rex_x 77 tools/objtool/arch/x86/decode.c rex_x = 0, modrm = 0, modrm_mod = 0, modrm_rm = 0, rex_x 105 tools/objtool/arch/x86/decode.c rex_x = X86_REX_X(rex) >> 1; rex_x 273 tools/objtool/arch/x86/decode.c if (sib == 0x24 && rex_w && !rex_b && !rex_x) {