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[RFC,19/28] target-xtensa: implement RST2 group (32 bit mul/div/rem)

Message ID 1304470768-16924-19-git-send-email-jcmvbkbc@gmail.com
State New
Headers show

Commit Message

Max Filippov May 4, 2011, 12:59 a.m. UTC 
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 target-xtensa/translate.c |   60 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 59 insertions(+), 1 deletions(-)

Comments

Blue Swirl May 4, 2011, 7:36 p.m. UTC | #1 
On Wed, May 4, 2011 at 3:59 AM, Max Filippov <jcmvbkbc@gmail.com> wrote:
> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
> ---
>  target-xtensa/translate.c |   60 ++++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 59 insertions(+), 1 deletions(-)
>
> diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
> index faf1adc..d635229 100644
> --- a/target-xtensa/translate.c
> +++ b/target-xtensa/translate.c
> @@ -793,7 +793,65 @@ static void disas_xtensa_insn(DisasContext *dc)
>             break;
>
>         case 2: /*RST2*/
> -            TBD();
> +            if (_OP2 >= 12) {
> +                HAS_OPTION(XTENSA_OPTION_32_BIT_IDIV);
> +                int label = gen_new_label();
> +                tcg_gen_brcondi_i32(TCG_COND_NE, cpu_R[RRR_T], 0, label);
> +                gen_exception_cause(dc, INTEGER_DIVIE_BY_ZERO_CAUSE);

DIVIE?
Max Filippov May 5, 2011, 8:27 a.m. UTC | #2 
>>         case 2: /*RST2*/
>> -            TBD();
>> +            if (_OP2 >= 12) {
>> +                HAS_OPTION(XTENSA_OPTION_32_BIT_IDIV);
>> +                int label = gen_new_label();
>> +                tcg_gen_brcondi_i32(TCG_COND_NE, cpu_R[RRR_T], 0, label);
>> +                gen_exception_cause(dc, INTEGER_DIVIE_BY_ZERO_CAUSE);
>
> DIVIE?

Oops (: Looks like I overuse ^n.

Thanks.
-- Max
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Patch

diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index faf1adc..d635229 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -793,7 +793,65 @@  static void disas_xtensa_insn(DisasContext *dc)
             break;
 
         case 2: /*RST2*/
-            TBD();
+            if (_OP2 >= 12) {
+                HAS_OPTION(XTENSA_OPTION_32_BIT_IDIV);
+                int label = gen_new_label();
+                tcg_gen_brcondi_i32(TCG_COND_NE, cpu_R[RRR_T], 0, label);
+                gen_exception_cause(dc, INTEGER_DIVIE_BY_ZERO_CAUSE);
+                gen_set_label(label);
+            }
+
+            switch (_OP2) {
+            case 8: /*MULLi*/
+                HAS_OPTION(XTENSA_OPTION_32_BIT_IMUL);
+                tcg_gen_mul_i32(cpu_R[RRR_R], cpu_R[RRR_S], cpu_R[RRR_T]);
+                break;
+
+            case 10: /*MULUHi*/
+            case 11: /*MULSHi*/
+                HAS_OPTION(XTENSA_OPTION_32_BIT_IMUL);
+                {
+                    TCGv_i64 r = tcg_temp_new_i64();
+                    TCGv_i64 s = tcg_temp_new_i64();
+                    TCGv_i64 t = tcg_temp_new_i64();
+
+                    if (_OP2 == 10) {
+                        tcg_gen_extu_i32_i64(s, cpu_R[RRR_S]);
+                        tcg_gen_extu_i32_i64(t, cpu_R[RRR_T]);
+                    } else {
+                        tcg_gen_ext_i32_i64(s, cpu_R[RRR_S]);
+                        tcg_gen_ext_i32_i64(t, cpu_R[RRR_T]);
+                    }
+                    tcg_gen_mul_i64(r, s, t);
+                    tcg_gen_shri_i64(r, r, 32);
+                    tcg_gen_trunc_i64_i32(cpu_R[RRR_R], r);
+
+                    tcg_temp_free_i64(r);
+                    tcg_temp_free_i64(s);
+                    tcg_temp_free_i64(t);
+                }
+                break;
+
+            case 12: /*QUOUi*/
+                tcg_gen_divu_i32(cpu_R[RRR_R], cpu_R[RRR_S], cpu_R[RRR_T]);
+                break;
+
+            case 13: /*QUOSi*/
+                tcg_gen_div_i32(cpu_R[RRR_R], cpu_R[RRR_S], cpu_R[RRR_T]);
+                break;
+
+            case 14: /*REMUi*/
+                tcg_gen_remu_i32(cpu_R[RRR_R], cpu_R[RRR_S], cpu_R[RRR_T]);
+                break;
+
+            case 15: /*REMSi*/
+                tcg_gen_rem_i32(cpu_R[RRR_R], cpu_R[RRR_S], cpu_R[RRR_T]);
+                break;
+
+            default: /*reserved*/
+                RESERVED();
+                break;
+            }
             break;
 
         case 3: /*RST3*/