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

[Ilia Filippov]

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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