From: Richard Henderson <richard.henderson@linaro.org>
To: Song Gao <gaosong@loongson.cn>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, yangxiaojuan@loongson.cn,
david@redhat.com, bin.meng@windriver.com,
mark.cave-ayland@ilande.co.uk, aleksandar.rikalo@syrmia.com,
jcmvbkbc@gmail.com, tsimpson@quicinc.com,
alistair.francis@wdc.com, edgar.iglesias@gmail.com,
chenhuacai@gmail.com, philmd@redhat.com, atar4qemu@gmail.com,
thuth@redhat.com, ehabkost@redhat.com, groug@kaod.org,
maobibo@loongson.cn, mrolnik@gmail.com, shorne@gmail.com,
alex.bennee@linaro.org, david@gibson.dropbear.id.au,
kbastian@mail.uni-paderborn.de, crwulff@gmail.com,
laurent@vivier.eu, palmer@dabbelt.com, pbonzini@redhat.com,
aurelien@aurel32.net
Subject: Re: [PATCH v4 04/21] target/loongarch: Add fixed point arithmetic instruction translation
Date: Sat, 4 Sep 2021 13:04:24 +0200 [thread overview]
Message-ID: <0180cf32-a93c-191d-2e8e-2da9e27431eb@linaro.org> (raw)
In-Reply-To: <1630586467-22463-5-git-send-email-gaosong@loongson.cn>
On 9/2/21 2:40 PM, Song Gao wrote:
> +static bool gen_r2_si12(DisasContext *ctx, arg_fmt_rdrjsi12 *a,
> + DisasExtend src_ext, DisasExtend dst_ext,
> + void (*func)(TCGv, TCGv, TCGv))
> +{
> + ctx->dst_ext = dst_ext;
> + TCGv dest = gpr_dst(ctx, a->rd);
> + TCGv src1 = gpr_src(ctx, a->rj, src_ext);
> + TCGv src2 = tcg_constant_tl(a->si12);
Prefer to put declarations before statements, as per old C90 still.
> + func(dest, src1, src2);
> +
> + if (ctx->dst_ext) {
Given that func does not receive ctx, why store dst_ext into ctx and then read it back?
It seems like you should just use the parameter directly.
> +static bool gen_pc(DisasContext *ctx, arg_fmt_rdsi20 *a,
> + void (*func)(DisasContext *ctx, TCGv, target_long))
> +{
> + TCGv dest = gpr_dst(ctx, a->rd);
> +
> + func(ctx, dest, a->si20);
> + return true;
> +}
Perhaps clearer with:
target_long (*func)(target_long pc, target_long si20)
target_long addr = func(ctx->base.pc_next, a->si20);
TCGv dest = gpr_dst(ctx, a->rd);
tcg_gen_movi_tl(dest, addr);
return true;
> +static bool gen_mulh(DisasContext *ctx, arg_add_w *a,
> + void(*func)(TCGv_i32, TCGv_i32, TCGv_i32, TCGv_i32))
> +{
> + TCGv dest = gpr_dst(ctx, a->rd);
> + TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
> + TCGv src2 = gpr_src(ctx, a->rk, EXT_NONE);
> + TCGv_i32 discard = tcg_temp_new_i32();
> + TCGv_i32 t0 = tcg_temp_new_i32();
> + TCGv_i32 t1 = tcg_temp_new_i32();
> +
> + tcg_gen_trunc_tl_i32(t0, src1);
> + tcg_gen_trunc_tl_i32(t1, src2);
> + func(discard, t0, t0, t1);
> + tcg_gen_ext_i32_tl(dest, t0);
> +
> + tcg_temp_free_i32(discard);
> + tcg_temp_free_i32(t0);
> + tcg_temp_free_i32(t1);
> + return true;
> +}
You should be able to use gen_r3 for these.
static void gen_mulh_w(TCGv dest, TCGv src1, TCGv src2)
{
tcg_gen_mul_i64(dest, src1, src2);
tcg_gen_sari_i64(dest, dest, 32);
}
static void gen_mulh_wu(TCGv dest, TCGv src1, TCGv src2)
{
tcg_gen_mul_i64(dest, src1, src2);
tcg_gen_sari_i64(dest, dest, 32);
}
static void gen_mulh_d(TCGv dest, TCGv src1, TCGv src2)
{
TCGv discard = tcg_temp_new();
tcg_gen_muls2_tl(discard, dest, src1, src2);
tcg_temp_free(discard);
}
static void gen_mulh_du(TCGv dest, TCGv src1, TCGv src2)
{
TCGv discard = tcg_temp_new();
tcg_gen_mulu2_tl(discard, dest, src1, src2);
tcg_temp_free(discard);
}
TRANS(mulh_w, gen_r3, EXT_SIGN, EXT_SIGN, EXT_NONE, gen_mulh_w)
TRANS(mulh_wu, gen_r3, EXT_ZERO, EXT_ZERO, EXT_NONE, gen_mulh_wu)
TRANS(mulh_d, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_mulh_d)
TRANS(mulh_du, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_mulh_du)
> +static bool gen_mulw_d(DisasContext *ctx, arg_add_w *a,
> + void(*func)(TCGv_i64, TCGv))
> +{
> + TCGv dest = gpr_dst(ctx, a->rd);
> + TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
> + TCGv src2 = gpr_src(ctx, a->rk, EXT_NONE);
> +
> + func(src1, src1);
> + func(src2, src2);
> + tcg_gen_mul_i64(dest, src1, src2);
> + return true;
> +}
The func parameter here serves the same purpose as DisasExtend, so again you can use gen_r3:
TRANS(mulw_d_w, gen_r3, EXT_SIGN, EXT_SIGN, EXT_NONE, tcg_gen_mul_tl)
TRANS(mulw_d_wu, gen_r3, EXT_ZERO, EXT_ZERO, EXT_NONE, tcg_gen_mul_tl)
> +
> +static bool gen_div_w(DisasContext *ctx, arg_fmt_rdrjrk *a,
> + DisasExtend src_ext, DisasExtend dst_ext,
> + void(*func)(TCGv, TCGv, TCGv))
> +{
> + ctx->dst_ext = dst_ext;
> + TCGv dest = gpr_dst(ctx, a->rd);
> + TCGv src1 = gpr_src(ctx, a->rj, src_ext);
> + TCGv src2 = gpr_src(ctx, a->rk, src_ext);
> + TCGv t2 = tcg_temp_new();
> + TCGv t3 = tcg_temp_new();
> +
> + tcg_gen_setcondi_tl(TCG_COND_EQ, t2, src1, INT_MIN);
> + tcg_gen_setcondi_tl(TCG_COND_EQ, t3, src2, -1);
> + tcg_gen_and_tl(t2, t2, t3);
> + tcg_gen_setcondi_tl(TCG_COND_EQ, t3, src2, 0);
> + tcg_gen_or_tl(t2, t2, t3);
> + tcg_gen_movi_tl(t3, 0);
> + tcg_gen_movcond_tl(TCG_COND_NE, src2, t2, t3, t2, src2);
Bug, writing back to src2.
> + func(dest, src1, src2);
You can split this out differently so that you can use gen_r3.
static TCGv prep_divisor_d(TCGv src1, TCGv src2)
{
TCGv t0 = temp_new();
TCGv t1 = tcg_temp_new();
TCGv t2 = tcg_temp_new();
TCGv zero = tcg_constant_tl(0);
/*
* If min / -1, set the divisor to 1.
* This avoids potential host overflow trap and produces min.
* If x / 0, set the divisor to 1.
* This avoids potential host overflow trap;
* the required result is undefined.
*/
tcg_gen_setcondi_tl(TCG_COND_EQ, t0, src1, INT64_MIN);
tcg_gen_setcondi_tl(TCG_COND_EQ, t1, src2, -1);
tcg_gen_setcondi_tl(TCG_COND_EQ, t2, src2, 0);
tcg_gen_and_tl(t0, t0, t1);
tcg_gen_or_tl(t0, t0, t2);
tcg_gen_movcond_tl(TCG_COND_NE, t0, t0, zero, t0, src2);
tcg_temp_free(t1);
tcg_temp_free(t2);
return t0;
}
static TCGv prep_divisor_du(TCGv src2)
{
TCGv t0 = temp_new();
TCGv zero = tcg_constant_tl(0);
TCGv one = tcg_constant_tl(1);
/*
* If x / 0, set the divisor to 1.
* This avoids potential host overflow trap;
* the required result is undefined.
*/
tcg_gen_movcond_tl(TCG_COND_EQ, t0, src2, zero, one, src2);
return t0;
}
static void gen_div_d(TCGv dest, TCGv src1, TCGv src2)
{
src2 = prep_divisor_d(src1, src2);
tcg_gen_div_tl(dest, src1, src2);
}
static void gen_rem_d(TCGv dest, TCGv src1, TCGv src2)
{
src2 = prep_divisor_d(src1, src2);
tcg_gen_rem_tl(dest, src1, src2);
}
static void gen_div_du(TCGv dest, TCGv src1, TCGv src2)
{
src2 = prep_divisor_du(src2);
tcg_gen_divu_tl(dest, src1, src2);
}
static void gen_rem_du(TCGv dest, TCGv src1, TCGv src2)
{
src2 = prep_divisor_du(src2);
tcg_gen_remu_tl(dest, src1, src2);
}
static void gen_div_w(TCGv dest, TCGv src1, TCGv src2)
{
/* We need not check for integer overflow for div_w. */
src2 = prep_divisor_du(src2);
tcg_gen_div_tl(dest, src1, src2);
}
static void gen_rem_w(TCGv dest, TCGv src1, TCGv src2)
{
/* We need not check for integer overflow for rem_w. */
src2 = prep_divisor_du(src2);
tcg_gen_rem_tl(dest, src1, src2);
}
TRANS(div_w, gen_r3, EXT_SIGN, EXT_SIGN, EXT_SIGN, gen_div_w)
TRANS(mod_w, gen_r3, EXT_SIGN, EXT_SIGN, EXT_SIGN, gen_rem_w)
TRANS(div_wu, gen_r3, EXT_ZERO, EXT_ZERO, EXT_SIGN, gen_div_du)
TRANS(mod_wu, gen_r3, EXT_ZERO, EXT_ZERO, EXT_SIGN, gen_div_du)
TRANS(div_d, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_div_d)
TRANS(mod_d, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_rem_d)
TRANS(div_du, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_div_du)
TRANS(mod_du, gen_r3, EXT_NONE, EXT_NONE, EXT_NONE, gen_rem_du)
> --- a/target/loongarch/internals.h
> +++ b/target/loongarch/internals.h
> @@ -9,7 +9,6 @@
> #ifndef LOONGARCH_INTERNALS_H
> #define LOONGARCH_INTERNALS_H
>
> -
> void loongarch_translate_init(void);
>
> void loongarch_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
Fold this back to a previous patch.
> -static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
> -{
> - return true;
> -}
Yes indeed, fold this patch to a previous patch.
r~
next prev parent reply other threads:[~2021-09-04 11:06 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-02 12:40 [PATCH v4 00/21] Add LoongArch linux-user emulation support Song Gao
2021-09-02 12:40 ` [PATCH v4 01/21] target/loongarch: Add README Song Gao
2021-09-02 12:40 ` [PATCH v4 02/21] target/loongarch: Add core definition Song Gao
2021-09-04 9:44 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 03/21] target/loongarch: Add main translation routines Song Gao
2021-09-04 9:45 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 04/21] target/loongarch: Add fixed point arithmetic instruction translation Song Gao
2021-09-04 11:04 ` Richard Henderson [this message]
2021-09-07 12:36 ` Song Gao
2021-09-02 12:40 ` [PATCH v4 05/21] target/loongarch: Add fixed point shift " Song Gao
2021-09-04 11:17 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 06/21] target/loongarch: Add fixed point bit " Song Gao
2021-09-04 12:57 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 07/21] target/loongarch: Add fixed point load/store " Song Gao
2021-09-04 13:03 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 08/21] target/loongarch: Add fixed point atomic " Song Gao
2021-09-04 13:14 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 09/21] target/loongarch: Add fixed point extra " Song Gao
2021-09-05 8:39 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 10/21] target/loongarch: Add floating point arithmetic " Song Gao
2021-09-05 9:08 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 11/21] target/loongarch: Add floating point comparison " Song Gao
2021-09-05 9:24 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 12/21] target/loongarch: Add floating point conversion " Song Gao
2021-09-05 9:29 ` Richard Henderson
2021-09-02 12:40 ` [PATCH v4 13/21] target/loongarch: Add floating point move " Song Gao
2021-09-05 9:38 ` Richard Henderson
2021-09-05 9:45 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 14/21] target/loongarch: Add floating point load/store " Song Gao
2021-09-05 9:46 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 15/21] target/loongarch: Add branch " Song Gao
2021-09-05 9:49 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 16/21] target/loongarch: Add disassembler Song Gao
2021-09-02 12:41 ` [PATCH v4 17/21] LoongArch Linux User Emulation Song Gao
2021-09-05 10:04 ` Richard Henderson
2021-09-08 9:50 ` Song Gao
2021-09-10 12:52 ` Richard Henderson
2021-09-11 5:58 ` Song Gao
2021-09-12 12:38 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 18/21] default-configs: Add loongarch linux-user support Song Gao
2021-09-02 12:41 ` [PATCH v4 19/21] target/loongarch: Add target build suport Song Gao
2021-09-05 10:05 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 20/21] target/loongarch: 'make check-tcg' support Song Gao
2021-09-05 10:06 ` Richard Henderson
2021-09-02 12:41 ` [PATCH v4 21/21] scripts: add loongarch64 binfmt config Song Gao
2021-09-05 10:08 ` Richard Henderson
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