diff --git a/src/Diffractor.jl b/src/Diffractor.jl
index dae4e1e3..e4fef34b 100644
--- a/src/Diffractor.jl
+++ b/src/Diffractor.jl
@@ -1,11 +1,12 @@
 module Diffractor
 
+export ∂⃖, gradient
+
 using StructArrays
 using PrecompileTools
 
-export ∂⃖, gradient
-
 const CC = Core.Compiler
+using Core.IR
 
 @static if VERSION ≥ v"1.11.0-DEV.1498"
     import .CC: get_inference_world
@@ -33,7 +34,6 @@ end
     include("stage2/tfuncs.jl")
     include("stage2/forward.jl")
 
-    include("codegen/forward.jl")
     include("analysis/forward.jl")
     include("codegen/forward_demand.jl")
     include("codegen/reverse.jl")
diff --git a/src/codegen/forward.jl b/src/codegen/forward.jl
deleted file mode 100644
index 9a310379..00000000
--- a/src/codegen/forward.jl
+++ /dev/null
@@ -1,117 +0,0 @@
-function fwd_transform(ci, args...)
-    newci = copy(ci)
-    fwd_transform!(newci, args...)
-    return newci
-end
-
-function fwd_transform!(ci, mi, nargs, N)
-    new_code = Any[]
-    new_codelocs = Any[]
-    ssa_mapping = Int[]
-    loc_mapping = Int[]
-
-    emit!(@nospecialize stmt) = stmt
-    function emit!(stmt::Expr)
-        stmt.head ∈ (:call, :(=), :new, :isdefined) || return stmt
-        push!(new_code, stmt)
-        push!(new_codelocs, isempty(new_codelocs) ? 0 : new_codelocs[end])
-        return SSAValue(length(new_code))
-    end
-
-    function mapstmt!(@nospecialize stmt)
-        if isexpr(stmt, :(=))
-            return Expr(stmt.head, emit!(mapstmt!(stmt.args[1])), emit!(mapstmt!(stmt.args[2])))
-        elseif isexpr(stmt, :call)
-            args = map(stmt.args) do stmt
-                emit!(mapstmt!(stmt))
-            end
-            return Expr(:call, ∂☆{N}(), args...)
-        elseif isexpr(stmt, :new)
-            args = map(stmt.args) do stmt
-                emit!(mapstmt!(stmt))
-            end
-            return Expr(:call, ∂☆new{N}(), args...)
-        elseif isexpr(stmt, :splatnew)
-            args = map(stmt.args) do stmt
-                emit!(mapstmt!(stmt))
-            end
-            return Expr(:call, Core._apply_iterate, FwdIterate(DNEBundle{N}(iterate)), ∂☆new{N}(), emit!(Expr(:call, tuple, args[1])), args[2:end]...)
-        elseif isa(stmt, SSAValue)
-            return SSAValue(ssa_mapping[stmt.id])
-        elseif isa(stmt, Core.SlotNumber)
-            return SlotNumber(2 + stmt.id)
-        elseif isa(stmt, Argument)
-            return SlotNumber(2 + stmt.n)
-        elseif isa(stmt, NewvarNode)
-            return NewvarNode(SlotNumber(2 + stmt.slot.id))
-        elseif isa(stmt, ReturnNode)
-            return ReturnNode(emit!(mapstmt!(stmt.val)))
-        elseif isa(stmt, GotoNode)
-            return stmt
-        elseif isa(stmt, GotoIfNot)
-            return GotoIfNot(emit!(Expr(:call, primal, emit!(mapstmt!(stmt.cond)))), stmt.dest)
-        elseif isexpr(stmt, :static_parameter)
-            return ZeroBundle{N}(mi.sparam_vals[stmt.args[1]::Int])
-        elseif isexpr(stmt, :foreigncall)
-            return Expr(:call, error, "Attempted to AD a foreigncall. Missing rule?")
-        elseif isexpr(stmt, :meta) || isexpr(stmt, :inbounds)  || isexpr(stmt, :loopinfo) ||
-               isexpr(stmt, :code_coverage_effect)
-            # Can't trust that meta annotations are still valid in the AD'd
-            # version.
-            return nothing
-        elseif isexpr(stmt, :isdefined)
-            return Expr(:call, zero_bundle{N}(), emit!(stmt))
-        # Always disable `@inbounds`, as we don't actually know if the AD'd
-        # code is truly `@inbounds` or not.
-        elseif isexpr(stmt, :boundscheck)
-            return DNEBundle{N}(true)
-        else
-            # Fallback case, for literals.
-            # If it is an Expr, then it is not a literal
-            if isa(stmt, Expr)
-                error("Unexprected statement encountered. This is a bug in Diffractor. stmt=$stmt")
-            end
-            return Expr(:call, zero_bundle{N}(), stmt)
-        end
-    end
-
-    meth = mi.def::Method
-    for i = 1:meth.nargs
-        if meth.isva && i == meth.nargs
-            args = map(i:(nargs+1)) do j::Int
-                emit!(Expr(:call, getfield, SlotNumber(2), j))
-            end
-            emit!(Expr(:(=), SlotNumber(2 + i), Expr(:call, ∂vararg{N}(), args...)))
-        else
-            emit!(Expr(:(=), SlotNumber(2 + i), Expr(:call, getfield, SlotNumber(2), i)))
-        end
-    end
-
-    for (stmt, codeloc) in zip(ci.code, ci.codelocs)
-        push!(loc_mapping, length(new_code)+1)
-        push!(new_codelocs, codeloc)
-        push!(new_code, mapstmt!(stmt))
-        push!(ssa_mapping, length(new_code))
-    end
-
-    # Rewrite control flow
-    for (i, stmt) in enumerate(new_code)
-        if isa(stmt, GotoNode)
-            new_code[i] = GotoNode(loc_mapping[stmt.label])
-        elseif isa(stmt, GotoIfNot)
-            new_code[i] = GotoIfNot(stmt.cond, loc_mapping[stmt.dest])
-        end
-    end
-
-    ci.slotnames = Symbol[Symbol("#self#"), :args, ci.slotnames...]
-    ci.slotflags = UInt8[0x00, 0x00, ci.slotflags...]
-    ci.slottypes = ci.slottypes === nothing ? nothing : Any[Any, Any, ci.slottypes...]
-    ci.code = new_code
-    ci.codelocs = new_codelocs
-    ci.ssavaluetypes = length(new_code)
-    ci.ssaflags = UInt8[0 for i=1:length(new_code)]
-    ci.method_for_inference_limit_heuristics = meth
-    ci.edges = MethodInstance[mi]
-
-    return ci
-end
diff --git a/src/stage1/recurse_fwd.jl b/src/stage1/recurse_fwd.jl
index fa8a99fe..20c42f6c 100644
--- a/src/stage1/recurse_fwd.jl
+++ b/src/stage1/recurse_fwd.jl
@@ -73,6 +73,135 @@ function ∂☆builtin((f_bundle, args...))
     throw(DomainError(f, "No `ChainRulesCore.frule` found for the built-in function `$sig`"))
 end
 
+function fwd_transform(ci::CodeInfo, args...)
+    newci = copy(ci)
+    fwd_transform!(newci, args...)
+    return newci
+end
+
+function fwd_transform!(ci::CodeInfo, mi::MethodInstance, nargs::Int, N::Int)
+    new_code = Any[]
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+        debuginfo = Core.Compiler.DebugInfoStream(mi, ci.debuginfo, length(ci.code))
+        new_codelocs = Int32[]
+    else
+        new_codelocs = Any[]
+    end
+    ssa_mapping = Int[]
+    loc_mapping = Int[]
+
+    emit!(@nospecialize stmt) = stmt
+    function emit!(stmt::Expr)
+        stmt.head ∈ (:call, :(=), :new, :isdefined) || return stmt
+        push!(new_code, stmt)
+        push!(new_codelocs, isempty(new_codelocs) ? 0 : new_codelocs[end])
+        return SSAValue(length(new_code))
+    end
+
+    function mapstmt!(@nospecialize stmt)
+        if isexpr(stmt, :(=))
+            return Expr(stmt.head, emit!(mapstmt!(stmt.args[1])), emit!(mapstmt!(stmt.args[2])))
+        elseif isexpr(stmt, :call)
+            args = map(stmt.args) do stmt
+                emit!(mapstmt!(stmt))
+            end
+            return Expr(:call, ∂☆{N}(), args...)
+        elseif isexpr(stmt, :new)
+            args = map(stmt.args) do stmt
+                emit!(mapstmt!(stmt))
+            end
+            return Expr(:call, ∂☆new{N}(), args...)
+        elseif isexpr(stmt, :splatnew)
+            args = map(stmt.args) do stmt
+                emit!(mapstmt!(stmt))
+            end
+            return Expr(:call, Core._apply_iterate, FwdIterate(DNEBundle{N}(iterate)), ∂☆new{N}(), emit!(Expr(:call, tuple, args[1])), args[2:end]...)
+        elseif isa(stmt, SSAValue)
+            return SSAValue(ssa_mapping[stmt.id])
+        elseif isa(stmt, Core.SlotNumber)
+            return SlotNumber(2 + stmt.id)
+        elseif isa(stmt, Argument)
+            return SlotNumber(2 + stmt.n)
+        elseif isa(stmt, NewvarNode)
+            return NewvarNode(SlotNumber(2 + stmt.slot.id))
+        elseif isa(stmt, ReturnNode)
+            return ReturnNode(emit!(mapstmt!(stmt.val)))
+        elseif isa(stmt, GotoNode)
+            return stmt
+        elseif isa(stmt, GotoIfNot)
+            return GotoIfNot(emit!(Expr(:call, primal, emit!(mapstmt!(stmt.cond)))), stmt.dest)
+        elseif isexpr(stmt, :static_parameter)
+            return ZeroBundle{N}(mi.sparam_vals[stmt.args[1]::Int])
+        elseif isexpr(stmt, :foreigncall)
+            return Expr(:call, error, "Attempted to AD a foreigncall. Missing rule?")
+        elseif isexpr(stmt, :meta) || isexpr(stmt, :inbounds)  || isexpr(stmt, :loopinfo) ||
+               isexpr(stmt, :code_coverage_effect)
+            # Can't trust that meta annotations are still valid in the AD'd
+            # version.
+            return nothing
+        elseif isexpr(stmt, :isdefined)
+            return Expr(:call, zero_bundle{N}(), emit!(stmt))
+        # Always disable `@inbounds`, as we don't actually know if the AD'd
+        # code is truly `@inbounds` or not.
+        elseif isexpr(stmt, :boundscheck)
+            return DNEBundle{N}(true)
+        else
+            # Fallback case, for literals.
+            # If it is an Expr, then it is not a literal
+            if isa(stmt, Expr)
+                error("Unexprected statement encountered. This is a bug in Diffractor. stmt=$stmt")
+            end
+            return Expr(:call, zero_bundle{N}(), stmt)
+        end
+    end
+
+    meth = mi.def::Method
+    for i = 1:meth.nargs
+        if meth.isva && i == meth.nargs
+            args = map(i:(nargs+1)) do j::Int
+                emit!(Expr(:call, getfield, SlotNumber(2), j))
+            end
+            emit!(Expr(:(=), SlotNumber(2 + i), Expr(:call, ∂vararg{N}(), args...)))
+        else
+            emit!(Expr(:(=), SlotNumber(2 + i), Expr(:call, getfield, SlotNumber(2), i)))
+        end
+    end
+
+    for (stmt, codeloc) in zip(ci.code, @static VERSION ≥ v"1.12.0-DEV.173" ? debuginfo.codelocs : ci.codelocs)
+        push!(loc_mapping, length(new_code)+1)
+        push!(new_codelocs, codeloc)
+        push!(new_code, mapstmt!(stmt))
+        push!(ssa_mapping, length(new_code))
+    end
+
+    # Rewrite control flow
+    for (i, stmt) in enumerate(new_code)
+        if isa(stmt, GotoNode)
+            new_code[i] = GotoNode(loc_mapping[stmt.label])
+        elseif isa(stmt, GotoIfNot)
+            new_code[i] = GotoIfNot(stmt.cond, loc_mapping[stmt.dest])
+        end
+    end
+
+    ci.slotnames = Symbol[Symbol("#self#"), :args, ci.slotnames...]
+    ci.slotflags = UInt8[0x00, 0x00, ci.slotflags...]
+    ci.slottypes = ci.slottypes === nothing ? nothing : Any[Any, Any, ci.slottypes...]
+    ci.code = new_code
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+        empty!(debuginfo.codelocs)
+        append!(debuginfo.codelocs, new_codelocs)
+        ci.codelocs = Core.DebugInfo(debuginfo, length(new_code))
+    else
+        ci.codelocs = new_codelocs
+    end
+    ci.ssavaluetypes = length(new_code)
+    ci.ssaflags = UInt8[0 for i=1:length(new_code)]
+    ci.method_for_inference_limit_heuristics = meth
+    ci.edges = MethodInstance[mi]
+
+    return ci
+end
+
 function perform_fwd_transform(world::UInt, source::LineNumberNode,
                                @nospecialize(ff::Type{∂☆recurse{N}}), @nospecialize(args)) where {N}
     if all(x->x <: ZeroBundle, args)
diff --git a/src/stage2/interpreter.jl b/src/stage2/interpreter.jl
index de09698f..dd4a3711 100644
--- a/src/stage2/interpreter.jl
+++ b/src/stage2/interpreter.jl
@@ -327,13 +327,9 @@ function CC.src_inlining_policy(interp::ADInterpreter,
     ret = diffractor_inlining_policy(src, info, stmt_flag)
     ret === nothing && return false
     ret !== missing && return true
-    return CC.src_inlining_policy(interp::AbstractInterpreter,
+    return @invoke CC.src_inlining_policy(interp::AbstractInterpreter,
         src::Any, info::CC.CallInfo, stmt_flag::StmtFlag)
 end
-CC.retrieve_ir_for_inlining(cached_result::CodeInstance, src::Cthulhu.OptimizedSource) =
-    CC.retrieve_ir_for_inlining(cached_result.def, src.ir, true)
-CC.retrieve_ir_for_inlining(mi::MethodInstance, src::Cthulhu.OptimizedSource, preserve_local_sources::Bool) =
-    CC.retrieve_ir_for_inlining(mi, src.ir, preserve_local_sources)
 else
 function CC.transform_result_for_cache(interp::ADInterpreter,
     linfo::MethodInstance, valid_worlds::WorldRange, result::InferenceResult)
diff --git a/src/stage2/lattice.jl b/src/stage2/lattice.jl
index 8683a795..663b5ffe 100644
--- a/src/stage2/lattice.jl
+++ b/src/stage2/lattice.jl
@@ -1,4 +1,4 @@
-using Core.Compiler: CodeInfo, CallInfo, CallMeta
+using Core.Compiler: CallInfo, CallMeta
 import Core.Compiler: widenconst
 
 struct CompClosure; opaque; end # TODO: Is this a YAKC?