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| author | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2008-12-29 12:47:56 +0000 |
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| committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2008-12-29 12:47:56 +0000 |
| commit | 12421d717405aa7964e437fc1167a23699b61ecc (patch) | |
| tree | 99b975380440ad4e91074f918ee781ec6383f0ce /backend/Selectionproof.v | |
| parent | dc4bed2cf06f46687225275131f411c86c773598 (diff) | |
| download | compcert-kvx-12421d717405aa7964e437fc1167a23699b61ecc.tar.gz compcert-kvx-12421d717405aa7964e437fc1167a23699b61ecc.zip | |
Replace cast{8,16}{signed,unsigned} with zero_ext and sign_ext.
lib/Integers.v: added more properties for ARM port.
lib/Coqlib.v: added more properties for division and powers of 2.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@928 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'backend/Selectionproof.v')
| -rw-r--r-- | backend/Selectionproof.v | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/backend/Selectionproof.v b/backend/Selectionproof.v index b7794883..6d629794 100644 --- a/backend/Selectionproof.v +++ b/backend/Selectionproof.v @@ -748,40 +748,44 @@ Qed. Theorem eval_cast8signed: forall le a v, eval_expr ge sp e m le a v -> - eval_expr ge sp e m le (cast8signed a) (Val.cast8signed v). + eval_expr ge sp e m le (cast8signed a) (Val.sign_ext 8 v). Proof. intros until v; unfold cast8signed; case (cast8signed_match a); intros; InvEval. - EvalOp. simpl. subst v. destruct v1; simpl; auto. rewrite Int.cast8_signed_idem. reflexivity. + EvalOp. simpl. subst v. destruct v1; simpl; auto. + rewrite Int.sign_ext_idem. reflexivity. compute; auto. EvalOp. Qed. Theorem eval_cast8unsigned: forall le a v, eval_expr ge sp e m le a v -> - eval_expr ge sp e m le (cast8unsigned a) (Val.cast8unsigned v). + eval_expr ge sp e m le (cast8unsigned a) (Val.zero_ext 8 v). Proof. intros until v; unfold cast8unsigned; case (cast8unsigned_match a); intros; InvEval. - EvalOp. simpl. subst v. destruct v1; simpl; auto. rewrite Int.cast8_unsigned_idem. reflexivity. + EvalOp. simpl. subst v. destruct v1; simpl; auto. + rewrite Int.zero_ext_idem. reflexivity. compute; auto. EvalOp. Qed. Theorem eval_cast16signed: forall le a v, eval_expr ge sp e m le a v -> - eval_expr ge sp e m le (cast16signed a) (Val.cast16signed v). + eval_expr ge sp e m le (cast16signed a) (Val.sign_ext 16 v). Proof. intros until v; unfold cast16signed; case (cast16signed_match a); intros; InvEval. - EvalOp. simpl. subst v. destruct v1; simpl; auto. rewrite Int.cast16_signed_idem. reflexivity. + EvalOp. simpl. subst v. destruct v1; simpl; auto. + rewrite Int.sign_ext_idem. reflexivity. compute; auto. EvalOp. Qed. Theorem eval_cast16unsigned: forall le a v, eval_expr ge sp e m le a v -> - eval_expr ge sp e m le (cast16unsigned a) (Val.cast16unsigned v). + eval_expr ge sp e m le (cast16unsigned a) (Val.zero_ext 16 v). Proof. intros until v; unfold cast16unsigned; case (cast16unsigned_match a); intros; InvEval. - EvalOp. simpl. subst v. destruct v1; simpl; auto. rewrite Int.cast16_unsigned_idem. reflexivity. + EvalOp. simpl. subst v. destruct v1; simpl; auto. + rewrite Int.zero_ext_idem. reflexivity. compute; auto. EvalOp. Qed. |