https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87223
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords|ra | Severity|normal |enhancement --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The trunk (for 64bit) produces: xor eax, eax xor edx, edx mov BYTE PTR [rdi], 0 mov QWORD PTR [rdi+8], rax mov WORD PTR [rdi+16], 0 mov QWORD PTR [rdi+24], rdx Which is better but still misses out and uses two registers instead of one.