https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111439
Bug ID: 111439
Summary: some boolean related transformation to `~(a&b)`
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Take
```
bool foo0(bool a, bool b)
{
return (a <= b) ^ a;
}
bool foo1(bool a, bool b)
{
return (!a | b) ^ a;
}
bool foo2(bool b, int x, int y)
{
bool a = x == y;
return (!a | b) ^ a;
}
```
These all should be optimized to `~(a&b)`.
Right now foo1 is optimized at -O2 but not -O1 due to PR 111149 (canonical form
of a ^ b or a != b for booleans).
foo2 can be handled at -O2 if we use bitwise_inverted_equal_p instead of
bitwise_equal_p (with bit_not).
foo0 will just need a new pattern really. we do need to make a decision on the
canonical form, is it `~a | b` or `a <= b` but both show currently too.
