llvm dev - Jun 2013 - [LLVMdev] Apple clang 4.2 based on llvm 3.2 produces a wrong "instruction requires:arm-mode"

So probably it is a LLVM issue - can anyone from the team look at it and let me
know if there is anything to do.
Moshe
> Date: Wed, 12 Jun 2013 10:53:56 -0700
> Subject: Re: [LLVMdev] Apple clang 4.2 based on llvm 3.2 produces a wrong
"instruction requires:arm-mode"
> From: t.p.northover at gmail.com
> To: mkravchik at hotmail.com
> CC: llvmdev at cs.uiuc.edu
> 
> Hi Moshe,
> 
> The others are right that you'll likely get better Apple-specific help
> at the forums, but this problem happens to be the same in generic
> LLVM.
> 
> > ./src/asm.s:30:5: error: instruction requires a CPU feature not
currently enabled
> >
> >     add r2, pc, r2
> >
> > According to ARM specification:
> 
> The specifications you're referring to are a little vague, and the
> actual instruction definitions give the real situation (page/section
> A3-308).
> 
> I think it boils down to:
> "add r2, r2, pc" should be allowed (but LLVM doesn't, this is
a bug).
> "add r2, pc" should be allowed (and is)
> "add r2, pc, r2" should be allowed *if* it's in an IT block
(but LLVM
> doesn't, this is a bug).
> 
> That last one might be rather tricky to implement. I'll take a bit of
> a look, but may not have time to do it properly. Reporting it at
> llvm.org/bugs (and/or bugreporter.apple.com since that seems to be
> your platform) would make sure it doesn't get lost.
> 
> Cheers.
> 
> Tim.
 		 	   		  
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Hi Moshe,

Tim just did tell you what to do :)

"Reporting it at llvm.org/bugs (and/or bugreporter.apple.com since
that seems to be your platform) would make sure it doesn't get lost."

So filing a bug report would be best.

-eric


On Wed, Jun 12, 2013 at 12:18 PM, Moshe Kravchik <mkravchik at
hotmail.com> wrote:
> So probably it is a LLVM issue - can anyone from the team look at it and
let
> me know if there is anything to do.
>
> Moshe
>
>> Date: Wed, 12 Jun 2013 10:53:56 -0700
>> Subject: Re: [LLVMdev] Apple clang 4.2 based on llvm 3.2 produces a
wrong
>> "instruction requires:arm-mode"
>> From: t.p.northover at gmail.com
>> To: mkravchik at hotmail.com
>> CC: llvmdev at cs.uiuc.edu
>
>>
>> Hi Moshe,
>>
>> The others are right that you'll likely get better Apple-specific
help
>> at the forums, but this problem happens to be the same in generic
>> LLVM.
>>
>> > ./src/asm.s:30:5: error: instruction requires a CPU feature not
>> > currently enabled
>> >
>> > add r2, pc, r2
>> >
>> > According to ARM specification:
>>
>> The specifications you're referring to are a little vague, and the
>> actual instruction definitions give the real situation (page/section
>> A3-308).
>>
>> I think it boils down to:
>> "add r2, r2, pc" should be allowed (but LLVM doesn't,
this is a bug).
>> "add r2, pc" should be allowed (and is)
>> "add r2, pc, r2" should be allowed *if* it's in an IT
block (but LLVM
>> doesn't, this is a bug).
>>
>> That last one might be rather tricky to implement. I'll take a bit
of
>> a look, but may not have time to do it properly. Reporting it at
>> llvm.org/bugs (and/or bugreporter.apple.com since that seems to be
>> your platform) would make sure it doesn't get lost.
>>
>> Cheers.
>>
>> Tim.
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

Hi Eric,
Following Tim's and your advice I filled the
bug:http://llvm.org/bugs/show_bug.cgi?id=16315
Haven't seen any reaction to it from LLVM developers so far. This is the
first time I submit a bug to LLVM, maybe I need to set some fields differently
to trigger their attention?
Moshe
> Date: Wed, 12 Jun 2013 13:10:21 -0700
> Subject: Re: [LLVMdev] Apple clang 4.2 based on llvm 3.2 produces a wrong
"instruction requires:arm-mode"
> From: echristo at gmail.com
> To: mkravchik at hotmail.com
> CC: t.p.northover at gmail.com; llvmdev at cs.uiuc.edu
> 
> Hi Moshe,
> 
> Tim just did tell you what to do :)
> 
> "Reporting it at llvm.org/bugs (and/or bugreporter.apple.com since
> that seems to be your platform) would make sure it doesn't get
lost."
> 
> So filing a bug report would be best.
> 
> -eric
> 
> 
> On Wed, Jun 12, 2013 at 12:18 PM, Moshe Kravchik <mkravchik at
hotmail.com> wrote:
> > So probably it is a LLVM issue - can anyone from the team look at it
and let
> > me know if there is anything to do.
> >
> > Moshe
> >
> >> Date: Wed, 12 Jun 2013 10:53:56 -0700
> >> Subject: Re: [LLVMdev] Apple clang 4.2 based on llvm 3.2 produces
a wrong
> >> "instruction requires:arm-mode"
> >> From: t.p.northover at gmail.com
> >> To: mkravchik at hotmail.com
> >> CC: llvmdev at cs.uiuc.edu
> >
> >>
> >> Hi Moshe,
> >>
> >> The others are right that you'll likely get better
Apple-specific help
> >> at the forums, but this problem happens to be the same in generic
> >> LLVM.
> >>
> >> > ./src/asm.s:30:5: error: instruction requires a CPU feature
not
> >> > currently enabled
> >> >
> >> > add r2, pc, r2
> >> >
> >> > According to ARM specification:
> >>
> >> The specifications you're referring to are a little vague, and
the
> >> actual instruction definitions give the real situation
(page/section
> >> A3-308).
> >>
> >> I think it boils down to:
> >> "add r2, r2, pc" should be allowed (but LLVM
doesn't, this is a bug).
> >> "add r2, pc" should be allowed (and is)
> >> "add r2, pc, r2" should be allowed *if* it's in an
IT block (but LLVM
> >> doesn't, this is a bug).
> >>
> >> That last one might be rather tricky to implement. I'll take a
bit of
> >> a look, but may not have time to do it properly. Reporting it at
> >> llvm.org/bugs (and/or bugreporter.apple.com since that seems to be
> >> your platform) would make sure it doesn't get lost.
> >>
> >> Cheers.
> >>
> >> Tim.
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
 		 	   		  
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