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Re: [PATCH 07/20] target/loongarch: Add fixed point arithmetic instructi
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH 07/20] target/loongarch: Add fixed point arithmetic instruction translation |
Date: |
Fri, 2 Jul 2021 10:51:35 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 |
On 7/2/21 10:15 AM, Song Gao wrote:
> On 07/02/2021 04:31 AM, Philippe Mathieu-Daudé wrote:
>> On 6/28/21 2:04 PM, Song Gao wrote:
>>> This patch implement fixed point arithemtic instruction translation.
>>>
>>> This includes:
>>> - ADD.{W/D}, SUB.{W/D}
>>> - ADDI.{W/D}, ADDU16ID
>>> - ALSL.{W[U]/D}
>>> - LU12I.W, LU32I.D LU52I.D
>>> - SLT[U], SLT[U]I
>>> - PCADDI, PCADDU12I, PCADDU18I, PCALAU12I
>>> - AND, OR, NOR, XOR, ANDN, ORN
>>> - MUL.{W/D}, MULH.{W[U]/D[U]}
>>> - MULW.D.W[U]
>>> - DIV.{W[U]/D[U]}, MOD.{W[U]/D[U]}
>>> - ANDI, ORI, XORI
>>>
>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>> ---
>>> target/loongarch/insns.decode | 89 ++++++++
>>> target/loongarch/instmap.h | 53 +++++
>>> target/loongarch/trans.inc.c | 367 +++++++++++++++++++++++++++++++++
>>> target/loongarch/translate.c | 458
>>> ++++++++++++++++++++++++++++++++++++++++++
>>> 4 files changed, 967 insertions(+)
>>> create mode 100644 target/loongarch/insns.decode
>>> create mode 100644 target/loongarch/instmap.h
>>> create mode 100644 target/loongarch/trans.inc.c
>> It seems you are missing what decodetree is for... You should inline
>> each opcode code from gen_loongarch_muldiv in the opcode handler.
>>
>> Don't take MIPS as an example =)
>>
> Hi, Philippe,
>
> I‘m not sure I understand right. Here is an example of my modification
>
> static bool trans_xxx(DisasContext *ctx, arg_mul_w *a)
> {
> gen_loongarch_muldiv(ctx, a->rd, a->rj, a->rk);
> return true;
> }
> ...
>
> static void gen_loongarch_muldiv(DisasContext *ctx, int rd,
> int rj, int rk)
> {
> TCGv t0, t1;
>
> if (rd == 0) {
> /* Treat as NOP. */
> return;
> }
>
> t0 = tcg_temp_new();
> t1 = tcg_temp_new();
>
> gen_load_gpr(t0, rj);
> gen_load_gpr(t1, rk);
>
> switch (ctx->opcode) {
> case xxx_opcode:
> /* translate xxx */
> ...
>
> }
>
> Is that right?
No. With decode"tree" you only have to implement the
decode"leaves". No need to pass 'uin32_t opcode' and
use 'switch (ctx->opcode) ...'. Example for LA_OPC_MUL_D:
static bool trans_mul_d(DisasContext *ctx, int rd, int rj, int rk)
{
TCGv t0, t1;
check_loongarch_64(ctx);
if (a->rd == 0) {
/* Treat as NOP. */
return true;
}
t0 = tcg_temp_new();
t1 = tcg_temp_new();
gen_load_gpr(t0, a->rj);
gen_load_gpr(t1, a->rk);
tcg_gen_mul_i64(cpu_gpr[a->rd], t0, t1);
tcg_temp_free(t0);
tcg_temp_free(t1);
return true;
}