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cranelift-codegen: port bnot lowering to ISLE in x64

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This commit is contained in:
Nick Fitzgerald
2021-12-08 16:54:02 -08:00
committed by Andrew Brown
parent b5e5366550
commit da73952021
5 changed files with 254 additions and 181 deletions
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21
cranelift/codegen/src/isa/x64/lower.isle
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@@ -1007,6 +1007,27 @@
;;;; Rules for `bnot` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; `i64` and smaller.
(rule (lower (has_type (fits_in_64 ty) (bnot x)))
(value_reg (not ty (put_in_reg x))))
;; `i128`.
(decl i128_not (Value) ValueRegs)
(rule (i128_not x)
(let ((x_regs ValueRegs (put_in_regs x))
(x_lo Reg (value_regs_get x_regs 0))
(x_hi Reg (value_regs_get x_regs 1)))
(value_regs (not $I64 x_lo)
(not $I64 x_hi))))
(rule (lower (has_type $I128 (bnot x)))
(i128_not x))
(rule (lower (has_type $B128 (bnot x)))
(i128_not x))
;; Special case for vector-types where bit-negation is an xor against an
;; all-one value
(rule (lower (has_type ty @ (multi_lane _bits _lanes) (bnot x)))