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Re: [Qemu-ppc] [Qemu-devel] [PATCH v2 0/8] target/ppc: remove various en

From: Mark Cave-Ayland
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH v2 0/8] target/ppc: remove various endian hacks from int_helper.c
Date: Sun, 27 Jan 2019 08:23:19 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 26/01/2019 01:53, David Gibson wrote:

> On Mon, Jan 21, 2019 at 05:15:20AM +0000, Mark Cave-Ayland wrote:
>> On 20/01/2019 20:28, David Gibson wrote:
>>> On Fri, Jan 18, 2019 at 01:25:37PM +0000, Mark Cave-Ayland wrote:
>>>> On 02/01/2019 02:59, David Gibson wrote:
>>>>> On Fri, Dec 28, 2018 at 01:52:27PM +0000, Mark Cave-Ayland wrote:
>>>>>> >From working on the TCG vector operations patchset, it is apparent that 
>>>>>> >there
>>>>>> are a large number of endian-based hacks in int_helper.c which can be 
>>>>>> removed by
>>>>>> making use of the various Vsr* macros.
>>>>>> Patch 1 is simple enough, and implements the complete set of Vsr* macros 
>>>>>> for
>>>>>> both big endian and little endian hosts.
>>>>>> Patches 2 and 3 rework the vector merge and multiply algorithms so that 
>>>>>> they
>>>>>> no longer require the endian-dependent HI_IDX and LO_IDX macros.
>>>>>> Patches 4 and 5 then completely remove the HI_IDX/LO_IDX and EL_IDX 
>>>>>> macros by
>>>>>> replacing the element accesses with their equivalent Vsr* macro instead.
>>>>>> Patches 6 and 7 tidy up the VEXT_SIGNED macro and fix a potential shift 
>>>>>> bug
>>>>>> in the ROTRu32 and ROTRu64 macros pointed out by Richard during the 
>>>>>> review of
>>>>>> v1.
>>>>>> Finally patch 8 is an inspection-based removal of other 
>>>>>> hacks in int_helper.c, again replacing accesses with the relevant Vsr* 
>>>>>> macro
>>>>>> instead.
>>>>>> Note that there are still some endian hacks left in int_helper.c after 
>>>>>> this
>>>>>> patchset: in particular the delightfully evil VECTOR_FOR_INORDER_I macro 
>>>>>> still
>>>>>> remains in places where the index variable was used for purposes other 
>>>>>> than
>>>>>> accessing elements within the vector.
>>>>>> There were also some parts where additional conversion could be done, 
>>>>>> but I
>>>>>> wasn't confident enough to make the change without access to PPC64 test 
>>>>>> images
>>>>>> or real big-endian host hardware.
>>>>> Applied to ppc-for-4.0, thanks.
>>>> Just checking your ppc-for-4.0 branch on github, I can't see where this 
>>>> has been
>>>> applied? Is it queued in a local branch still?
>>> Yeah, probably.  I've pushed it out now.
>> Thanks David. I've just had another quick look, and whilst I can see newer 
>> commits in
>> the branch, I think these ones belonging to this patchset are still
>> missing?
> Um.. hrm.. in that case I think I've lost track of these ones :/

Looking back over my archives, I can see that Richard added a few more R-B tags 
v2. Probably the easiest way forward is for me to pick these up and re-send a 
v3 that
you can apply, so I'll go and do that.



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