Migrate clz, ctz, popcnt, bitrev, is_null, is_invalid on x64 to ISLE. #3848
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abrown
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Feb 25, 2022
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One more thought: it might be worthwhile to check that all of the instructions ported here are covered by runtests. |
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Updated, thanks!
Yep, I've verified that all of the bitops here are exercised by runtests; they actually caught a few bugs during porting. |
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@abrown you probably want to take another look at the changes related to |
fitzgen
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This was referenced Feb 26, 2022
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Along the way this introduces a few new utility bits to the ISLE bindings, e.g. some constructors to do integer arithmetic on constants (I'm surprised we got this far without it!). The bit-twiddling algorithms are, at least to my eye, a bit more legible in this form, but I'm happy to add more comments here if desired since we're making a pass over everything anyway.
Also updated a few stray places I had missed earlier where we can use implicit conversions (the
def_instremovals).