[Mesa-dev] [PATCH 1/2] clover: assert struct argument is compiled usably

Francisco Jerez currojerez at riseup.net
Thu Jul 28 05:52:53 UTC 2016

Emil Velikov <emil.l.velikov at gmail.com> writes:

> On 6 June 2016 at 00:02, Vedran Miletić <vedran at miletic.net> wrote:
>> On 06/04/2016 04:18 AM, Francisco Jerez wrote:
>>> Serge Martin <edb+mesa at sigluy.net> writes:
>>>> From: Vedran Miletić <vedran at miletic.net>
>>>> Make sure that a struct argument did not get compiled into a pointer
>>>> type with the byval attribute. If we try to handle the pointer with
>>>> byval, we end up with the pointer size instead of the struct size.
>>> Ugh, is that a bug in the code below?  How are byval pointers supposed
>>> to be handled here?  Exactly as if the argument wasn't a pointer at all
>>> by providing a copy of the pointed-to object as-is in the kernel input
>>> buffer?  In that case wouldn't the code below need to pass the correct
>>> size of the pointed-to object as target/api size rather than the size of
>>> the pointer?
>> Yes, byval+pointer should be handled as there is no pointer at all.
>> I have tried passing the correct size, but IIRC LLVM AMDGPU backend does not
>> generate correct asm for byval+pointer variant. The simple solution is to
>> fail with an assert here unless Clang generates code both Clover and the
>> backend can handle.
> Gents, can anyone confirm if the series is still applicable for master
> or it's been superseded ?
Hi Emil, I don't think PATCH 1 is useful, but v1.1 of PATCH 2 still
makes sense.  It looks like it's going to need some minor rework though
for it to apply cleanly on master.

> Thanks
> Emil
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