1 files changed, 7 insertions, 0 deletions

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 03e233223af7..08e6a74fbc95 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -709,6 +709,13 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
         u64 dval;
         int sig;
 
+        /*
+         * These are giving gcc a gentle hint about what to expect in
+         * dec_inst in order to do better optimization.
+         */
+        if (!cpu_has_mmips && dec_insn.micro_mips_mode)
+                unreachable();
+
         /* XXX NEC Vr54xx bug workaround */
         if (delay_slot(xcp)) {
                 if (dec_insn.micro_mips_mode) {