[PATCH] D76194: [BasicAA] Use known lower bounds for index values for size based check.

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

This change caused a 0.5% compile-time regression <http://llvm-compile-time-tracker.com/compare.php?from=e6aba43cda848f4a8cfa5ce9f174b77def10e9df&to=d99a1848c4f8ca164c0c0768e10eafc850b2a68a&stat=instructions>. The largest regression is 1.6% for lencod (with the q_matrix.c file at 3-4%). As the code-size changes are <= 0.01%, this optimization does not seem to trigger much in practice (and not at all for lencod). This seems like a somewhat unfavorable trade-off between compile-time and optimization power.


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  https://reviews.llvm.org/D76194/new/

https://reviews.llvm.org/D76194