[all-commits] [llvm/llvm-project] 76cc94: Clean come dead code

[XinWang10 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 76cc9492121a402f7099f3fec822ea7192d3074e
      https://github.com/llvm/llvm-project/commit/76cc9492121a402f7099f3fec822ea7192d3074e
  Author: Wang, Xin10 <xin10.wang at intel.com>
  Date:   2023-04-23 (Sun, 23 Apr 2023)

  Changed paths:
    M llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
    M llvm/lib/CodeGen/IfConversion.cpp
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
    M llvm/lib/MC/MCParser/MasmParser.cpp

  Log Message:
  -----------
  Clean come dead code

These codes deleted are dead code, we never go into it.
1. In AggressiveAntiDepBreaker.cpp, have assert AntiDepReg != 0.
2. IfConversion.cpp, Kind can only be one unique value, so isFalse && isRev
    can never be true.
3. DAGCombiner.cpp, at line 3675, we have considered the condition like
```
  // fold (sub x, c) -> (add x, -c)
  if (N1C) {
    return DAG.getNode(ISD::ADD, DL, VT, N0,
                       DAG.getConstant(-N1C->getAPIntValue(), DL, VT));
  }
```
4. ScheduleDAGSDNodes.cpp, we have Latency > 1 at line 663
5. MasmParser.cpp, code exists in a switch-case block which decided by
    the value FirstTokenKind, at line 1621, FirstTokenKind could only be
    one of AsmToken::Dollar, AsmToken::At and AsmToken::Identifier.

Reviewed By: skan

Differential Revision: https://reviews.llvm.org/D148610