diff options
Diffstat (limited to 'backend/Deadcode.v')
| -rw-r--r-- | backend/Deadcode.v | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/backend/Deadcode.v b/backend/Deadcode.v index f491d678..2286876e 100644 --- a/backend/Deadcode.v +++ b/backend/Deadcode.v @@ -102,7 +102,7 @@ Function transfer_builtin (app: VA.t) (ef: external_function) nmem_add (nmem_remove nm (aaddr_arg app dst) sz) (aaddr_arg app src) sz) args else (ne, nm) - | (EF_annot _ _ | EF_annot_val _ _), _ => + | (EF_annot _ _ _ | EF_annot_val _ _ _), _ => transfer_builtin_args (kill_builtin_res res ne, nm) args | EF_debug _ _ _, _ => (kill_builtin_res res ne, nm) @@ -143,7 +143,8 @@ Definition transfer (f: function) (approx: PMap.t VA.t) | Some(Ibuiltin ef args res s) => transfer_builtin approx!!pc ef args res ne nm | Some(Icond cond args s1 s2) => - (add_needs args (needs_of_condition cond) ne, nm) + if peq s1 s2 then after else + (add_needs args (needs_of_condition cond) ne, nm) | Some(Ijumptable arg tbl) => (add_need_all arg ne, nm) | Some(Ireturn optarg) => @@ -191,6 +192,8 @@ Definition transf_instr (approx: PMap.t VA.t) (an: PMap.t NA.t) if nmem_contains (snd an!!pc) (aaddr_arg approx!!pc dst) sz then instr else Inop s + | Icond cond args s1 s2 => + if peq s1 s2 then Inop s1 else instr | _ => instr end. |