MIPS_CPU_NAN_LEGACY
#define cpu_has_nan_legacy __isa_lt_and_opt(6, MIPS_CPU_NAN_LEGACY)
c->options |= MIPS_CPU_NAN_LEGACY;
c->options |= MIPS_CPU_NAN_LEGACY;
c->options |= MIPS_CPU_NAN_LEGACY;
c->options &= ~(MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY);
c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY;
c->options |= MIPS_CPU_NAN_LEGACY;
c->options |= MIPS_CPU_NAN_LEGACY;
c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY;