https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94916
Bug ID: 94916
Summary: Failure to optimize pattern into difference or zero
selector
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gabravier at gmail dot com
Target Milestone: ---
int f(int x, int y)
{
return (x - y) & -(x >= y);
}
This can be optimized to return x >= y ? x - y : 0. LLVM does this
transformation, but GCC does not. (also, GCC fails to optimize the resulting
pattern properly, but this is already reported in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94898)
