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C++: Add support for bounded modulus operations

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This commit is contained in:
Jeroen Ketema
2023-03-24 11:51:38 +01:00
parent 62d2f23904
commit 99c6111b05
2 changed files with 50 additions and 6 deletions
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27
cpp/ql/test/library-tests/ir/range-analysis/SimpleRangeAnalysis_tests.cpp
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@@ -18,20 +18,20 @@ int test2(struct List* p) {
int count = 0;
for (; p; p = p->next) {
count = (count+1) % 10;
range(count); // $ range=<=9
range(count); // $ range=>=-9 range=<=9
}
range(count); // $ range=<=9
range(count); // $ range=>=-9 range=<=9
return count;
}
int test3(struct List* p) {
int count = 0;
for (; p; p = p->next) {
range(count++); // $ range=<=9
range(count++); // $ range=>=-9 range=<=9
count = count % 10;
range(count); // $ range=<=9
range(count); // $ range=>=-9 range=<=9
}
range(count); // $ range=<=9
range(count); // $ range=>=-9 range=<=9
return count;
}
@@ -960,7 +960,22 @@ void guard_bound_out_of_range(void) {
void test_mod(int s) {
int s2 = s % 5;
range(s2); // $ range=<=4 // -4 .. 4
range(s2); // $ range=>=-4 range=<=4
}
void test_mod_neg(int s) {
int s2 = s % -5;
range(s2); // $ range=>=-4 range=<=4
}
void test_mod_ternary(int s, bool b) {
int s2 = s % (b ? 5 : 500);
range(s2); // $ range=>=-499 range=<=499
}
void test_mod_ternary2(int s, bool b1, bool b2) {
int s2 = s % (b1 ? (b2 ? 5 : -5000) : -500000);
range(s2); // $ range=>=-499999 range=<=499999
}
void exit(int);