[PATCH] D128911: Emit table lookup from TargetLowering::expandCTTZ()

[Shubham Narlawar via Phabricator via llvm-commits]

gsocshubham added a comment.

SelectionDAG at start of expandCTTZ() -

  t0: ch = EntryToken
  t2: i32,ch = CopyFromReg t0, Register:i32 %0
      t3: i32 = cttz_zero_undef t2
    t14: i32 = select_cc t2, Constant:i32<0>, Constant:i32<0>, t3, seteq:ch
  t11: ch,glue = CopyToReg t0, Register:i32 $i0, t14
  t13: ch = SPISD::RET_FLAG t11, Constant:i32<8>, Register:i32 $i0, t11:1

At the end of the function, I am adding below nodes -

  t0: ch = EntryToken
  t2: i32,ch = CopyFromReg t0, Register:i32 %0
            t22: i32 = sub Constant:i32<0>, t2
          t25: i32 = and t2, t22
        t28: i32,i32 = smul_lohi t25, Constant:i32<125613361>
      t27: i32 = srl t28, Constant:i32<27>
      t15: glue = SPISD::CMPICC t2, Constant:i32<0>
    t17: i32 = SPISD::SELECT_ICC Constant:i32<0>, t27, Constant:i32<1>, t15
  t11: ch,glue = CopyToReg t0, Register:i32 $i0, t17
  t13: ch = SPISD::RET_FLAG t11, Constant:i32<8>, Register:i32 $i0, t11:1

I want to attach below 2 DAG nodes -

    t*: i32 = add GlobalAddress:i32<[32 x i8]* @f.table> 0, t9
  t*: i32,ch = load<(load (s8) from %ir.arrayidx), zext from i8> t0, t12, undef:i32

but I am unable to fetch reference to f.table


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  https://reviews.llvm.org/D128911/new/

https://reviews.llvm.org/D128911