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author | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2012-07-01 07:51:12 +0000 |
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committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2012-07-01 07:51:12 +0000 |
commit | 4abaa3fa312fcbe7ee9665853f52a5d37e703864 (patch) | |
tree | 8fb982f2dd6fca8990708aa30a04e537c38ab395 /ia32/CombineOp.v | |
parent | 9b8f0f6c4683dd00ee0e3422b84c9cc34510011e (diff) | |
download | compcert-4abaa3fa312fcbe7ee9665853f52a5d37e703864.tar.gz compcert-4abaa3fa312fcbe7ee9665853f52a5d37e703864.zip |
Recombine x = cmp(...); if (x == 1) ...
and x = cmp(...); if (x != 1) ...
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1946 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'ia32/CombineOp.v')
-rw-r--r-- | ia32/CombineOp.v | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/ia32/CombineOp.v b/ia32/CombineOp.v index 1391f556..07d5a79a 100644 --- a/ia32/CombineOp.v +++ b/ia32/CombineOp.v @@ -43,16 +43,36 @@ Function combine_compimm_eq_0 (x: valnum) : option(condition * list valnum) := | _ => None end. +Function combine_compimm_eq_1 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (c, ys) + | _ => None + end. + +Function combine_compimm_ne_1 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (negate_condition c, ys) + | _ => None + end. + Function combine_cond (cond: condition) (args: list valnum) : option(condition * list valnum) := match cond, args with | Ccompimm Cne n, x::nil => - if Int.eq_dec n Int.zero then combine_compimm_ne_0 x else None + if Int.eq_dec n Int.zero then combine_compimm_ne_0 x + else if Int.eq_dec n Int.one then combine_compimm_ne_1 x + else None | Ccompimm Ceq n, x::nil => - if Int.eq_dec n Int.zero then combine_compimm_eq_0 x else None + if Int.eq_dec n Int.zero then combine_compimm_eq_0 x + else if Int.eq_dec n Int.one then combine_compimm_eq_1 x + else None | Ccompuimm Cne n, x::nil => - if Int.eq_dec n Int.zero then combine_compimm_ne_0 x else None + if Int.eq_dec n Int.zero then combine_compimm_ne_0 x + else if Int.eq_dec n Int.one then combine_compimm_ne_1 x + else None | Ccompuimm Ceq n, x::nil => - if Int.eq_dec n Int.zero then combine_compimm_eq_0 x else None + if Int.eq_dec n Int.zero then combine_compimm_eq_0 x + else if Int.eq_dec n Int.one then combine_compimm_eq_1 x + else None | _, _ => None end. |