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

[Moshe Kravchik]

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.
> >
> > _______________________________________________
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> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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> >
 		 	   		  
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