diff mbox

[v3,1/7] target/m68k: add fscc.

Message ID 20170627191221.31650-2-laurent@vivier.eu (mailing list archive)
State New, archived
Headers show

Commit Message

Laurent Vivier June 27, 2017, 7:12 p.m. UTC 
use DisasCompare with FPU conditions in fscc and fbcc.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 target/m68k/translate.c | 211 ++++++++++++++++++++++++++++++------------------
 1 file changed, 132 insertions(+), 79 deletions(-)

Comments

Richard Henderson June 27, 2017, 8 p.m. UTC | #1 
On 06/27/2017 12:12 PM, Laurent Vivier wrote:
>       case 3:  /* Ordered Greater than or Equal Z || !(A || N) */
>       case 19: /* Greater than or Equal Z || !(A || N) */
> +        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
> +        c->v1 = tcg_temp_new();
> +        c->g1 = 0;
> +        tcg_gen_shli_i32(c->v1, fpsr, 3);
> +        tcg_gen_or_i32(c->v1, c->v1, fpsr);
> +        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_Z);
> +        c->tcond = TCG_COND_NE;

Still with the unmasked shift.

	tcg_gen_not_i32(c->v1, fpsr);
	tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);
	tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_Z);
	tcg_gen_or_i32(c->v1, c->v1, fpsr);


>       case 5:  /* Ordered Less than or Equal Z || (N && !A) */
>       case 21: /* Less than or Equal Z || (N && !A) */
> +        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
> +        c->v1 = tcg_temp_new();
> +        c->g1 = 0;
> +        tcg_gen_xori_i32(c->v1, fpsr, FPSR_CC_A);
> +        tcg_gen_shli_i32(c->v1, c->v1, 3);
> +        tcg_gen_ori_i32(c->v1, c->v1, FPSR_CC_Z);
> +        tcg_gen_and_i32(c->v1, c->v1, fpsr);
> +        c->tcond = TCG_COND_NE;

Likewise.

	tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A);
	tcg_gen_shli_i32(c->v1, c->v1, ctz32(FPSR_CC_N) - ctz32(FPSR_CC_A));
	tcg_gen_andc_i32(c->v1, fpsr, c->v1);
	tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_Z | FPSR_CC_N);


>       case 10: /* Unordered or Greater Than A || !(N || Z)) */
>       case 26: /* Not Less or Equal A || !(N || Z)) */
> +        g_assert(FPSR_CC_Z == (FPSR_CC_N >> 1));
> +        c->v1 = tcg_temp_new();
> +        c->g1 = 0;
> +        tcg_gen_shli_i32(c->v1, fpsr, 1);
> +        tcg_gen_or_i32(c->v1, c->v1, fpsr);
> +        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_A);
> +        c->tcond = TCG_COND_NE;

Likewise.

	tcg_gen_not_i32(c->v1, fpsr);
	tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_Z | FPSR_CC_N);
	tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_A);
	tcg_gen_or_i32(c->v1, c->v1, fpsr);


>       case 12: /* Unordered or Less Than A || (N && !Z) */
>       case 28: /* Not Greater than or Equal A || (N && !Z) */
> +        c->v1 = tcg_temp_new();
> +        c->g1 = 0;
> +        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_Z);
> +        tcg_gen_shli_i32(c->v1, c->v1, ctz32(FPSR_CC_N) - ctz32(FPSR_CC_Z));
> +        tcg_gen_andc_i32(c->v1, fpsr, c->v1);
> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);
> +        c->tcond = TCG_COND_NE;

I hadn't meant that this was the only one to fix.


r~
Laurent Vivier June 28, 2017, 12:03 a.m. UTC | #2 
Le 27/06/2017 à 22:00, Richard Henderson a écrit :
> On 06/27/2017 12:12 PM, Laurent Vivier wrote:
>>       case 3:  /* Ordered Greater than or Equal Z || !(A || N) */
>>       case 19: /* Greater than or Equal Z || !(A || N) */
>> +        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
>> +        c->v1 = tcg_temp_new();
>> +        c->g1 = 0;
>> +        tcg_gen_shli_i32(c->v1, fpsr, 3);
>> +        tcg_gen_or_i32(c->v1, c->v1, fpsr);
>> +        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
>> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_Z);
>> +        c->tcond = TCG_COND_NE;
> 
> Still with the unmasked shift.
> 
>     tcg_gen_not_i32(c->v1, fpsr);
>     tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);
>     tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_Z);
>     tcg_gen_or_i32(c->v1, c->v1, fpsr);
> 
> 
>>       case 5:  /* Ordered Less than or Equal Z || (N && !A) */
>>       case 21: /* Less than or Equal Z || (N && !A) */
>> +        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
>> +        c->v1 = tcg_temp_new();
>> +        c->g1 = 0;
>> +        tcg_gen_xori_i32(c->v1, fpsr, FPSR_CC_A);
>> +        tcg_gen_shli_i32(c->v1, c->v1, 3);
>> +        tcg_gen_ori_i32(c->v1, c->v1, FPSR_CC_Z);
>> +        tcg_gen_and_i32(c->v1, c->v1, fpsr);
>> +        c->tcond = TCG_COND_NE;
> 
> Likewise.
> 
>     tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A);
>     tcg_gen_shli_i32(c->v1, c->v1, ctz32(FPSR_CC_N) - ctz32(FPSR_CC_A));
>     tcg_gen_andc_i32(c->v1, fpsr, c->v1);
>     tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_Z | FPSR_CC_N);
> 
> 
>>       case 10: /* Unordered or Greater Than A || !(N || Z)) */
>>       case 26: /* Not Less or Equal A || !(N || Z)) */
>> +        g_assert(FPSR_CC_Z == (FPSR_CC_N >> 1));
>> +        c->v1 = tcg_temp_new();
>> +        c->g1 = 0;
>> +        tcg_gen_shli_i32(c->v1, fpsr, 1);
>> +        tcg_gen_or_i32(c->v1, c->v1, fpsr);
>> +        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
>> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_A);
>> +        c->tcond = TCG_COND_NE;
> 
> Likewise.
> 
>     tcg_gen_not_i32(c->v1, fpsr);
>     tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_Z | FPSR_CC_N);
>     tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_A);
>     tcg_gen_or_i32(c->v1, c->v1, fpsr);
> 
> 
>>       case 12: /* Unordered or Less Than A || (N && !Z) */
>>       case 28: /* Not Greater than or Equal A || (N && !Z) */
>> +        c->v1 = tcg_temp_new();
>> +        c->g1 = 0;
>> +        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_Z);
>> +        tcg_gen_shli_i32(c->v1, c->v1, ctz32(FPSR_CC_N) -
>> ctz32(FPSR_CC_Z));
>> +        tcg_gen_andc_i32(c->v1, fpsr, c->v1);
>> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);
>> +        c->tcond = TCG_COND_NE;
> 
> I hadn't meant that this was the only one to fix.
> 

Thank you Richard, but all these changes break something somewhere, I'm
searching why.

Thanks,
Laurent
Laurent Vivier June 28, 2017, 8:05 p.m. UTC | #3 
Le 27/06/2017 à 22:00, Richard Henderson a écrit :
> On 06/27/2017 12:12 PM, Laurent Vivier wrote:
>>       case 3:  /* Ordered Greater than or Equal Z || !(A || N) */
>>       case 19: /* Greater than or Equal Z || !(A || N) */
>> +        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
>> +        c->v1 = tcg_temp_new();
>> +        c->g1 = 0;
>> +        tcg_gen_shli_i32(c->v1, fpsr, 3);
>> +        tcg_gen_or_i32(c->v1, c->v1, fpsr);
>> +        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
>> +        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_Z);
>> +        c->tcond = TCG_COND_NE;
> 
> Still with the unmasked shift.
> 
>     tcg_gen_not_i32(c->v1, fpsr);
>     tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);

We want to compute !(A || N), but I think this is (!A || !N)

>     tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_Z);
>     tcg_gen_or_i32(c->v1, c->v1, fpsr);

So we have Z || !A || !N

Do you think we can do better than:

     tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A);
     tcg_gen_shli_i32(c->v1, c->v1,
                      ctz32(FPSR_CC_N) - ctz32(FPSR_CC_A));
     tcg_gen_andi_i32(fpsr, fpsr, FPSR_CC_Z | FPSR_CC_N);
     tcg_gen_or_i32(c->v1, c->v1, fpsr);
     tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);

Thanks,
Laurent
diff mbox

Patch

diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 7aa0fdc..dff604c 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4633,142 +4633,194 @@  undef:
     disas_undef_fpu(env, s, insn);
 }
 
-DISAS_INSN(fbcc)
+static void gen_fcc_cond(DisasCompare *c, DisasContext *s, int cond)
 {
-    uint32_t offset;
-    uint32_t addr;
-    TCGLabel *l1;
-    TCGv tmp, fpsr;
-
-    addr = s->pc;
-    offset = cpu_ldsw_code(env, s->pc);
-    s->pc += 2;
-    if (insn & (1 << 6)) {
-        offset = (offset << 16) | read_im16(env, s);
-    }
+    TCGv fpsr;
 
+    c->g1 = 1;
+    c->v2 = tcg_const_i32(0);
+    c->g2 = 0;
+    /* TODO: Raise BSUN exception.  */
     fpsr = tcg_temp_new();
     gen_load_fcr(s, fpsr, M68K_FPSR);
-    l1 = gen_new_label();
-    /* TODO: Raise BSUN exception.  */
-    /* Jump to l1 if condition is true.  */
-    switch (insn & 0x3f)  {
+    switch (cond) {
     case 0:  /* False */
     case 16: /* Signaling False */
+        c->v1 = c->v2;
+        c->tcond = TCG_COND_NEVER;
         break;
     case 1:  /* EQual Z */
     case 17: /* Signaling EQual Z */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_Z);
+        c->tcond = TCG_COND_NE;
         break;
     case 2:  /* Ordered Greater Than !(A || Z || N) */
     case 18: /* Greater Than !(A || Z || N) */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr,
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr,
                          FPSR_CC_A | FPSR_CC_Z | FPSR_CC_N);
-        tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
+        c->tcond = TCG_COND_EQ;
         break;
     case 3:  /* Ordered Greater than or Equal Z || !(A || N) */
     case 19: /* Greater than or Equal Z || !(A || N) */
-        assert(FPSR_CC_A == (FPSR_CC_N >> 3));
-        tmp = tcg_temp_new();
-        tcg_gen_shli_i32(tmp, fpsr, 3);
-        tcg_gen_or_i32(tmp, tmp, fpsr);
-        tcg_gen_xori_i32(tmp, tmp, FPSR_CC_N);
-        tcg_gen_andi_i32(tmp, tmp, FPSR_CC_N | FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_shli_i32(c->v1, fpsr, 3);
+        tcg_gen_or_i32(c->v1, c->v1, fpsr);
+        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
+        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_Z);
+        c->tcond = TCG_COND_NE;
         break;
     case 4:  /* Ordered Less Than !(!N || A || Z); */
     case 20: /* Less Than !(!N || A || Z); */
-        tmp = tcg_temp_new();
-        tcg_gen_xori_i32(tmp, fpsr, FPSR_CC_N);
-        tcg_gen_andi_i32(tmp, tmp, FPSR_CC_N | FPSR_CC_A | FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_xori_i32(c->v1, fpsr, FPSR_CC_N);
+        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_A | FPSR_CC_Z);
+        c->tcond = TCG_COND_EQ;
         break;
     case 5:  /* Ordered Less than or Equal Z || (N && !A) */
     case 21: /* Less than or Equal Z || (N && !A) */
-        assert(FPSR_CC_A == (FPSR_CC_N >> 3));
-        tmp = tcg_temp_new();
-        tcg_gen_xori_i32(tmp, fpsr, FPSR_CC_A);
-        tcg_gen_shli_i32(tmp, tmp, 3);
-        tcg_gen_ori_i32(tmp, tmp, FPSR_CC_Z);
-        tcg_gen_and_i32(tmp, tmp, fpsr);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        g_assert(FPSR_CC_A == (FPSR_CC_N >> 3));
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_xori_i32(c->v1, fpsr, FPSR_CC_A);
+        tcg_gen_shli_i32(c->v1, c->v1, 3);
+        tcg_gen_ori_i32(c->v1, c->v1, FPSR_CC_Z);
+        tcg_gen_and_i32(c->v1, c->v1, fpsr);
+        c->tcond = TCG_COND_NE;
         break;
     case 6:  /* Ordered Greater or Less than !(A || Z) */
     case 22: /* Greater or Less than !(A || Z) */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A | FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A | FPSR_CC_Z);
+        c->tcond = TCG_COND_EQ;
         break;
     case 7:  /* Ordered !A */
     case 23: /* Greater, Less or Equal !A */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A);
-        tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A);
+        c->tcond = TCG_COND_EQ;
         break;
     case 8:  /* Unordered A */
     case 24: /* Not Greater, Less or Equal A */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A);
+        c->tcond = TCG_COND_NE;
         break;
     case 9:  /* Unordered or Equal A || Z */
     case 25: /* Not Greater or Less then A || Z */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A | FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A | FPSR_CC_Z);
+        c->tcond = TCG_COND_NE;
         break;
     case 10: /* Unordered or Greater Than A || !(N || Z)) */
     case 26: /* Not Less or Equal A || !(N || Z)) */
-        assert(FPSR_CC_Z == (FPSR_CC_N >> 1));
-        tmp = tcg_temp_new();
-        tcg_gen_shli_i32(tmp, fpsr, 1);
-        tcg_gen_or_i32(tmp, tmp, fpsr);
-        tcg_gen_xori_i32(tmp, tmp, FPSR_CC_N);
-        tcg_gen_andi_i32(tmp, tmp, FPSR_CC_N | FPSR_CC_A);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        g_assert(FPSR_CC_Z == (FPSR_CC_N >> 1));
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_shli_i32(c->v1, fpsr, 1);
+        tcg_gen_or_i32(c->v1, c->v1, fpsr);
+        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
+        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_N | FPSR_CC_A);
+        c->tcond = TCG_COND_NE;
         break;
     case 11: /* Unordered or Greater or Equal A || Z || !N */
     case 27: /* Not Less Than A || Z || !N */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A | FPSR_CC_Z | FPSR_CC_N);
-        tcg_gen_xori_i32(tmp, tmp, FPSR_CC_N);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A | FPSR_CC_Z | FPSR_CC_N);
+        tcg_gen_xori_i32(c->v1, c->v1, FPSR_CC_N);
+        c->tcond = TCG_COND_NE;
         break;
     case 12: /* Unordered or Less Than A || (N && !Z) */
     case 28: /* Not Greater than or Equal A || (N && !Z) */
-        assert(FPSR_CC_Z == (FPSR_CC_N >> 1));
-        tmp = tcg_temp_new();
-        tcg_gen_xori_i32(tmp, fpsr, FPSR_CC_Z);
-        tcg_gen_shli_i32(tmp, tmp, 1);
-        tcg_gen_ori_i32(tmp, tmp, FPSR_CC_A);
-        tcg_gen_and_i32(tmp, tmp, fpsr);
-        tcg_gen_andi_i32(tmp, tmp, FPSR_CC_A | FPSR_CC_N);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_Z);
+        tcg_gen_shli_i32(c->v1, c->v1, ctz32(FPSR_CC_N) - ctz32(FPSR_CC_Z));
+        tcg_gen_andc_i32(c->v1, fpsr, c->v1);
+        tcg_gen_andi_i32(c->v1, c->v1, FPSR_CC_A | FPSR_CC_N);
+        c->tcond = TCG_COND_NE;
         break;
     case 13: /* Unordered or Less or Equal A || Z || N */
     case 29: /* Not Greater Than A || Z || N */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_A | FPSR_CC_Z | FPSR_CC_N);
-        tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_A | FPSR_CC_Z | FPSR_CC_N);
+        c->tcond = TCG_COND_NE;
         break;
     case 14: /* Not Equal !Z */
     case 30: /* Signaling Not Equal !Z */
-        tmp = tcg_temp_new();
-        tcg_gen_andi_i32(tmp, fpsr, FPSR_CC_Z);
-        tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, l1);
+        c->v1 = tcg_temp_new();
+        c->g1 = 0;
+        tcg_gen_andi_i32(c->v1, fpsr, FPSR_CC_Z);
+        c->tcond = TCG_COND_EQ;
         break;
     case 15: /* True */
     case 31: /* Signaling True */
-        tcg_gen_br(l1);
+        c->v1 = c->v2;
+        c->tcond = TCG_COND_ALWAYS;
         break;
     }
     tcg_temp_free(fpsr);
+}
+
+static void gen_fjmpcc(DisasContext *s, int cond, TCGLabel *l1)
+{
+    DisasCompare c;
+
+    gen_fcc_cond(&c, s, cond);
+    tcg_gen_brcond_i32(c.tcond, c.v1, c.v2, l1);
+    free_cond(&c);
+}
+
+DISAS_INSN(fbcc)
+{
+    uint32_t offset;
+    uint32_t base;
+    TCGLabel *l1;
+
+    base = s->pc;
+    offset = (int16_t)read_im16(env, s);
+    if (insn & (1 << 6)) {
+        offset = (offset << 16) | read_im16(env, s);
+    }
+
+    l1 = gen_new_label();
+    update_cc_op(s);
+    gen_fjmpcc(s, insn & 0x3f, l1);
     gen_jmp_tb(s, 0, s->pc);
     gen_set_label(l1);
-    gen_jmp_tb(s, 1, addr + offset);
+    gen_jmp_tb(s, 1, base + offset);
+}
+
+DISAS_INSN(fscc)
+{
+    DisasCompare c;
+    int cond;
+    TCGv tmp;
+    uint16_t ext;
+
+    ext = read_im16(env, s);
+    cond = ext & 0x3f;
+    gen_fcc_cond(&c, s, cond);
+
+    tmp = tcg_temp_new();
+    tcg_gen_setcond_i32(c.tcond, tmp, c.v1, c.v2);
+    free_cond(&c);
+
+    tcg_gen_neg_i32(tmp, tmp);
+    DEST_EA(env, insn, OS_BYTE, tmp, NULL);
+    tcg_temp_free(tmp);
 }
 
 DISAS_INSN(frestore)
@@ -5349,6 +5401,7 @@  void register_m68k_insns (CPUM68KState *env)
     INSN(frestore,  f340, ffc0, CF_FPU);
     INSN(fsave,     f300, ffc0, CF_FPU);
     INSN(fpu,       f200, ffc0, FPU);
+    INSN(fscc,      f240, ffc0, FPU);
     INSN(fbcc,      f280, ff80, FPU);
     INSN(frestore,  f340, ffc0, FPU);
     INSN(fsave,     f300, ffc0, FPU);