diff options
Diffstat (limited to 'powerpc')
| -rw-r--r-- | powerpc/SelectOp.vp | 7 | ||||
| -rw-r--r-- | powerpc/SelectOpproof.v | 23 |
2 files changed, 30 insertions, 0 deletions
diff --git a/powerpc/SelectOp.vp b/powerpc/SelectOp.vp index 290704bc..943c4006 100644 --- a/powerpc/SelectOp.vp +++ b/powerpc/SelectOp.vp @@ -460,3 +460,10 @@ Nondetfunction addressing (chunk: memory_chunk) (e: expr) := | _ => (Aindexed Int.zero, e:::Enil) end. +(** ** Turning an expression into a condition *) + +Nondetfunction cond_of_expr (e: expr) := + match e with + | Eop (Oandimm n) (t1:::Enil) => (Cmasknotzero n, t1:::Enil) + | _ => (Ccompuimm Cne Int.zero, e:::Enil) + end. diff --git a/powerpc/SelectOpproof.v b/powerpc/SelectOpproof.v index 39205dbd..1d35d9f8 100644 --- a/powerpc/SelectOpproof.v +++ b/powerpc/SelectOpproof.v @@ -817,5 +817,28 @@ Proof. rewrite Int.add_zero. auto. Qed. +Theorem eval_cond_of_expr: + forall le a v b, + eval_expr ge sp e m le a v -> + Val.bool_of_val v b -> + match cond_of_expr a with (cond, args) => + exists vl, + eval_exprlist ge sp e m le args vl /\ + eval_condition cond vl m = Some b + end. +Proof. + intros until v. unfold cond_of_expr; case (cond_of_expr_match a); intros; InvEval. + subst v. exists (v1 :: nil); split; auto with evalexpr. + simpl. destruct b. + generalize (Val.bool_of_true_val2 _ H0); clear H0; intro ISTRUE. + destruct v1; simpl in ISTRUE; try contradiction. + rewrite Int.eq_false; auto. + generalize (Val.bool_of_false_val2 _ H0); clear H0; intro ISFALSE. + destruct v1; simpl in ISFALSE; try contradiction. + rewrite ISFALSE. rewrite Int.eq_true; auto. + exists (v :: nil); split; auto with evalexpr. + simpl. inversion H0; simpl. rewrite Int.eq_false; auto. auto. auto. +Qed. + End CMCONSTR. |