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aarch64: Migrate some bit-ops to ISLE (#3602)

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* aarch64: Migrate some bit-ops to ISLE

This commit migrates these instructions to ISLE:

* `bnot`
* `band`
* `bor`
* `bxor`
* `band_not`
* `bor_not`
* `bxor_not`

The translations were relatively straightforward but the interesting
part here was trying to reduce the duplication between all these
instructions. I opted for a route that's similar to what the lowering
does today, having a `decl` which takes the `ALUOp` and then performs
further pattern matching internally. This enabled each instruction's
lowering to be pretty simple while we still get to handle all the fancy
cases of shifts, constants, etc, for each instruction.

* Actually delete previous lowerings

* Remove dead code
This commit is contained in:
Alex Crichton
2021-12-15 10:41:36 -06:00
committed by GitHub
parent 2cdbf32a06
commit 4236319a53
8 changed files with 1204 additions and 223 deletions
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cranelift/codegen/src/isa/aarch64/lower/isle/generated_code.manifest
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