[Git][ghc/ghc][wip/js-staging] JS.Primops: Doc explaining lack of vector support

[doyougnu (@doyougnu)]

doyougnu pushed to branch wip/js-staging at Glasgow Haskell Compiler / GHC


Commits:
f5c4cbab by doyougnu at 2022-09-13T09:18:30-04:00
JS.Primops: Doc explaining lack of vector support

- - - - -


1 changed file:

- compiler/GHC/StgToJS/Prim.hs


Changes:

=====================================
compiler/GHC/StgToJS/Prim.hs
=====================================
@@ -1182,6 +1182,12 @@ genPrim prof ty op = case op of
   ListThreadsOp                     -> unhandledPrimop op
   LabelThreadOp                     -> unhandledPrimop op -- \[] [t,la,lo] -> PrimInline $ t .^ "label" |= ValExpr (JList [la, lo])
 
+------------------------------- Vector -----------------------------------------
+-- For now, vectors are unsupported on the JS backend. Simply put, they do not
+-- make much sense to support given support for arrays and lack of SIMD support
+-- in JS. We could try to roll something special but we would not be able to
+-- give any performance guarentees to the user and so we leave these has
+-- unhandled for now.
   VecBroadcastOp _ _ _              -> unhandledPrimop op
   VecPackOp _ _ _                   -> unhandledPrimop op
   VecUnpackOp _ _ _                 -> unhandledPrimop op



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f5c4cbabc3f398f4b4be7e1740e4909913da44c9

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f5c4cbabc3f398f4b4be7e1740e4909913da44c9
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