https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94801
Bug ID: 94801
Summary: Failure to optimize narrowed __builtin_clz
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 a)
{
return __builtin_clz(a) >> 5;
}
Can be optimized to `return 0;`. This transformation is done by LLVM, but not
by GCC.
Comparison here : https://godbolt.org/z/jhqQ2u
