https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96688
Bug ID: 96688
Summary: Failure to optimize shift-right+not of constant to
avoid not
Product: gcc
Version: 11.0
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)
{
return ~(123 >> x);
}
This return in this code can be optimized to `return ~123 >> x;`, and the same
optimization is possible where 123 is replaced by essentially any constant.
This transformation is done by LLVM, but not by GCC.
