https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95534
Bug ID: 95534 Summary: Failure to optimize out atoi when used as operand of _tzcnt_u64 Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: gabravier at gmail dot com Target Milestone: --- #include <x86intrin.h> void f(char *s) { _tzcnt_u64(atol(s)); } This can be optimized to doing nothing.