[PATCH][DAGCombiner] Teach the DAGCombiner how to fold sext/aext/zext of constant build_vectors.

[Andrea Di Biagio]

Hi Ilia,

Sorry for the inconvenience.
I am currently looking into this.

Andrea

On Tue, Jan 28, 2014 at 10:24 AM, Ilia Filippov <ili.filippov at gmail.com> wrote:
> Hi Andrea, Nadav
> It seems that this patch causes llc core dump on the following example:
>
> ; ModuleID = 'p.bc'
> target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
> target triple = "i386-unknown-linux-gnu"
>
> ; Function Attrs: nounwind
> define <4 x i64> @f_f(<4 x i64> %__mask) #4 {
> allocas:
>   %AAA = select <4 x i1> <i1 true, i1 true, i1 false, i1 false>, <4 x i64>
> %__mask, <4 x i64> <i64 undef, i64 undef, i64 0, i64 0>
>   ret <4 x i64> %AAA
> }
> attributes #4 = { nounwind "target-cpu"="core-avx-i"
> "target-features"="+avx,+popcnt,+cmov" }
>
> Could you please have a look?
>
>
> 2014-01-27 Andrea Di Biagio <andrea.dibiagio at gmail.com>
>>
>> Thanks for the review!
>>
>> Committed revision 200234.
>>
>> On Mon, Jan 27, 2014 at 6:00 PM, Nadav Rotem <nrotem at apple.com> wrote:
>> > Hi Andrea,
>> >
>> > The patch LGTM.
>> >
>> > Thanks,
>> > Nadav
>> >
>> > On Jan 27, 2014, at 5:27 AM, Andrea Di Biagio
>> > <andrea.dibiagio at gmail.com> wrote:
>> >
>> >> <patch.diff>
>> >
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>
>