https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94796
Bug ID: 94796
Summary: Failure to reuse flags from substraction
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int f(int a, int b)
{
return ((a == b) & (a - b));
}
The `a == b` is able to use condition flags resulting from `a - b`, and thus
avoid an extra compare. LLVM does this transformation, but GCC does not.
https://godbolt.org/z/SHvTW8
