[llvm-dev] llvm return value propagation & asm

[Davide Italiano via llvm-dev]

On Tue, Jan 31, 2017 at 2:47 AM, Carlo Kok <ck at remobjects.com> wrote:
>
>
> On 2017-01-30 18:41, Davide Italiano wrote:
>>
>> On Mon, Jan 30, 2017 at 9:34 AM, Reid Kleckner via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>>>
>>> We need to disable most forms of IPO on naked functions. We already do
>>> this
>>> in DeadArgElimination.cpp. We need to do it in more places.
>>>
>>
>> +1. Carlo, can you please open a bug?
>>
>
> Done
>
> https://llvm.org/bugs/show_bug.cgi?id=31811
>

I committed a fix (r293727), this should be enough for IPSCCP.
IPConstprop still needs to learn about the `naked` attribute, but
that's not part of the default pipeline.
If this really matters to you (and you use 4.0), you may consider
asking for a backport, but maybe it's too late (and given it's not a
regression maybe not really justifiable).

commit dcf8ccaf1afac34fc8fe0f9d7a2131b84a710ba6
Author: davide <davide at 91177308-0d34-0410-b5e6-96231b3b80d8>
Date:   Wed Feb 1 01:01:22 2017 +0000

    [IPSCCP] Teach how to not propagate return values of naked functions.

    Differential Revision:  https://reviews.llvm.org/D29360

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293727
91177308-0d34-0410-b5e6-96231b3b80d8


-- 
Davide

"There are no solved problems; there are only problems that are more
or less solved" -- Henri Poincare