Fix interpreter caches (#1698)

* Sdebug alloc inline

* Update Project.toml

* Update Enzyme.jl

* Update compiler.jl

* Update compiler.jl

* Update compiler.jl

* Fix 1.6/1.7

src/compiler.jl

@@ -3361,20 +3361,38 @@ struct EnzymeCacheToken
     always_inline
     method_table::Core.MethodTable
     param_type::Type
-    mode::API.CDerivativeMode
+    is_fwd::API.CDerivativeMode
 end
 
 GPUCompiler.ci_cache_token(job::CompilerJob{<:Any,<:AbstractEnzymeCompilerParams}) =
     EnzymeCacheToken(
         typeof(job.config.target), job.config.always_inline, GPUCompiler.method_table(job),
-        typeof(job.config.params), job.config.params.mode,
+        typeof(job.config.params), job.config.params.mode == API.DEM_ForwardMode,
     )
 
 GPUCompiler.get_interpreter(job::CompilerJob{<:Any,<:AbstractEnzymeCompilerParams}) =
     Interpreter.EnzymeInterpreter(GPUCompiler.ci_cache_token(job), GPUCompiler.method_table(job), job.world, job.config.params.mode)
 else
+
+# the codeinstance cache to use -- should only be used for the constructor
+# Note that the only way the interpreter modifies codegen is either not inlining a fwd mode
+# rule or not inlining a rev mode rule. Otherwise, all caches can be re-used.
+const GLOBAL_FWD_CACHE = GPUCompiler.CodeCache()
+const GLOBAL_REV_CACHE = GPUCompiler.CodeCache()
+function enzyme_ci_cache(job::CompilerJob{<:Any,<:AbstractEnzymeCompilerParams})
+    return if job.config.params.mode == API.DEM_ForwardMode
+        GLOBAL_FWD_CACHE
+    else
+        GLOBAL_REV_CACHE
+    end
+end
+
+@static if VERSION < v"1.8"
+GPUCompiler.ci_cache(job::CompilerJob{<:Any,<:AbstractEnzymeCompilerParams}) = enzyme_ci_cache(job)
+end
+
 GPUCompiler.get_interpreter(job::CompilerJob{<:Any,<:AbstractEnzymeCompilerParams}) =
-    Interpreter.EnzymeInterpreter(GPUCompiler.ci_cache(job), GPUCompiler.method_table(job), job.world, job.config.params.mode)
+    Interpreter.EnzymeInterpreter(enzyme_ci_cache(job), GPUCompiler.method_table(job), job.world, job.config.params.mode)
 end
 
 include("compiler/passes.jl")
@@ -6952,7 +6970,7 @@ end
         run_enzyme = false
         Const
 	else
-    A
+        A
     end
 
     if run_enzyme && !(A2 <: Const) && guaranteed_const_nongen(rrt, World)