Replace Tausworthe+LCG RNG with stateless Philox4x32-10

Project.toml

@@ -1,6 +1,6 @@
 name = "GPUArrays"
 uuid = "0c68f7d7-f131-5f86-a1c3-88cf8149b2d7"
-version = "11.4.1"
+version = "11.5.0"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

lib/JLArrays/src/JLArrays.jl

@@ -539,18 +539,6 @@ end
 
 using Random
 
-const GLOBAL_RNG = Ref{Union{Nothing,GPUArrays.RNG}}(nothing)
-function GPUArrays.default_rng(::Type{<:JLArray})
-    if GLOBAL_RNG[] === nothing
-        N = MAXTHREADS
-        state = JLArray{NTuple{4, UInt32}}(undef, N)
-        rng = GPUArrays.RNG(state)
-        Random.seed!(rng)
-        GLOBAL_RNG[] = rng
-    end
-    GLOBAL_RNG[]
-end
-
 
 ## GPUArrays interfaces
 

src/GPUArrays.jl

@@ -38,5 +38,6 @@ include("host/statistics.jl")
 include("host/sparse.jl")
 include("host/alloc_cache.jl")
 
+include("deprecated.jl")
 
 end # module

src/deprecated.jl

@@ -0,0 +1,18 @@
+# RNG: the old RNG took a GPU state array and Vector{UInt32} seeds.
+# The new stateless Philox4x32 RNG doesn't need either.
+
+function RNG(state::AbstractGPUArray)
+    AT = Base.typename(typeof(state)).wrapper
+    Base.depwarn("RNG(state::AbstractGPUArray) is deprecated, use RNG{$AT}() instead", :RNG)
+    RNG{AT}()
+end
+
+function Random.seed!(rng::RNG, seed::Vector{UInt32})
+    Base.depwarn("seed!(rng::RNG, seed::Vector{UInt32}) is deprecated, use seed!(rng, seed::Integer) instead", :seed!)
+    Random.seed!(rng, isempty(seed) ? rand(Random.RandomDevice(), UInt64) : first(seed))
+end
+
+# Stub kept so downstream packages that still extend `GPUArrays.default_rng`
+# (Metal.jl, etc.) continue to load. The interface itself is gone — `RNG{AT}()`
+# is now constructed directly — so any extension of this is dead code.
+function default_rng end