compiler: run IPSCCP.

whitequark · whitequark · commit f81930ffd6ed · 2016-03-27T02:00:05.000Z
This doesn't do much, only frees some registers.
diff --git a/artiq/compiler/targets.py b/artiq/compiler/targets.py
@@ -101,10 +101,13 @@ def optimize(self, llmodule):
 
         # Now, actually optimize the code.
         llpassmgr.add_function_inlining_pass(275)
+        llpassmgr.add_ipsccp_pass()
         llpassmgr.add_instruction_combining_pass()
+        llpassmgr.add_gvn_pass()
         llpassmgr.add_cfg_simplification_pass()
+
+        # Clean up after optimizing.
         llpassmgr.add_dead_arg_elimination_pass()
-        llpassmgr.add_gvn_pass()
         llpassmgr.add_global_dce_pass()
 
         llpassmgr.run(llmodule)
