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* Re: [PATCH v2 1/1] target/riscv: Add Zihintpause support
       [not found] ` <20220524203647.31435-2-daolu@rivosinc.com>
@ 2022-06-07 21:17   ` Dao Lu
  2022-06-07 23:03     ` Alistair Francis
  0 siblings, 1 reply; 4+ messages in thread
From: Dao Lu @ 2022-06-07 21:17 UTC (permalink / raw)
  To: qemu-devel
  Cc: Palmer Dabbelt, Alistair Francis, Bin Meng,
	open list:RISC-V TCG CPUs, Heiko Stuebner

Ping

On Tue, May 24, 2022 at 1:36 PM Dao Lu <daolu@rivosinc.com> wrote:
>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> Signed-off-by: Dao Lu <daolu@rivosinc.com>
> ---
>  target/riscv/cpu.c                      |  2 ++
>  target/riscv/cpu.h                      |  1 +
>  target/riscv/insn32.decode              |  7 ++++++-
>  target/riscv/insn_trans/trans_rvi.c.inc | 18 ++++++++++++++++++
>  4 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index ccacdee215..183fb37fdf 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -825,6 +825,7 @@ static Property riscv_cpu_properties[] = {
>      DEFINE_PROP_BOOL("Counters", RISCVCPU, cfg.ext_counters, true),
>      DEFINE_PROP_BOOL("Zifencei", RISCVCPU, cfg.ext_ifencei, true),
>      DEFINE_PROP_BOOL("Zicsr", RISCVCPU, cfg.ext_icsr, true),
> +    DEFINE_PROP_BOOL("Zihintpause", RISCVCPU, cfg.ext_zihintpause, true),
>      DEFINE_PROP_BOOL("Zfh", RISCVCPU, cfg.ext_zfh, false),
>      DEFINE_PROP_BOOL("Zfhmin", RISCVCPU, cfg.ext_zfhmin, false),
>      DEFINE_PROP_BOOL("Zve32f", RISCVCPU, cfg.ext_zve32f, false),
> @@ -996,6 +997,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
>       *    extensions by an underscore.
>       */
>      struct isa_ext_data isa_edata_arr[] = {
> +        ISA_EDATA_ENTRY(zihintpause, ext_zihintpause),
>          ISA_EDATA_ENTRY(zfh, ext_zfh),
>          ISA_EDATA_ENTRY(zfhmin, ext_zfhmin),
>          ISA_EDATA_ENTRY(zfinx, ext_zfinx),
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index fe6c9a2c92..e466a04a59 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -394,6 +394,7 @@ struct RISCVCPUConfig {
>      bool ext_counters;
>      bool ext_ifencei;
>      bool ext_icsr;
> +    bool ext_zihintpause;
>      bool ext_svinval;
>      bool ext_svnapot;
>      bool ext_svpbmt;
> diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
> index 4033565393..595fdcdad8 100644
> --- a/target/riscv/insn32.decode
> +++ b/target/riscv/insn32.decode
> @@ -149,7 +149,12 @@ srl      0000000 .....    ..... 101 ..... 0110011 @r
>  sra      0100000 .....    ..... 101 ..... 0110011 @r
>  or       0000000 .....    ..... 110 ..... 0110011 @r
>  and      0000000 .....    ..... 111 ..... 0110011 @r
> -fence    ---- pred:4 succ:4 ----- 000 ----- 0001111
> +
> +{
> +  pause  0000 0001   0000   00000 000 00000 0001111
> +  fence  ---- pred:4 succ:4 ----- 000 ----- 0001111
> +}
> +
>  fence_i  ---- ----   ----   ----- 001 ----- 0001111
>  csrrw    ............     ..... 001 ..... 1110011 @csr
>  csrrs    ............     ..... 010 ..... 1110011 @csr
> diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc
> index f1342f30f8..ca75e05f4b 100644
> --- a/target/riscv/insn_trans/trans_rvi.c.inc
> +++ b/target/riscv/insn_trans/trans_rvi.c.inc
> @@ -796,6 +796,24 @@ static bool trans_srad(DisasContext *ctx, arg_srad *a)
>      return gen_shift(ctx, a, EXT_SIGN, tcg_gen_sar_tl, NULL);
>  }
>
> +static bool trans_pause(DisasContext *ctx, arg_pause *a)
> +{
> +    if (!ctx->cfg_ptr->ext_zihintpause) {
> +        return false;
> +    }
> +
> +    /*
> +     * PAUSE is a no-op in QEMU,
> +     * however we need to clear the reservation,
> +     * end the TB and return to main loop
> +     */
> +    tcg_gen_movi_tl(load_res, -1);
> +    gen_set_pc_imm(ctx, ctx->pc_succ_insn);
> +    tcg_gen_exit_tb(NULL, 0);
> +    ctx->base.is_jmp = DISAS_NORETURN;
> +
> +    return true;
> +}
>
>  static bool trans_fence(DisasContext *ctx, arg_fence *a)
>  {
> --
> 2.30.1 (Apple Git-130)
>


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v2 1/1] target/riscv: Add Zihintpause support
  2022-06-07 21:17   ` [PATCH v2 1/1] target/riscv: Add Zihintpause support Dao Lu
@ 2022-06-07 23:03     ` Alistair Francis
  2022-06-07 23:20       ` Dao Lu
  0 siblings, 1 reply; 4+ messages in thread
From: Alistair Francis @ 2022-06-07 23:03 UTC (permalink / raw)
  To: Dao Lu
  Cc: qemu-devel@nongnu.org Developers, Palmer Dabbelt,
	Alistair Francis, Bin Meng, open list:RISC-V TCG CPUs,
	Heiko Stuebner

On Wed, Jun 8, 2022 at 8:59 AM Dao Lu <daolu@rivosinc.com> wrote:
>
> Ping

The latest version of this patch on the mailing list has comments that
need to be addressed

Alistair

>
> On Tue, May 24, 2022 at 1:36 PM Dao Lu <daolu@rivosinc.com> wrote:
> >
> > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > Signed-off-by: Dao Lu <daolu@rivosinc.com>
> > ---
> >  target/riscv/cpu.c                      |  2 ++
> >  target/riscv/cpu.h                      |  1 +
> >  target/riscv/insn32.decode              |  7 ++++++-
> >  target/riscv/insn_trans/trans_rvi.c.inc | 18 ++++++++++++++++++
> >  4 files changed, 27 insertions(+), 1 deletion(-)
> >
> > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> > index ccacdee215..183fb37fdf 100644
> > --- a/target/riscv/cpu.c
> > +++ b/target/riscv/cpu.c
> > @@ -825,6 +825,7 @@ static Property riscv_cpu_properties[] = {
> >      DEFINE_PROP_BOOL("Counters", RISCVCPU, cfg.ext_counters, true),
> >      DEFINE_PROP_BOOL("Zifencei", RISCVCPU, cfg.ext_ifencei, true),
> >      DEFINE_PROP_BOOL("Zicsr", RISCVCPU, cfg.ext_icsr, true),
> > +    DEFINE_PROP_BOOL("Zihintpause", RISCVCPU, cfg.ext_zihintpause, true),
> >      DEFINE_PROP_BOOL("Zfh", RISCVCPU, cfg.ext_zfh, false),
> >      DEFINE_PROP_BOOL("Zfhmin", RISCVCPU, cfg.ext_zfhmin, false),
> >      DEFINE_PROP_BOOL("Zve32f", RISCVCPU, cfg.ext_zve32f, false),
> > @@ -996,6 +997,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
> >       *    extensions by an underscore.
> >       */
> >      struct isa_ext_data isa_edata_arr[] = {
> > +        ISA_EDATA_ENTRY(zihintpause, ext_zihintpause),
> >          ISA_EDATA_ENTRY(zfh, ext_zfh),
> >          ISA_EDATA_ENTRY(zfhmin, ext_zfhmin),
> >          ISA_EDATA_ENTRY(zfinx, ext_zfinx),
> > diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> > index fe6c9a2c92..e466a04a59 100644
> > --- a/target/riscv/cpu.h
> > +++ b/target/riscv/cpu.h
> > @@ -394,6 +394,7 @@ struct RISCVCPUConfig {
> >      bool ext_counters;
> >      bool ext_ifencei;
> >      bool ext_icsr;
> > +    bool ext_zihintpause;
> >      bool ext_svinval;
> >      bool ext_svnapot;
> >      bool ext_svpbmt;
> > diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
> > index 4033565393..595fdcdad8 100644
> > --- a/target/riscv/insn32.decode
> > +++ b/target/riscv/insn32.decode
> > @@ -149,7 +149,12 @@ srl      0000000 .....    ..... 101 ..... 0110011 @r
> >  sra      0100000 .....    ..... 101 ..... 0110011 @r
> >  or       0000000 .....    ..... 110 ..... 0110011 @r
> >  and      0000000 .....    ..... 111 ..... 0110011 @r
> > -fence    ---- pred:4 succ:4 ----- 000 ----- 0001111
> > +
> > +{
> > +  pause  0000 0001   0000   00000 000 00000 0001111
> > +  fence  ---- pred:4 succ:4 ----- 000 ----- 0001111
> > +}
> > +
> >  fence_i  ---- ----   ----   ----- 001 ----- 0001111
> >  csrrw    ............     ..... 001 ..... 1110011 @csr
> >  csrrs    ............     ..... 010 ..... 1110011 @csr
> > diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc
> > index f1342f30f8..ca75e05f4b 100644
> > --- a/target/riscv/insn_trans/trans_rvi.c.inc
> > +++ b/target/riscv/insn_trans/trans_rvi.c.inc
> > @@ -796,6 +796,24 @@ static bool trans_srad(DisasContext *ctx, arg_srad *a)
> >      return gen_shift(ctx, a, EXT_SIGN, tcg_gen_sar_tl, NULL);
> >  }
> >
> > +static bool trans_pause(DisasContext *ctx, arg_pause *a)
> > +{
> > +    if (!ctx->cfg_ptr->ext_zihintpause) {
> > +        return false;
> > +    }
> > +
> > +    /*
> > +     * PAUSE is a no-op in QEMU,
> > +     * however we need to clear the reservation,
> > +     * end the TB and return to main loop
> > +     */
> > +    tcg_gen_movi_tl(load_res, -1);
> > +    gen_set_pc_imm(ctx, ctx->pc_succ_insn);
> > +    tcg_gen_exit_tb(NULL, 0);
> > +    ctx->base.is_jmp = DISAS_NORETURN;
> > +
> > +    return true;
> > +}
> >
> >  static bool trans_fence(DisasContext *ctx, arg_fence *a)
> >  {
> > --
> > 2.30.1 (Apple Git-130)
> >
>


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v2 1/1] target/riscv: Add Zihintpause support
  2022-06-07 23:03     ` Alistair Francis
@ 2022-06-07 23:20       ` Dao Lu
  2022-06-08  0:03         ` Alistair Francis
  0 siblings, 1 reply; 4+ messages in thread
From: Dao Lu @ 2022-06-07 23:20 UTC (permalink / raw)
  To: Alistair Francis
  Cc: qemu-devel@nongnu.org Developers, Palmer Dabbelt,
	Alistair Francis, Bin Meng, open list:RISC-V TCG CPUs,
	Heiko Stuebner

Hi Alistair,

Thanks for the response. I don't think I can find any comments
on this patch though, could you help point me to them?

Thanks,
Dao

On Tue, Jun 7, 2022 at 4:04 PM Alistair Francis <alistair23@gmail.com> wrote:
>
> On Wed, Jun 8, 2022 at 8:59 AM Dao Lu <daolu@rivosinc.com> wrote:
> >
> > Ping
>
> The latest version of this patch on the mailing list has comments that
> need to be addressed
>
> Alistair
>
> >
> > On Tue, May 24, 2022 at 1:36 PM Dao Lu <daolu@rivosinc.com> wrote:
> > >
> > > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > > Signed-off-by: Dao Lu <daolu@rivosinc.com>
> > > ---
> > >  target/riscv/cpu.c                      |  2 ++
> > >  target/riscv/cpu.h                      |  1 +
> > >  target/riscv/insn32.decode              |  7 ++++++-
> > >  target/riscv/insn_trans/trans_rvi.c.inc | 18 ++++++++++++++++++
> > >  4 files changed, 27 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> > > index ccacdee215..183fb37fdf 100644
> > > --- a/target/riscv/cpu.c
> > > +++ b/target/riscv/cpu.c
> > > @@ -825,6 +825,7 @@ static Property riscv_cpu_properties[] = {
> > >      DEFINE_PROP_BOOL("Counters", RISCVCPU, cfg.ext_counters, true),
> > >      DEFINE_PROP_BOOL("Zifencei", RISCVCPU, cfg.ext_ifencei, true),
> > >      DEFINE_PROP_BOOL("Zicsr", RISCVCPU, cfg.ext_icsr, true),
> > > +    DEFINE_PROP_BOOL("Zihintpause", RISCVCPU, cfg.ext_zihintpause, true),
> > >      DEFINE_PROP_BOOL("Zfh", RISCVCPU, cfg.ext_zfh, false),
> > >      DEFINE_PROP_BOOL("Zfhmin", RISCVCPU, cfg.ext_zfhmin, false),
> > >      DEFINE_PROP_BOOL("Zve32f", RISCVCPU, cfg.ext_zve32f, false),
> > > @@ -996,6 +997,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
> > >       *    extensions by an underscore.
> > >       */
> > >      struct isa_ext_data isa_edata_arr[] = {
> > > +        ISA_EDATA_ENTRY(zihintpause, ext_zihintpause),
> > >          ISA_EDATA_ENTRY(zfh, ext_zfh),
> > >          ISA_EDATA_ENTRY(zfhmin, ext_zfhmin),
> > >          ISA_EDATA_ENTRY(zfinx, ext_zfinx),
> > > diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> > > index fe6c9a2c92..e466a04a59 100644
> > > --- a/target/riscv/cpu.h
> > > +++ b/target/riscv/cpu.h
> > > @@ -394,6 +394,7 @@ struct RISCVCPUConfig {
> > >      bool ext_counters;
> > >      bool ext_ifencei;
> > >      bool ext_icsr;
> > > +    bool ext_zihintpause;
> > >      bool ext_svinval;
> > >      bool ext_svnapot;
> > >      bool ext_svpbmt;
> > > diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
> > > index 4033565393..595fdcdad8 100644
> > > --- a/target/riscv/insn32.decode
> > > +++ b/target/riscv/insn32.decode
> > > @@ -149,7 +149,12 @@ srl      0000000 .....    ..... 101 ..... 0110011 @r
> > >  sra      0100000 .....    ..... 101 ..... 0110011 @r
> > >  or       0000000 .....    ..... 110 ..... 0110011 @r
> > >  and      0000000 .....    ..... 111 ..... 0110011 @r
> > > -fence    ---- pred:4 succ:4 ----- 000 ----- 0001111
> > > +
> > > +{
> > > +  pause  0000 0001   0000   00000 000 00000 0001111
> > > +  fence  ---- pred:4 succ:4 ----- 000 ----- 0001111
> > > +}
> > > +
> > >  fence_i  ---- ----   ----   ----- 001 ----- 0001111
> > >  csrrw    ............     ..... 001 ..... 1110011 @csr
> > >  csrrs    ............     ..... 010 ..... 1110011 @csr
> > > diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc
> > > index f1342f30f8..ca75e05f4b 100644
> > > --- a/target/riscv/insn_trans/trans_rvi.c.inc
> > > +++ b/target/riscv/insn_trans/trans_rvi.c.inc
> > > @@ -796,6 +796,24 @@ static bool trans_srad(DisasContext *ctx, arg_srad *a)
> > >      return gen_shift(ctx, a, EXT_SIGN, tcg_gen_sar_tl, NULL);
> > >  }
> > >
> > > +static bool trans_pause(DisasContext *ctx, arg_pause *a)
> > > +{
> > > +    if (!ctx->cfg_ptr->ext_zihintpause) {
> > > +        return false;
> > > +    }
> > > +
> > > +    /*
> > > +     * PAUSE is a no-op in QEMU,
> > > +     * however we need to clear the reservation,
> > > +     * end the TB and return to main loop
> > > +     */
> > > +    tcg_gen_movi_tl(load_res, -1);
> > > +    gen_set_pc_imm(ctx, ctx->pc_succ_insn);
> > > +    tcg_gen_exit_tb(NULL, 0);
> > > +    ctx->base.is_jmp = DISAS_NORETURN;
> > > +
> > > +    return true;
> > > +}
> > >
> > >  static bool trans_fence(DisasContext *ctx, arg_fence *a)
> > >  {
> > > --
> > > 2.30.1 (Apple Git-130)
> > >
> >


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v2 1/1] target/riscv: Add Zihintpause support
  2022-06-07 23:20       ` Dao Lu
@ 2022-06-08  0:03         ` Alistair Francis
  0 siblings, 0 replies; 4+ messages in thread
From: Alistair Francis @ 2022-06-08  0:03 UTC (permalink / raw)
  To: Dao Lu
  Cc: qemu-devel@nongnu.org Developers, Palmer Dabbelt,
	Alistair Francis, Bin Meng, open list:RISC-V TCG CPUs,
	Heiko Stuebner

On Wed, Jun 8, 2022 at 9:20 AM Dao Lu <daolu@rivosinc.com> wrote:
>
> Hi Alistair,
>
> Thanks for the response. I don't think I can find any comments
> on this patch though, could you help point me to them?

I see a PATCH v1 with comments and then your ping to PATCH v2, but I
don't see the original PATCH v2. It might not have made it to the
list, or maybe I just can't find it. Maybe send a v3 and we can go
from there

Alistair

>
> Thanks,
> Dao
>
> On Tue, Jun 7, 2022 at 4:04 PM Alistair Francis <alistair23@gmail.com> wrote:
> >
> > On Wed, Jun 8, 2022 at 8:59 AM Dao Lu <daolu@rivosinc.com> wrote:
> > >
> > > Ping
> >
> > The latest version of this patch on the mailing list has comments that
> > need to be addressed
> >
> > Alistair
> >
> > >
> > > On Tue, May 24, 2022 at 1:36 PM Dao Lu <daolu@rivosinc.com> wrote:
> > > >
> > > > Tested-by: Heiko Stuebner <heiko@sntech.de>
> > > > Signed-off-by: Dao Lu <daolu@rivosinc.com>
> > > > ---
> > > >  target/riscv/cpu.c                      |  2 ++
> > > >  target/riscv/cpu.h                      |  1 +
> > > >  target/riscv/insn32.decode              |  7 ++++++-
> > > >  target/riscv/insn_trans/trans_rvi.c.inc | 18 ++++++++++++++++++
> > > >  4 files changed, 27 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> > > > index ccacdee215..183fb37fdf 100644
> > > > --- a/target/riscv/cpu.c
> > > > +++ b/target/riscv/cpu.c
> > > > @@ -825,6 +825,7 @@ static Property riscv_cpu_properties[] = {
> > > >      DEFINE_PROP_BOOL("Counters", RISCVCPU, cfg.ext_counters, true),
> > > >      DEFINE_PROP_BOOL("Zifencei", RISCVCPU, cfg.ext_ifencei, true),
> > > >      DEFINE_PROP_BOOL("Zicsr", RISCVCPU, cfg.ext_icsr, true),
> > > > +    DEFINE_PROP_BOOL("Zihintpause", RISCVCPU, cfg.ext_zihintpause, true),
> > > >      DEFINE_PROP_BOOL("Zfh", RISCVCPU, cfg.ext_zfh, false),
> > > >      DEFINE_PROP_BOOL("Zfhmin", RISCVCPU, cfg.ext_zfhmin, false),
> > > >      DEFINE_PROP_BOOL("Zve32f", RISCVCPU, cfg.ext_zve32f, false),
> > > > @@ -996,6 +997,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
> > > >       *    extensions by an underscore.
> > > >       */
> > > >      struct isa_ext_data isa_edata_arr[] = {
> > > > +        ISA_EDATA_ENTRY(zihintpause, ext_zihintpause),
> > > >          ISA_EDATA_ENTRY(zfh, ext_zfh),
> > > >          ISA_EDATA_ENTRY(zfhmin, ext_zfhmin),
> > > >          ISA_EDATA_ENTRY(zfinx, ext_zfinx),
> > > > diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> > > > index fe6c9a2c92..e466a04a59 100644
> > > > --- a/target/riscv/cpu.h
> > > > +++ b/target/riscv/cpu.h
> > > > @@ -394,6 +394,7 @@ struct RISCVCPUConfig {
> > > >      bool ext_counters;
> > > >      bool ext_ifencei;
> > > >      bool ext_icsr;
> > > > +    bool ext_zihintpause;
> > > >      bool ext_svinval;
> > > >      bool ext_svnapot;
> > > >      bool ext_svpbmt;
> > > > diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
> > > > index 4033565393..595fdcdad8 100644
> > > > --- a/target/riscv/insn32.decode
> > > > +++ b/target/riscv/insn32.decode
> > > > @@ -149,7 +149,12 @@ srl      0000000 .....    ..... 101 ..... 0110011 @r
> > > >  sra      0100000 .....    ..... 101 ..... 0110011 @r
> > > >  or       0000000 .....    ..... 110 ..... 0110011 @r
> > > >  and      0000000 .....    ..... 111 ..... 0110011 @r
> > > > -fence    ---- pred:4 succ:4 ----- 000 ----- 0001111
> > > > +
> > > > +{
> > > > +  pause  0000 0001   0000   00000 000 00000 0001111
> > > > +  fence  ---- pred:4 succ:4 ----- 000 ----- 0001111
> > > > +}
> > > > +
> > > >  fence_i  ---- ----   ----   ----- 001 ----- 0001111
> > > >  csrrw    ............     ..... 001 ..... 1110011 @csr
> > > >  csrrs    ............     ..... 010 ..... 1110011 @csr
> > > > diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc
> > > > index f1342f30f8..ca75e05f4b 100644
> > > > --- a/target/riscv/insn_trans/trans_rvi.c.inc
> > > > +++ b/target/riscv/insn_trans/trans_rvi.c.inc
> > > > @@ -796,6 +796,24 @@ static bool trans_srad(DisasContext *ctx, arg_srad *a)
> > > >      return gen_shift(ctx, a, EXT_SIGN, tcg_gen_sar_tl, NULL);
> > > >  }
> > > >
> > > > +static bool trans_pause(DisasContext *ctx, arg_pause *a)
> > > > +{
> > > > +    if (!ctx->cfg_ptr->ext_zihintpause) {
> > > > +        return false;
> > > > +    }
> > > > +
> > > > +    /*
> > > > +     * PAUSE is a no-op in QEMU,
> > > > +     * however we need to clear the reservation,
> > > > +     * end the TB and return to main loop
> > > > +     */
> > > > +    tcg_gen_movi_tl(load_res, -1);
> > > > +    gen_set_pc_imm(ctx, ctx->pc_succ_insn);
> > > > +    tcg_gen_exit_tb(NULL, 0);
> > > > +    ctx->base.is_jmp = DISAS_NORETURN;
> > > > +
> > > > +    return true;
> > > > +}
> > > >
> > > >  static bool trans_fence(DisasContext *ctx, arg_fence *a)
> > > >  {
> > > > --
> > > > 2.30.1 (Apple Git-130)
> > > >
> > >


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2022-06-08  0:08 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2022-06-07 21:17   ` [PATCH v2 1/1] target/riscv: Add Zihintpause support Dao Lu
2022-06-07 23:03     ` Alistair Francis
2022-06-07 23:20       ` Dao Lu
2022-06-08  0:03         ` Alistair Francis

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