[PATCH] D15392: [InstCombine] fold trunc ([lshr] (bitcast vector) ) --> extractelement (PR25543)

[Sanjay Patel via llvm-commits]

spatel updated this revision to Diff 42639.
spatel added a comment.

Patch updated. 
After:
http://reviews.llvm.org/rL255399 (combine bitcasts)
http://reviews.llvm.org/rL255433 (canonicalize extractelement(bitcast X))

We don't get any changes for the tests in bitcast.ll and bitcast-bigendian.ll, so this patch should now preserve existing behavior other than adding the trunc -> extract optimization.


http://reviews.llvm.org/D15392

Files:
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  test/Transforms/InstCombine/trunc.ll

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