATCHET: two cases needing opposite branch senses cannot be a mirrored if/else — cross_jump + jump.c's invert-over-uncond-jump collapse them into one. Use gotos into labels inside the other case. - 9/12 first-pass MATCH by ordinary agents applying the map. Fable5 discovers a class; everyone else applies it.