diff options
| -rw-r--r-- | miasm2/expression/expression_helper.py | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/miasm2/expression/expression_helper.py b/miasm2/expression/expression_helper.py index 3555530a..196ad5cd 100644 --- a/miasm2/expression/expression_helper.py +++ b/miasm2/expression/expression_helper.py @@ -533,3 +533,22 @@ class ExprRandom(object): cls.generated_elements = {} return got + +def _expr_cmp_gen(arg1, arg2): + return (arg2 - arg1) ^ ((arg2 ^ arg1) & ((arg2 - arg1) ^ arg2)) + +def expr_cmpu(arg1, arg2): + """ + Returns a one bit long Expression: + * 1 if @arg1 is strictly greater than @arg2 (unsigned) + * 0 otherwise. + """ + return (_expr_cmp_gen(arg1, arg2) ^ arg2 ^ arg1).msb() + +def expr_cmps(arg1, arg2): + """ + Returns a one bit long Expression: + * 1 if @arg1 is strictly greater than @arg2 (signed) + * 0 otherwise. + """ + return _expr_cmp_gen(arg1, arg2).msb() |