batched_mul broken on Julia nightly

[mcabbott]

This works fine on Julia 1.10, but fails on 1.11:

julia> using NNlib

julia> batched_mul(rand(Float32, 2,2,2), rand(Float32, 2,2,2))
ERROR: conversion to pointer not defined for Array{Float32, 3}
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] unsafe_convert(::Type{Ptr{Float32}}, a::Array{Float32, 3})
    @ Base ./pointer.jl:67
  [3] batched_gemm!
    @ ~/.julia/packages/NNlib/MS1Kl/src/gemm.jl:83 [inlined]
  [4] _batched_gemm!(::Type{…}, transA::Char, transB::Char, α::Float32, A::Array{…}, B::Array{…}, β::Float32, C::Array{…})
    @ NNlib ~/.julia/packages/NNlib/MS1Kl/src/batched/batchedmul.jl:262
  [5] _batched_try_gemm!(::Type{…}, C::Array{…}, A::Array{…}, B::Array{…}, α::Float32, β::Float32)
...
 [10] batched_mul(A::Array{Float32, 3}, B::Array{Float32, 3})
    @ NNlib ~/.julia/packages/NNlib/MS1Kl/src/batched/batchedmul.jl:59
 [11] top-level scope
    @ REPL[95]:1
Some type information was truncated. Use `show(err)` to see complete types.

julia> VERSION
v"1.11.0-DEV.1344"

julia> Base.unsafe_convert(::Type{Ptr{Float32}}, a::Array{Float32, 3}) = pointer(a)  # quick hack

julia> batched_mul(rand(Float32, 2,2,2), rand(Float32, 2,2,2))
2×2×2 Array{Float32, 3}:
[:, :, 1] =
 0.242345  0.519529
 0.169381  0.388915

[:, :, 2] =
 0.646874  0.312372
 0.688869  0.320908

[ToucheSir]

Same story for the gemm! routines used in conv_im2col! and more. Is there a more stable way for us to interact with BLAS for these sorts of operations?

[mcabbott]

I think it's some change in Base about how you are supposed to get a pointer. Or maybe what everyone was doing was never the official way.

Edit: I think JuliaLang/julia#51962 is the issue about this.