[all-commits] [llvm/llvm-project] c21cd1: [DirectX backend] avoid generate redundant bitcast...

[Xiang Li via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c21cd168bb74175fe5fe33a404646b7d6dfe46a3
      https://github.com/llvm/llvm-project/commit/c21cd168bb74175fe5fe33a404646b7d6dfe46a3
  Author: Xiang Li <python3kgae at outlook.com>
  Date:   2023-09-01 (Fri, 01 Sep 2023)

  Changed paths:
    M llvm/lib/Target/DirectX/DXILPrepare.cpp
    M llvm/test/CodeGen/DirectX/typed_ptr.ll

  Log Message:
  -----------
  [DirectX backend] avoid generate redundant bitcast in DXILPrepareModule (#65163)

When emit NoOp bitcast for GEP Ptr Operand, should use SourceElementType
instead of ResultElementType.

**Behavior Before Change**
Redundant bitcast like 
   ` bitcast ptr addrspace(3) @gs to ptr addrspace(3)`
 will be generated for llvm/test/CodeGen/DirectX/typed_ptr.ll

**Behavior After Change**
  No bitcast will be generated.

Fixes https://github.com/llvm/llvm-project/issues/65183