https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108162
--- Comment #3 from Levo DeLellis <levo.delellis at gmail dot com> --- (In reply to Andrew Pinski from comment #2) > Round 4 is because of this heuriheuristics. Name the function something > besides main and try again. I couldn't reproduce. fn has more than xor eax/ret. godbolt shows the same. x86-64 12.2 https://gcc.godbolt.org/z/WdacrE788 #include <vector> int fn() { std::vector<int> v; v.push_back(1000); return 0; } int main(int argc, char *argv[]) { fn(); } 0000000000001160 <_Z2fnv>: 1160: 48 83 ec 08 sub rsp,0x8 1164: bf 04 00 00 00 mov edi,0x4 1169: e8 c2 fe ff ff call 1030 <_Znwm@plt> 116e: be 04 00 00 00 mov esi,0x4 1173: 48 89 c7 mov rdi,rax 1176: c7 00 e8 03 00 00 mov DWORD PTR [rax],0x3e8 117c: e8 bf fe ff ff call 1040 <_ZdlPvm@plt> 1181: 31 c0 xor eax,eax 1183: 48 83 c4 08 add rsp,0x8 1187: c3 ret
