[LLVMdev] [3.6 Release] Bugfixes in Masked Load/Store

[Nadav Rotem]

Both r226791 and r226808 are safe to merge because they only effect AVX2 masked loads/stores. We should take these changes into the release branch. 

Elena, can you run the test suite with AVX2 enabled using 3.6?


> On Feb 17, 2015, at 11:00 AM, Hans Wennborg <hans at chromium.org> wrote:
> 
> On Tue, Feb 17, 2015 at 6:55 AM, Demikhovsky, Elena
> <elena.demikhovsky at intel.com> wrote:
>> I fixed 2 bugs in the trunk branch related to Masked Load / Store.
>> Since these intrinsics are generated by Loop Vectorizer on AVX2, a wrong code may be generated. One of the bugs was detected while gcc benchmark testing.
>> http://llvm.org/bugs/show_bug.cgi?id=22225
>> 
>> I think that the bugs should be fixed in 3.6.
>> I have 2 options
>> (1) promote changes of revisions 226791 and 226808 from trunk to 3.6
>> (2) disable the Masked Load / Store support for AVX2 in 3.6
>> 
>> Please let me know what do you think?
> 
> We'll be doing another release candidate of 3.6 so I guess we could
> potentially squeeze these in (though I wish you'd told me sooner, the
> patches are almost 4 weeks old).
> 
> Nadav, you're the X86 owner. Do you think r226791 and r226808 are safe to merge?
> 
> Thanks,
> Hans