diff --git a/Manifest.toml b/Manifest.toml
index a6a0199d..33d94b16 100644
--- a/Manifest.toml
+++ b/Manifest.toml
@@ -34,9 +34,9 @@ version = "1.4.1"
 
 [[LLVMExtra_jll]]
 deps = ["Artifacts", "JLLWrappers", "LazyArtifacts", "Libdl", "TOML"]
-git-tree-sha1 = "e46e3a40daddcbe851f86db0ec4a4a3d4badf800"
+git-tree-sha1 = "070e4b5b65827f82c16ae0916376cb47377aa1b5"
 uuid = "dad2f222-ce93-54a1-a47d-0025e8a3acab"
-version = "0.0.19+0"
+version = "0.0.18+0"
 
 [[LazyArtifacts]]
 deps = ["Artifacts", "Pkg"]
diff --git a/Project.toml b/Project.toml
index 83340148..566fd274 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "LLVM"
 uuid = "929cbde3-209d-540e-8aea-75f648917ca0"
-version = "4.17.0"
+version = "4.17.1"
 
 [deps]
 CEnum = "fa961155-64e5-5f13-b03f-caf6b980ea82"
@@ -11,5 +11,5 @@ Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
 CEnum = "0.2, 0.3, 0.4"
-LLVMExtra_jll = "=0.0.19"
+LLVMExtra_jll = "=0.0.18"
 julia = "1.6"
diff --git a/deps/LLVMExtra/include/LLVMExtra.h b/deps/LLVMExtra/include/LLVMExtra.h
index 3a2fd60d..a74e700f 100644
--- a/deps/LLVMExtra/include/LLVMExtra.h
+++ b/deps/LLVMExtra/include/LLVMExtra.h
@@ -162,8 +162,5 @@ void LLVMReplaceMDNodeOperandWith(LLVMMetadataRef MD, unsigned I, LLVMMetadataRe
 LLVMBool LLVMContextSupportsTypedPointers(LLVMContextRef C);
 #endif
 
-// constant data
-LLVMValueRef LLVMConstDataArray(LLVMTypeRef ElementTy, const void *Data, unsigned NumElements);
-
 LLVM_C_EXTERN_C_END
 #endif
diff --git a/deps/LLVMExtra/lib/llvm-api.cpp b/deps/LLVMExtra/lib/llvm-api.cpp
index 6aeed0ae..cfea2a95 100644
--- a/deps/LLVMExtra/lib/llvm-api.cpp
+++ b/deps/LLVMExtra/lib/llvm-api.cpp
@@ -556,8 +556,3 @@ LLVMBool LLVMContextSupportsTypedPointers(LLVMContextRef C) {
   return unwrap(C)->supportsTypedPointers();
 }
 #endif
-
-LLVMValueRef LLVMConstDataArray(LLVMTypeRef ElementTy, const void *Data, unsigned NumElements) {
-    StringRef S((const char *)Data, NumElements * unwrap(ElementTy)->getPrimitiveSizeInBits() / 8);
-    return wrap(ConstantDataArray::getRaw(S, NumElements, unwrap(ElementTy)));
-}
diff --git a/lib/libLLVM_extra.jl b/lib/libLLVM_extra.jl
index 1329dbbb..5acb9a48 100644
--- a/lib/libLLVM_extra.jl
+++ b/lib/libLLVM_extra.jl
@@ -416,7 +416,3 @@ function LLVMContextSupportsTypedPointers(Ctx)
     ccall((:LLVMContextSupportsTypedPointers, libLLVMExtra), LLVMBool, (LLVMContextRef,), Ctx)
 end
 end
-
-function LLVMConstDataArray(ElementTy, Data, NumElements)
-    ccall((:LLVMConstDataArray, libLLVMExtra), LLVMValueRef, (LLVMTypeRef, Ptr{Cvoid}, Cuint), ElementTy, Data, NumElements)
-end
diff --git a/src/core/module.jl b/src/core/module.jl
index f4f764fa..950389a4 100644
--- a/src/core/module.jl
+++ b/src/core/module.jl
@@ -267,30 +267,3 @@ function Base.setindex!(iter::ModuleFlagDict, val::Metadata,
                         (name, behavior)::Tuple{String, API.LLVMModuleFlagBehavior})
     API.LLVMAddModuleFlag(iter.mod, behavior, name, length(name), val)
 end
-
-
-## sdk version
-
-export sdk_version, sdk_version!
-
-function sdk_version!(mod::Module, version::VersionNumber)
-    entries = Int32[version.major]
-    if version.minor != 0 || version.patch != 0
-        push!(entries, version.minor)
-        if version.patch != 0
-            push!(entries, version.patch)
-        end
-        # cannot represent prerelease or build metadata
-    end
-    md = Metadata(ConstantDataArray(entries; ctx=context(mod)))
-
-    flags(mod)["SDK Version", LLVM.API.LLVMModuleFlagBehaviorWarning] = md
-end
-
-function sdk_version(mod::Module)
-    haskey(flags(mod), "SDK Version") || return nothing
-    md = flags(mod)["SDK Version"]
-    c = Value(md; ctx=context(mod))
-    entries = collect(c)
-    VersionNumber(map(val->convert(Int, val), entries)...)
-end
diff --git a/src/core/type.jl b/src/core/type.jl
index 78f92208..828d8329 100644
--- a/src/core/type.jl
+++ b/src/core/type.jl
@@ -163,7 +163,7 @@ function ArrayType(eltyp::LLVMType, count)
     return ArrayType(API.LLVMArrayType(eltyp, count))
 end
 
-Base.length(arrtyp::ArrayType) = Int(API.LLVMGetArrayLength(arrtyp))
+Base.length(arrtyp::ArrayType) = API.LLVMGetArrayLength(arrtyp)
 
 Base.isempty(@nospecialize(T::ArrayType)) = length(T) == 0 || isempty(eltype(T))
 
diff --git a/src/core/value/constant.jl b/src/core/value/constant.jl
index 589811a2..615cc6fb 100644
--- a/src/core/value/constant.jl
+++ b/src/core/value/constant.jl
@@ -112,67 +112,17 @@ Base.convert(::Type{T}, val::ConstantFP) where {T<:AbstractFloat} =
     convert(T, API.LLVMConstRealGetDouble(val, Ref{API.LLVMBool}()))
 
 
-# sequential data
+# sequential
 
 export ConstantDataSequential, ConstantDataArray, ConstantDataVector
 
 abstract type ConstantDataSequential <: Constant end
 
-# ConstantData can only contain primitive types (1/2/4/8 byte integers, float/half),
-# as opposed to ConstantAggregate which can contain arbitrary LLVM values.
-#
-# however, LLVM seems to use both array types interchangeably, e.g., constructing
-# a ConstArray through LLVMConstArray may return a ConstantDataArray (presumably as an
-# optimization, when the data can be represented as densely packed primitive values).
-# because of that, ConstantDataArray and ConstantArray need to behave the same way,
-# concretely, indexing a ConstantDataArray has to return LLVM constant values...
-#
-# XXX: maybe we should just not expose ConstantDataArray then?
-#      one advantage of keeping them separate is that creating a ConstantDataArray
-#      is much cheaper (we should also be able to iterate much more efficiently,
-#      but cannot support that as explained above).
-
-# array interface
-Base.eltype(cda::ConstantDataSequential) = llvmeltype(cda)
-Base.length(cda::ConstantDataSequential) = length(llvmtype(cda))
-Base.size(cda::ConstantDataSequential) = (length(cda),)
-function Base.getindex(cda::ConstantDataSequential, idx::Integer)
-    @boundscheck 1 <= idx <= length(cda) || throw(BoundsError(cda, idx))
-    Value(API.LLVMGetElementAsConstant(cda, idx-1))
-end
-function Base.collect(cda::ConstantDataSequential)
-    constants = Array{Value}(undef, length(cda))
-    for i in 1:length(cda)
-        @inbounds constants[i] = cda[i]
-    end
-    return constants
-end
-
 @checked struct ConstantDataArray <: ConstantDataSequential
     ref::API.LLVMValueRef
 end
 register(ConstantDataArray, API.LLVMConstantDataArrayValueKind)
 
-function ConstantDataArray(typ::LLVMType, data::Array{T}) where {T <: Union{Integer, AbstractFloat}}
-    # TODO: can we look up the primitive size of the LLVM type?
-    #       use that to assert it matches the Julia element type.
-    return ConstantDataArray(API.LLVMConstDataArray(typ, data, length(data)))
-end
-
-# shorthands with arrays of plain Julia data
-# FIXME: duplicates the ConstantInt/ConstantFP conversion rules
-# XXX: X[X(...)] instead of X.(...) because of empty-container inference
-ConstantDataArray(data::AbstractVector{T}; ctx::Context) where {T<:Integer} =
-    ConstantDataArray(IntType(sizeof(T)*8; ctx), data)
-ConstantDataArray(data::AbstractVector{Core.Bool}; ctx::Context) =
-    ConstantDataArray(Int1Type(ctx), data)
-ConstantDataArray(data::AbstractVector{Float16}; ctx::Context) =
-    ConstantDataArray(HalfType(ctx), data)
-ConstantDataArray(data::AbstractVector{Float32}; ctx::Context) =
-    ConstantDataArray(FloatType(ctx), data)
-ConstantDataArray(data::AbstractVector{Float64}; ctx::Context) =
-    ConstantDataArray(DoubleType(ctx), data)
-
 @checked struct ConstantDataVector <: ConstantDataSequential
     ref::API.LLVMValueRef
 end
@@ -212,14 +162,16 @@ export ConstantArray
     ref::API.LLVMValueRef
 end
 register(ConstantArray, API.LLVMConstantArrayValueKind)
+register(ConstantArray, API.LLVMConstantDataArrayValueKind)
+
+ConstantArrayOrAggregateZero(value) = Value(value)::Union{ConstantArray,ConstantAggregateZero}
 
 # generic constructor taking an array of constants
 function ConstantArray(typ::LLVMType, data::AbstractArray{T,N}=T[]) where {T<:Constant,N}
     @assert all(x->x==typ, llvmtype.(data))
 
     if N == 1
-        # XXX: this can return a ConstDataArray (presumably as an optimization?)
-        return Value(API.LLVMConstArray(typ, Array(data), length(data)))
+        return ConstantArrayOrAggregateZero(API.LLVMConstArray(typ, Array(data), length(data)))
     end
 
     ca_vec = map(x->ConstantArray(typ, x), eachslice(data, dims=1))
@@ -231,15 +183,15 @@ end
 # shorthands with arrays of plain Julia data
 # FIXME: duplicates the ConstantInt/ConstantFP conversion rules
 # XXX: X[X(...)] instead of X.(...) because of empty-container inference
-ConstantArray(data::AbstractArray{T}; ctx::Context) where {T<:Integer} =
+ConstantArray(data::AbstractArray{T,N}; ctx::Context) where {T<:Integer,N} =
     ConstantArray(IntType(sizeof(T)*8; ctx), ConstantInt[ConstantInt(x; ctx) for x in data])
-ConstantArray(data::AbstractArray{Core.Bool}; ctx::Context) =
+ConstantArray(data::AbstractArray{Core.Bool,N}; ctx::Context) where {N} =
     ConstantArray(Int1Type(ctx), ConstantInt[ConstantInt(x; ctx) for x in data])
-ConstantArray(data::AbstractArray{Float16}; ctx::Context) =
+ConstantArray(data::AbstractArray{Float16,N}; ctx::Context) where {N} =
     ConstantArray(HalfType(ctx), ConstantFP[ConstantFP(x; ctx) for x in data])
-ConstantArray(data::AbstractArray{Float32}; ctx::Context) =
+ConstantArray(data::AbstractArray{Float32,N}; ctx::Context) where {N} =
     ConstantArray(FloatType(ctx), ConstantFP[ConstantFP(x; ctx) for x in data])
-ConstantArray(data::AbstractArray{Float64}; ctx::Context) =
+ConstantArray(data::AbstractArray{Float64,N}; ctx::Context) where {N} =
     ConstantArray(DoubleType(ctx), ConstantFP[ConstantFP(x; ctx) for x in data])
 
 # convert back to known array types
@@ -274,9 +226,7 @@ function Base.getindex(ca::ConstantArray, idx::Integer...)
     I = CartesianIndices(size(ca))[idx...]
     for i in Tuple(I)
         if isempty(operands(ca))
-            # XXX: is this valid? LLVMGetElementAsConstant is meant to be used with
-            #      Constant*Data*Arrays, not ConstantArrays
-            ca = Value(API.LLVMGetElementAsConstant(ca, i-1))
+            ca = LLVM.Value(API.LLVMGetElementAsConstant(ca, i-1))
         else
             ca = (Base.@_propagate_inbounds_meta; operands(ca)[i])
         end
diff --git a/test/core.jl b/test/core.jl
index eb07a663..f6a32e50 100644
--- a/test/core.jl
+++ b/test/core.jl
@@ -419,23 +419,29 @@ end
     end
 
 
-    @testset "array aggregate constants" begin
+    @testset "array constants" begin
 
     # from Julia values
     let
-        vec = Int128[1,2,3,4]
+        vec = Int32[1,2,3,4]
         ca = ConstantArray(vec; ctx)
-        @test ca isa ConstantArray
         @test size(vec) == size(ca)
         @test length(vec) == length(ca)
         @test ca[1] == ConstantInt(vec[1]; ctx)
         @test collect(ca) == ConstantInt.(vec; ctx)
     end
+    let
+        vec = Float32[1.1f0,2.2f0,3.3f0,4.4f0]
+        ca = ConstantArray(vec; ctx)
+        @test size(vec) == size(ca)
+        @test length(vec) == length(ca)
+        @test ca[1] == ConstantFP(vec[1]; ctx)
+        @test collect(ca) == ConstantFP.(vec; ctx)
+    end
     let
         # tests for ConstantAggregateZero, constructed indirectly.
         # should behave similarly to ConstantArray since it can get returned there.
         ca = ConstantArray(Int[]; ctx)
-        @test ca isa ConstantAggregateZero
         @test size(ca) == (0,)
         @test length(ca) == 0
         @test isempty(collect(ca))
@@ -452,7 +458,7 @@ end
 
     end
 
-    @testset "struct aggregate constants" begin
+    @testset "struct constants" begin
 
     # from Julia values
     let
@@ -507,36 +513,6 @@ end
     end
 
     end
-
-
-    @testset "array data constants" begin
-
-    let
-        vec = Int32[1,2,3,4]
-        eltyp = LLVM.Int32Type(ctx)
-        cda = ConstantDataArray(eltyp, vec)
-        @test cda isa ConstantDataArray
-        @test llvmtype(cda) == LLVM.ArrayType(eltyp, 4)
-        @test collect(cda) == ConstantInt.(vec; ctx)
-    end
-
-    # from Julia values
-    for T in [Int8, Int16, Int32, Int64]
-        vec = T[1,2,3,4]
-        cda = ConstantDataArray(vec; ctx)
-        @test cda isa ConstantDataArray
-        @test size(vec) == size(cda)
-        @test collect(cda) == ConstantInt.(vec; ctx)
-    end
-    for T in [Float32, Float64]
-        vec = T[1,2,3,4]
-        cda = ConstantDataArray(vec; ctx)
-        @test cda isa ConstantDataArray
-        @test size(vec) == size(cda)
-        @test collect(cda) == ConstantFP.(vec; ctx)
-    end
-
-    end
 end
 
 # constant expressions
@@ -1015,10 +991,6 @@ end
 
     @test mod_flags["foobar"] == md
     @test_throws KeyError mod_flags["foobaz"]
-
-    @test sdk_version(mod) === nothing
-    sdk_version!(mod, v"1.2.3")
-    @test sdk_version(mod) == v"1.2.3"
 end
 
 # metadata iteration