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| author | David Monniaux <david.monniaux@univ-grenoble-alpes.fr> | 2019-05-11 15:20:02 +0200 |
|---|---|---|
| committer | David Monniaux <david.monniaux@univ-grenoble-alpes.fr> | 2019-05-11 15:20:02 +0200 |
| commit | 2c428ad4e0177756db2f6dfe56831b5a44f6de5c (patch) | |
| tree | 1e209b6c935e36005b31542345ac8bb593361452 /mppa_k1c/ExtValues.v | |
| parent | 3ef3e6c78026cc1d5793ccb4e905a0232ec7bb4e (diff) | |
| download | compcert-kvx-2c428ad4e0177756db2f6dfe56831b5a44f6de5c.tar.gz compcert-kvx-2c428ad4e0177756db2f6dfe56831b5a44f6de5c.zip | |
add with shift, beginning
Diffstat (limited to 'mppa_k1c/ExtValues.v')
| -rw-r--r-- | mppa_k1c/ExtValues.v | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mppa_k1c/ExtValues.v b/mppa_k1c/ExtValues.v index 735d5c3c..32d84b60 100644 --- a/mppa_k1c/ExtValues.v +++ b/mppa_k1c/ExtValues.v @@ -13,6 +13,28 @@ Definition z_of_shift1_4 (x : shift1_4) := | SHIFT4 => 4 end. +Definition shift1_4_of_z (x : Z) := + if Z.eq_dec x 1 then Some SHIFT1 + else if Z.eq_dec x 2 then Some SHIFT2 + else if Z.eq_dec x 3 then Some SHIFT3 + else if Z.eq_dec x 4 then Some SHIFT4 + else None. + +Lemma shift1_4_of_z_correct : + forall z, + match shift1_4_of_z z with + | Some x => z_of_shift1_4 x = z + | None => True + end. +Proof. + intro. unfold shift1_4_of_z. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + trivial. +Qed. + Definition int_of_shift1_4 (x : shift1_4) := Int.repr (z_of_shift1_4 x). @@ -178,3 +200,5 @@ Proof. apply Int64.neg_mul_distr_r. Qed. +Definition addx sh v1 v2 := + Val.add v2 (Val.shl v1 (Vint sh)).
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