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Add (bnot (bxor x y)) lowerings for s390x/aarch64 (#5763)

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* Add (bnot (bxor x y)) lowerings for s390x/aarch64

I originally thought that s390x's original lowering in #5709, but as was
rightfully pointed out `(bnot (bxor x y))` is equivalent to
`(bxor x (bnot y))` so the special lowering for one should apply as a
special lowering for the other. For the s390x and aarch64 backend that
have already have a fused lowering of the bxor/bnot add a lowering
additionally for the bnot/bxor combination.

* Add bnot(bxor(..)) tests for s390x 128-bit sizes
This commit is contained in:
Alex Crichton
2023-02-13 09:41:18 -06:00
committed by GitHub
parent d99783fc91
commit a0a97f5e8f
5 changed files with 85 additions and 0 deletions
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5
cranelift/codegen/src/isa/aarch64/lower.isle
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@@ -1052,6 +1052,11 @@
(rule -2 (lower (has_type (ty_vec128 ty) (bnot x)))
(not x (vector_size ty)))
;; Special-cases for fusing a bnot with bxor
(rule 2 (lower (has_type (fits_in_64 ty) (bnot (bxor x y))))
(alu_rs_imm_logic (ALUOp.EorNot) ty x y))
(rule 3 (lower (has_type $I128 (bnot (bxor x y)))) (i128_alu_bitop (ALUOp.EorNot) $I64 x y))
;;;; Rules for `band` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule -1 (lower (has_type (fits_in_64 ty) (band x y)))