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0b71d3972d
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Author SHA1 Message Date
Evan Cheng
0b71d3972d Optimize: 
r1025 = s/zext r1024, 4
  r1026 = extract_subreg r1025, 4
to:
  r1026 = copy r1024


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122925 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-01-05 23:06:49 +00:00