Gated 1-in-16 sampled opcode histogram in the recompiler (tallied in run_block,
printed sorted with cumulative % at clean exit). Drives which opcodes the JIT
lowers first. Boot+movie result: workload is FP-heavy — addi 15%, lwz 12%,
rlwinm 10%, lfs 9%, stfs 7.5%, lfsx 5%, fmaddsx 4.6%, bc 3.7%, fmulsx 3.6%,
stw 3.4% ... top-20 = 90%, ~33% floating-point. This is why we go straight to a
Cranelift machine-code JIT (which attacks the FP op bodies) rather than a
closure-threaded stage (which only removes dispatch).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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