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Re: [Qemu-devel] [PATCH v4] tcg-i386: Introduce limited deposit support
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH v4] tcg-i386: Introduce limited deposit support |
Date: |
Thu, 29 Sep 2011 12:50:06 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2 |
On 09/29/2011 09:52 AM, Jan Kiszka wrote:
> x86 cannot provide an optimized generic deposit implementation. But at
> least for a few special cases, namely for writing bits 0..7, 8..15, and
> 0..15, versions using only a single instruction are feasible.
> Introducing such limited support improves emulating 16-bit x86 code on
> x86, but also rarer cases where 32-bit or 64-bit code accesses bytes or
> words.
>
> Signed-off-by: Jan Kiszka <address@hidden>
> ---
>
> Changes in v4:
> - provide correct default TCG_TARGET_deposit_i32_valid
>
> Changes in v3:
> - provide default TCG_TARGET_deposit_i32_valid - just in case
>
> Changes in v2:
> - introduce restricting predicates TCG_TARGET_deposit_i32/64_valid
> to decide if deposit support can be used
> - express register constraints via new 'Q' symbol
>
> tcg/i386/tcg-target.c | 24 ++++++++++++++++++++++++
> tcg/i386/tcg-target.h | 9 +++++++--
> tcg/tcg-op.h | 4 ++--
> tcg/tcg.h | 7 +++++++
> 4 files changed, 40 insertions(+), 4 deletions(-)
Reviewed-by: Richard Henderson <address@hidden>
r~
- Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers, (continued)
- Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers, Jan Kiszka, 2011/09/28
- Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers, Richard Henderson, 2011/09/28
- Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers, Jan Kiszka, 2011/09/28
- Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers, Richard Henderson, 2011/09/28
- [Qemu-devel] [PATCH v2] tcg-i386: Introduce limited deposit support, Jan Kiszka, 2011/09/29
- Re: [Qemu-devel] [PATCH v2] tcg-i386: Introduce limited deposit support, Richard Henderson, 2011/09/29
- Re: [Qemu-devel] [PATCH v2] tcg-i386: Introduce limited deposit support, Jan Kiszka, 2011/09/29
- [Qemu-devel] [PATCH v3] tcg-i386: Introduce limited deposit support, Jan Kiszka, 2011/09/29
- Re: [Qemu-devel] [PATCH v3] tcg-i386: Introduce limited deposit support, Richard Henderson, 2011/09/29
- [Qemu-devel] [PATCH v4] tcg-i386: Introduce limited deposit support, Jan Kiszka, 2011/09/29
- Re: [Qemu-devel] [PATCH v4] tcg-i386: Introduce limited deposit support,
Richard Henderson <=