https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115047
Wentao Zhang <wentaoz5 at illinois dot edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #3 from Wentao Zhang <wentaoz5 at illinois dot edu> ---
Jørgen, thank you for the info! I just realized this had been somewhat
discussed
between you and Alan on LLVM discourse [2]. From Alan's description I think
LLVM
is adopting unique-cause MC/DC. I might explicitly ask them for confirmation.
> does f(0, 0, 1); f(0, 0, 0); cover c?
Yes
1| 2|void f(int a, int b, int c) { a && b || c; }
------------------
|---> MC/DC Decision Region (1:31) to (1:42)
|
| Number of Conditions: 3
| Condition C1 --> (1:31)
| Condition C2 --> (1:36)
| Condition C3 --> (1:41)
|
| Executed MC/DC Test Vectors:
|
| C1, C2, C3 Result
| 1 { F, -, F = F }
| 2 { F, -, T = T }
|
| C1-Pair: not covered
| C2-Pair: not covered
| C3-Pair: covered: (1,2)
| MC/DC Coverage for Decision: 33.33%
|
------------------
2| 1|int main(void) {
3| 1| f(0,0,1);
4| 1| f(0,0,0);
5| 1| return 0;
6| 1|}
7| |
I guess it would be desirable to (1) let LLVM support masking MC/DC and (2) let
gcov support unique-cause MC/DC. The first seems easier and I might try
implementing a prototype.
[2] https://discourse.llvm.org/t/rfc-source-based-mc-dc-code-coverage/59244/9
Thanks,
Wentao
