feat[venom]: add support for no optimizations

vyper/venom/__init__.py

@@ -43,17 +43,22 @@ def generate_assembly_experimental(
 
 def _run_passes(fn: IRFunction, optimize: OptimizationLevel) -> None:
  # Run passes on Venom IR
- # TODO: Add support for optimization levels
 
  ac = IRAnalysesCache(fn)
-
  SimplifyCFGPass(ac, fn).run_pass()
  MakeSSA(ac, fn).run_pass()
+
+ if optimize == OptimizationLevel.NONE:
+ StoreExpansionPass(ac, fn).run_pass()
+ return
+
  Mem2Var(ac, fn).run_pass()
  MakeSSA(ac, fn).run_pass()
+
  SCCP(ac, fn).run_pass()
  StoreElimination(ac, fn).run_pass()
  SimplifyCFGPass(ac, fn).run_pass()
+
  AlgebraicOptimizationPass(ac, fn).run_pass()
  # NOTE: MakeSSA is after algebraic optimization it currently produces
  # smaller code by adding some redundant phi nodes. This is not a
@@ -62,9 +67,12 @@ def _run_passes(fn: IRFunction, optimize: OptimizationLevel) -> None:
  # without making the code generation more expensive by running
  # MakeSSA again.
  MakeSSA(ac, fn).run_pass()
+
  BranchOptimizationPass(ac, fn).run_pass()
  RemoveUnusedVariablesPass(ac, fn).run_pass()
 
+ # TODO: codesize optimizations, e.g. for literals
+
  StoreExpansionPass(ac, fn).run_pass()
  DFTPass(ac, fn).run_pass()