[llvm-commits] [FIX+regression-test] PR13617: LLVM+Clang emits movw instrucionts with -march=armv6zk

[Stepan Dyatkovskiy]

Reattached.
-Stepan.
Bill Wendling wrote:
> ENOPATCH.
>
> -bw
>
> On Sep 5, 2012, at 3:13 AM, Stepan Dyatkovskiy <STPWORLD at narod.ru> wrote:
>
>> ping.
>> Stepan Dyatkovskiy wrote:
>>> ping...
>>> Stepan Dyatkovskiy wrote:
>>>> ping.
>>>> Stepan Dyatkovskiy wrote:
>>>>> Hi all!
>>>>>
>>>>> The bug is fired when dag-to-dag isel meets 'add' instruction with
>>>>> second operand that is negative number less than -256. E.g.:
>>>>> add %var, -1000
>>>>>
>>>>> ARM dag-to-dag instruction selector matches the pattern that emits
>>>>> (sub %var (MOVi16 Rd, 1000))
>>>>>
>>>>> After fast TableGen learning, I found that it ignores instruction
>>>>> predicates for patterns (ARMPat, ARMV6Pat and so on) while generating
>>>>> MatcherTable. So it ignores restrictions defined for MOVi16 instruction
>>>>> (ARMv6t2 and higher).
>>>>>
>>>>> I also found that for several patterns this behaviour compensated by
>>>>> adding 'Requires' predicate explicitly. So, I did the same in this
>>>>> patch. Please find the patch in attachment for review.
>>>>>
>>>>> -Stepan.
>>>>
>>>
>>
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>> llvm-commits at cs.uiuc.edu
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>

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