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Remove the widening_pairwise_dot_product_s clif instruction (#5889)

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This was added for the wasm SIMD proposal but I've been poking around at
this recently and the instruction can instead be represented by its
component parts with the same semantics I believe. This commit removes
the instruction and instead represents it with the existing
`iadd_pairwise` instruction (among others) and updates backends to with
new pattern matches to have the same codegen as before.

This interestingly entirely removed the codegen rule with no replacement
on the AArch64 backend as the existing rules all existed to produce the
same codegen.
This commit is contained in:
Alex Crichton
2023-02-27 12:43:43 -06:00
committed by GitHub
parent 6cf7155052
commit 9b86a0b9b1
8 changed files with 46 additions and 88 deletions
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17
cranelift/codegen/src/isa/s390x/lower.isle
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@@ -138,6 +138,14 @@
(vec_add ty x (vec_lshr_by_byte x size))
(vec_add ty y (vec_lshr_by_byte y size)))))
;; special case for the `i32x4.dot_i16x8_s` wasm instruction
(rule 1 (lower
(has_type dst_ty (iadd_pairwise
(imul (swiden_low x @ (value_type src_ty)) (swiden_low y))
(imul (swiden_high x) (swiden_high y)))))
(vec_add dst_ty (vec_smul_even src_ty x y)
(vec_smul_odd src_ty x y)))
;;;; Rules for `isub` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -484,15 +492,6 @@
(mov_to_vec128 $I64X2 res_0 res_1)))
;;;; Rules for `widening_pairwise_dot_product_s` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Widening pairwise dot product of two vector registers.
(rule (lower (has_type dst_ty (widening_pairwise_dot_product_s
x @ (value_type src_ty) y)))
(vec_add dst_ty (vec_smul_even src_ty x y)
(vec_smul_odd src_ty x y)))
;;;; Rules for `sqmul_round_sat` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Fixed-point multiplication of two vector registers.