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Here's a function that takes a Double which is always passed to a foreign import expecting a Double#. Since the value is always unpacked, I'd expect add3 to be strict in the Double argument and thereby avoid some allocation.

add3
  :: Distribution
     -> Double
     -> Int64
     -> State# RealWorld
     -> (# State# RealWorld, () #)
add3 =
  \ (distrib_a1uw :: Distribution)
    (val_a1ux :: Double)
    (n_a1uy :: Int64)
    (eta_X22 :: State# RealWorld) ->
    case myThreadId# eta_X22 of _ { (# ipv_i229, ipv1_i22a #) ->
    case threadStatus# ipv1_i22a ipv_i229
    of _ { (# ipv2_i22e, _, ipv4_i22g, _ #) ->
    case modInt# ipv4_i22g 8 of ww1_i1NM { __DEFAULT ->
    case distrib_a1uw
         `cast` (<NTCo:Distribution> :: Distribution ~# Array Stripe)
    of _ { Array ds2_i22q ->
    case indexArray# ds2_i22q ww1_i1NM of _ { (# ipv6_i1Nz #) ->
    case ipv6_i1Nz
    of _ { Stripe ipv7_s22v ipv8_s22w ipv9_s22x ipv10_s22y ->
    case {__pkg_ccall main hs_lock Addr#
                          -> State# RealWorld -> (# State# RealWorld #)}_i20J
           ipv9_s22x ipv2_i22e
    of _ { (# ds4_i20P #) ->
    case touch# ipv10_s22y ds4_i20P of s'_i20R { __DEFAULT ->
    case val_a1ux of _ { D# ds6_d1D8 ->
    case n_a1uy of _ { I64# ds8_d1Da ->
    case {__pkg_ccall main hs_distrib_add_n Addr#
                                   -> Double# -> Int# -> State# RealWorld -> (# State# RealWorld #)}_d1Dd
           ipv7_s22v ds6_d1D8 ds8_d1Da s'_i20R
    of _ { (# ds9_d1Db #) ->
    case {__pkg_ccall main hs_unlock Addr#
                            -> State# RealWorld -> (# State# RealWorld #)}_i20m
           ipv9_s22x ds9_d1Db
    of _ { (# ds10_i20s #) ->
    case touch# ipv10_s22y ds10_i20s of s'1_i20u { __DEFAULT ->
    case touch# ipv8_s22w s'1_i20u of s'2_i1YT { __DEFAULT ->
    (# s'2_i1YT, () #)
    }
    }
    }
    }
    }
    }
    }
    }
    }
    }
    }
    }
    }
    }

Trac metadata

Trac field	Value
Version	7.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Operating system
Architecture