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cranelift/egraphs: more select/bitselect optimizations
I've been thinking about the algebraic relationships between bmask
and other instructions due to recent PRs, and wrote down a few of them here.
These patterns don't seem to appear in any of the Sightglass bz2
, pulldown-cmark
, and spidermonkey
benchmarks, as this PR has no effect on execution-time instructions retired for those benchmarks.
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