[llvm] r232561 - Appease AArch64ISelLowering.cpp miscompiled by g++-4.7.2.

[NAKAMURA Takumi]

I know 4.7.2 is blacklisted and I have been blamed with 4.7.2 for
months. Please be patient.

2015-03-18 9:43 GMT+09:00 Eric Christopher <echristo at gmail.com>:
> Don't we normally do this by blacklisting the particular revision?
>
>
> On Tue, Mar 17, 2015, 4:02 PM NAKAMURA Takumi <geek4civic at gmail.com> wrote:
>>
>> Author: chapuni
>> Date: Tue Mar 17 17:55:01 2015
>> New Revision: 232561
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=232561&view=rev
>> Log:
>> Appease AArch64ISelLowering.cpp miscompiled by g++-4.7.2.
>>
>> I will revert this when 4.7.3 is ready.
>>
>> Modified:
>>     llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp
>>
>> Modified: llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp?rev=232561&r1=232560&r2=232561&view=diff
>>
>> ==============================================================================
>> --- llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp (original)
>> +++ llvm/trunk/lib/Target/AArch64/AArch64ISelLowering.cpp Tue Mar 17
>> 17:55:01 2015
>> @@ -7201,6 +7201,12 @@ static SDValue performConcatVectorsCombi
>>          (N00VT == MVT::v2i64 || N00VT == MVT::v4i32) &&
>>          N00VT.getScalarSizeInBits() == 4 * VT.getScalarSizeInBits()) {
>>        MVT MidVT = (N00VT == MVT::v2i64 ? MVT::v2i32 : MVT::v4i16);
>> +#if defined(__GNUC__)
>> +#if __GNUC__ == 4 && __GNUC_MINOR__ == 7 && __GNUC_PATCHLEVEL__ == 2
>> +      // FIXME: g++-4.7.2 might miscompile PerformDAGCombine().
>> +      asm volatile("":::"memory");
>> +#endif
>> +#endif
>>        MVT ConcatMidVT = MVT::getVectorVT(MidVT.getVectorElementType(),
>>                                           MidVT.getVectorNumElements() *
>> 2);
>>        return DAG.getNode(
>>
>>
>> _______________________________________________
>> llvm-commits mailing list
>> llvm-commits at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits