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ISLE: remove all uses of argument polarity, and remove it from the language. (#4091)

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This PR removes "argument polarity": the feature of ISLE extractors that lets them take
inputs aside from the value to be matched.

Cases that need this expressivity have been subsumed by #4072 with if-let clauses;
we can now finally remove this misfeature of the language, which has caused significant
confusion and has always felt like a bit of a hack.

This PR (i) removes the feature from the ISLE compiler; (ii) removes it from the reference
documentation; and (iii) refactors away all uses of the feature in our three existing
backends written in ISLE.
This commit is contained in:
Chris Fallin
2022-05-02 09:52:12 -07:00
committed by GitHub
parent c7e2c21bb2
commit 03793b71a7
21 changed files with 2123 additions and 2464 deletions
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cranelift/codegen/src/isa/aarch64/lower/isle/generated_code.manifest
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@@ -1,4 +1,4 @@
src/clif.isle 443b34b797fc8ace
src/prelude.isle a7915a6b88310eb5
src/isa/aarch64/inst.isle a2c0ae729bfa24a8
src/isa/aarch64/lower.isle 15641ca7f0ac061a
src/isa/aarch64/inst.isle 21a43af20be377d2
src/isa/aarch64/lower.isle 75ad8450963e3829

965
cranelift/codegen/src/isa/aarch64/lower/isle/generated_code.rs generated
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