String mapi ~2.5x perf improvement #9474
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EDIT: closing in favor of #9481 and #9482.
See for details on this improvement: #9390 (comment).
TLDR: using a
char []on the fixed expected output improves ~2.1x, then 2x unrolling brings this to ~2.5x. In other words, if it took 1 second before, it now takes 0.4 seconds.