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Cranelift: aarch64: lower umin.i64 and friends (#5495)

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* Cranelift: aarch64: lower umin.i64 and friends

* fuzzgen: Enable integer-min/max for aarch64
This commit is contained in:
Mrmaxmeier
2022-12-30 03:03:31 +01:00
committed by GitHub
parent ff995d910b
commit fe992c2627
3 changed files with 51 additions and 22 deletions
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30
cranelift/codegen/src/isa/aarch64/lower.isle
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@@ -887,6 +887,36 @@
;;; Rules for integer min/max: umin, smin, umax, smax ;;;;;;;;;;;;;;;;;;;;;;;;;
;; `i64` and smaller.
;; cmp $x, $y
;; csel .., $x, $y, $cc
(decl cmp_and_choose (Type Cond bool Value Value) ValueRegs)
(rule (cmp_and_choose (fits_in_64 ty) cc _ x y)
(let ((x Reg (put_in_reg x))
(y Reg (put_in_reg y)))
(with_flags_reg (cmp (operand_size ty) x y)
(csel cc x y))))
;; `i16` and `i8` min/max require sign extension as
;; the comparison operates on (at least) 32 bits.
(rule 1 (cmp_and_choose (fits_in_16 ty) cc signed x y)
(let ((x Reg (extend (put_in_reg x) signed (ty_bits ty) 32))
(y Reg (extend (put_in_reg y) signed (ty_bits ty) 32)))
(with_flags_reg (cmp (operand_size ty) x y)
(csel cc x y))))
(rule 2 (lower (has_type (and (fits_in_64 ty) (ty_int _)) (umin x y)))
(cmp_and_choose ty (Cond.Lo) $false x y))
(rule 2 (lower (has_type (and (fits_in_64 ty) (ty_int _)) (smin x y)))
(cmp_and_choose ty (Cond.Lt) $true x y))
(rule 2 (lower (has_type (and (fits_in_64 ty) (ty_int _)) (umax x y)))
(cmp_and_choose ty (Cond.Hi) $false x y))
(rule 2 (lower (has_type (and (fits_in_64 ty) (ty_int _)) (smax x y)))
(cmp_and_choose ty (Cond.Gt) $true x y))
;; Vector types.
(rule (lower (has_type ty @ (not_i64x2) (smin x y)))
(vec_rrr (VecALUOp.Smin) x y (vector_size ty)))