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Vector bitcast support (AArch64 & Interpreter) (#4820)

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* Vector bitcast support (AArch64 & Interpreter)

Implemented support for `bitcast` on vector values for AArch64 and the
interpreter.

Also corrected the verifier to ensure that the size, in bits, of the input and
output types match for a `bitcast`, per the docs.

Copyright (c) 2022 Arm Limited

* `I128` same-type bitcast support

Copyright (c) 2022 Arm Limited

* Directly return input for 64-bit GPR<=>GPR bitcast

Copyright (c) 2022 Arm Limited
This commit is contained in:
Damian Heaton
2022-09-21 17:20:28 +01:00
committed by GitHub
parent 05cbd667c7
commit e786bda002
15 changed files with 478 additions and 26 deletions
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25
cranelift/codegen/src/isa/aarch64/lower.isle
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@@ -2209,17 +2209,26 @@
;;; Rules for `bitcast` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower (has_type $I32 (bitcast src @ (value_type $F32))))
(mov_from_vec src 0 (ScalarSize.Size32)))
; SIMD&FP <=> SIMD&FP
(rule (lower (has_type (ty_float_or_vec out_ty) (bitcast x @ (value_type (ty_float_or_vec _)))))
(fpu_move out_ty x))
(rule (lower (has_type $F32 (bitcast src @ (value_type $I32))))
(mov_to_fpu src (ScalarSize.Size32)))
; GPR => SIMD&FP
(rule (lower (has_type (ty_float_or_vec _) (bitcast x @ (value_type in_ty))))
(if (ty_int_bool_ref_scalar_64 in_ty))
(mov_to_fpu x (scalar_size in_ty)))
(rule (lower (has_type $I64 (bitcast src @ (value_type $F64))))
(mov_from_vec src 0 (ScalarSize.Size64)))
; SIMD&FP => GPR
(rule (lower (has_type out_ty (bitcast x @ (value_type (fits_in_64 (ty_float_or_vec _))))))
(if (ty_int_bool_ref_scalar_64 out_ty))
(mov_from_vec x 0 (scalar_size out_ty)))
(rule (lower (has_type $F64 (bitcast src @ (value_type $I64))))
(mov_to_fpu src (ScalarSize.Size64)))
; GPR <=> GPR
(rule (lower (has_type out_ty (bitcast x @ (value_type in_ty))))
(if (ty_int_bool_ref_scalar_64 out_ty))
(if (ty_int_bool_ref_scalar_64 in_ty))
x)
(rule (lower (has_type $I128 (bitcast x @ (value_type $I128)))) x)
;;; Rules for `raw_bitcast` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;