[llvm-commits] [llvm] r166155 - in /llvm/trunk: lib/CodeGen/SelectionDAG/DAGCombiner.cpp test/CodeGen/X86/extract-concat.ll

[Eli Friedman]

On Wed, Oct 17, 2012 at 4:45 PM, Michael Liao <michael.liao at intel.com> wrote:
> Author: hliao
> Date: Wed Oct 17 18:45:54 2012
> New Revision: 166155
>
> URL: http://llvm.org/viewvc/llvm-project?rev=166155&view=rev
> Log:
> Revert part of r166049 back and enable test case in r166125.
>
> - Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid
>   when '...' are all 'undef's.

Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is
unconditionally valid.

-Eli