[llvm] r223113 - Add support for ARM modified-immediate assembly syntax.

[Steven Wu]

Couldn’t find anything related to tilde or how an expression gets evaluated to an immediate in ARM manual. Any authority over ARM assembly language?

Steven

> On Feb 11, 2015, at 3:37 PM, Eric Christopher <echristo at gmail.com> wrote:
> 
> I think the first is to get definite proof on the instruction being legal or not.
> 
> -eric
> 
> On Wed Feb 11 2015 at 3:36:46 PM Steven Wu <stevenwu at apple.com <mailto:stevenwu at apple.com>> wrote:
> Unfortunately, I caught this quite late and this commit can no longer back out cleanly. I also don’t have definite proof for such instruction being legal but it certainly looks fine to me. :)
> The easy fix might be to remove this error and shrink the value to 32 bits, but this error message is actually quite useful.
> 
> 
>> On Feb 11, 2015, at 3:01 PM, Eric Christopher <echristo at gmail.com <mailto:echristo at gmail.com>> wrote:
>> 
>> Hi Steven,
>> 
>> Is it a legal instruction? :)
>> 
>> If so, it's been a week, I think we should just revert back to green and add a test that the instruction is assembled properly.
>> 
>> -eric
>> 
>> On Wed Feb 11 2015 at 2:58:52 PM Steven Wu <stevenwu at apple.com <mailto:stevenwu at apple.com>> wrote:
>> Hi Asiri
>> 
>> Have you had a chance to look at this problem yet? Since the immediates are evaluated as int64_t, I cannot see an easy way to fix this. I don’t think we can allow a false positive for this error message either. Do you have any solution?
>> 
>> Thanks
>> 
>> Steven
>> 
>>> On Feb 4, 2015, at 12:10 PM, Steven Wu <stevenwu at apple.com <mailto:stevenwu at apple.com>> wrote:
>>> 
>>> Hi Asiri
>>> 
>>> I see this instruction, which I believe is legal, gets an error now:
>>> 	mvn sp, #(~(0xffffff00))
>>> Can you look at this as well? Thanks!
>>> 
>>> Steven
>>> 
>>> 
>>>> On Dec 4, 2014, at 7:27 AM, Asiri Rathnayake <asiri.rathnayake at gmail.com <mailto:asiri.rathnayake at gmail.com>> wrote:
>>>> 
>>>> Should be fixed in r223366
>>>> 
>>>> Best,
>>>> 
>>>> - Asiri
>>>> 
>>>> On Wed, Dec 3, 2014 at 6:39 PM, Joerg Sonnenberger <joerg at britannica.bec.de <mailto:joerg at britannica.bec.de>> wrote:
>>>> On Tue, Dec 02, 2014 at 10:53:21AM -0000, Asiri Rathnayake wrote:
>>>> > Author: asiri
>>>> > Date: Tue Dec  2 04:53:20 2014
>>>> > New Revision: 223113
>>>> >
>>>> > URL: http://llvm.org/viewvc/llvm-project?rev=223113&view=rev <http://llvm.org/viewvc/llvm-project?rev=223113&view=rev>
>>>> > Log:
>>>> > Add support for ARM modified-immediate assembly syntax.
>>>> 
>>>> I see failures like
>>>> 
>>>>         adds r3, r0, #(32 * 4)
>>>> 
>>>> being rejected now. Can you check if that is your commit?
>>>> 
>>>> Joerg
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