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author | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-13 14:02:07 +0000 |
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committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2013-07-13 14:02:07 +0000 |
commit | f995bde28d1098b51f42a38f3577b903d0420688 (patch) | |
tree | fb0bf1845a3dad1cca50331edebdf05f6864f68d /common/Values.v | |
parent | bdac1f6aba5370b21b34c9ee12429c3920b3dffb (diff) | |
download | compcert-f995bde28d1098b51f42a38f3577b903d0420688.tar.gz compcert-f995bde28d1098b51f42a38f3577b903d0420688.zip |
More accurate model of condition register flags for ARM and IA32.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2297 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'common/Values.v')
-rw-r--r-- | common/Values.v | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/common/Values.v b/common/Values.v index b937071c..05749b7f 100644 --- a/common/Values.v +++ b/common/Values.v @@ -262,6 +262,18 @@ Definition add_carry (v1 v2 cin: val): val := | _, _, _ => Vundef end. +Definition sub_overflow (v1 v2: val) : val := + match v1, v2 with + | Vint n1, Vint n2 => Vint(Int.sub_overflow n1 n2 Int.zero) + | _, _ => Vundef + end. + +Definition negative (v: val) : val := + match v with + | Vint n => Vint (Int.negative n) + | _ => Vundef + end. + Definition and (v1 v2: val): val := match v1, v2 with | Vint n1, Vint n2 => Vint(Int.and n1 n2) |