diff --git a/qemu/target/m68k/translate.c b/qemu/target/m68k/translate.c
index 2047ab37..22908632 100644
--- a/qemu/target/m68k/translate.c
+++ b/qemu/target/m68k/translate.c
@@ -667,6 +667,21 @@ static inline int insn_opsize(int insn)
     }
 }
 
+static inline int ext_opsize(int ext, int pos)
+{
+    switch ((ext >> pos) & 7) {
+    case 0: return OS_LONG;
+    case 1: return OS_SINGLE;
+    case 2: return OS_EXTENDED;
+    case 3: return OS_PACKED;
+    case 4: return OS_WORD;
+    case 5: return OS_DOUBLE;
+    case 6: return OS_BYTE;
+    default:
+        g_assert_not_reached();
+    }
+}
+
 /* Assign value to a register.  If the width is less than the register width
    only the low part of the register is set.  */
 static void gen_partset_reg(DisasContext *s, int opsize, TCGv reg, TCGv val)
@@ -4269,20 +4284,18 @@ DISAS_INSN(fpu)
         tmp32 = tcg_temp_new_i32(tcg_ctx);
         /* fmove */
         /* ??? TODO: Proper behavior on overflow.  */
-        switch ((ext >> 10) & 7) {
-        case 0:
-            opsize = OS_LONG;
+        opsize = ext_opsize(ext, 10);
+        switch (opsize) {
+        case OS_LONG:
             gen_helper_f64_to_i32(tcg_ctx, tmp32, tcg_ctx->cpu_env, src);
             break;
-        case 1:
-            opsize = OS_SINGLE;
+        case OS_SINGLE:
             gen_helper_f64_to_f32(tcg_ctx, tmp32, tcg_ctx->cpu_env, src);
             break;
-        case 4:
-            opsize = OS_WORD;
+        case OS_WORD:
             gen_helper_f64_to_i32(tcg_ctx, tmp32, tcg_ctx->cpu_env, src);
             break;
-        case 5: /* OS_DOUBLE */
+        case OS_DOUBLE:
             tcg_gen_mov_i32(tcg_ctx, tmp32, AREG(insn, 0));
             switch ((insn >> 3) & 7) {
             case 2:
@@ -4311,8 +4324,7 @@ DISAS_INSN(fpu)
             }
             tcg_temp_free_i32(tcg_ctx, tmp32);
             return;
-        case 6:
-            opsize = OS_BYTE;
+        case OS_BYTE:
             gen_helper_f64_to_i32(tcg_ctx, tmp32, tcg_ctx->cpu_env, src);
             break;
         default:
@@ -4385,15 +4397,7 @@ DISAS_INSN(fpu)
     }
     if (ext & (1 << 14)) {
         /* Source effective address.  */
-        switch ((ext >> 10) & 7) {
-        case 0: opsize = OS_LONG; break;
-        case 1: opsize = OS_SINGLE; break;
-        case 4: opsize = OS_WORD; break;
-        case 5: opsize = OS_DOUBLE; break;
-        case 6: opsize = OS_BYTE; break;
-        default:
-            goto undef;
-        }
+        opsize = ext_opsize(ext, 10);
         if (opsize == OS_DOUBLE) {
             tmp32 = tcg_temp_new_i32(tcg_ctx);
             tcg_gen_mov_i32(tcg_ctx, tmp32, AREG(insn, 0));