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Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH] tcg-i386: Introduce specific deposit helpers
Date: Wed, 28 Sep 2011 15:47:19 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/28/2011 03:07 PM, Jan Kiszka wrote:
> On 2011-09-28 17:19, Richard Henderson wrote:
>> On 09/28/2011 07:33 AM, Jan Kiszka wrote:
>>>> I don't particularly care for the 3 different opcodes.  Perhaps
>>>> we'd be better off with an inline predicate for when the deposit
>>>> opcode is "valid"?
>>> We still need to dispatch at tcg generation time which variant is valid. Or 
>>> what do you have in mind?
>> Yes, but we'd know at tcg generation time that it *does* fit one of
>> the few patterns you point out.
>> The predicate would be used in e.g. tcg_gen_deposit_i32 to select
>> either INDEX_op_deposit_i32 or the and/shift/and/or fallback.
> I think I'm slowly starting to understand:
> #define TCG_TARGET_HAS_deposit_i32(ofs, len) \
>     (((ofs) == 0 && (len) == 8 && TCG_TARGET_HAS_deposit8l_i32) || \
>      ...)
> defined by the i386 tcg target, right?

Something like that.  Except without the TCG_TARGET_HAS_deposit8l_i32.


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