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Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation.
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation. |
Date: |
Wed, 26 Jan 2011 11:05:54 -0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Thunderbird/3.1.7 |
On 01/26/2011 11:01 AM, Alexander Graf wrote:
>> As far as I know, it does not happen at random. Which seems to be
>> what you are suggesting.
>
> It happens on load/store and potentially helpers. The main difference
> IIUC between globals and temps is that globals are kept in registers as
> long as possible (read: until load/store or helper or tb end gets
> emitted) while temporaries are not stored back to any memory, so they
> are lost on load/store.
>
> So what you are suggesting is basically to use a different set of
> globals for regs32 and to keep track of their usage throughout the TB,
> so we can convert on demand. We can't use temporaries for that unless we
> manually store them off on load/store/helper/tb end which means we'd
> rewrite the globals treatment in target code :).
No, what I'm suggesting is manually storing the reg32 temporaries back
to their reg64 origins in the translator immediately before issuing the
load/store/helper/tbend, at which point the generic TCG bits write back
the reg64 globals to their env origin.
Do you have a pointer to your s390x tree?
r~
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., (continued)
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Richard Henderson, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Avi Kivity, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Richard Henderson, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Richard Henderson, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Richard Henderson, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation.,
Richard Henderson <=
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Richard Henderson, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Alexander Graf, 2011/01/26
- Re: [Qemu-devel] [PATCH 5/7] tcg-i386: Implement deposit operation., Aurelien Jarno, 2011/01/31
Re: [Qemu-devel] [PATCH 0/7] Define "deposit" tcg operation, v2, Aurelien Jarno, 2011/01/11
Re: [Qemu-devel] [PATCH 0/7] Define "deposit" tcg operation, v2, Edgar E. Iglesias, 2011/01/20