vr1 = extract_subreg vr2, 3 ... vr3 = extract_subreg vr1, 2 The end result is vr3 is equal to vr2 with subidx 2. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47592 91177308-0d34-0410-b5e6-96231b3b80d8