https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86140
Bug ID: 86140 Summary: constprop clones with identical bodies Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: redbeard0531 at gmail dot com Target Milestone: --- This was tweaked example code to demonstrate something totally unrelated, but I noticed it was doing the constprop clone thing for functions with identical instructions, which seemed odd. While this exact case doesn't matter, it seemed like it might be a sign of a deeper bug. https://godbolt.org/g/Zwpi7J [[gnu::noinline]] void f(const int*){ asm volatile(""); } void good() { constexpr static int arr[1000] = {}; f(arr); } void bad() { constexpr int arr[1000] = {}; f(arr); } f(int const*) [clone .constprop.0]: ret f(int const*) [clone .constprop.1]: ret f(int const*): ret good(): jmp f(int const*) [clone .constprop.0] bad(): jmp f(int const*) [clone .constprop.1]