[llvm] r365211 - [AMDGPU] DPP combiner: recognize identities for more opcodes

[Arsenault, Matthew via llvm-commits]

Needs more tests to cover the handled cases

On 7/5/19, 10:52, "llvm-commits on behalf of Jay Foad via llvm-commits" <llvm-commits-bounces at lists.llvm.org on behalf of llvm-commits at lists.llvm.org> wrote:

       switch (OrigMIOp) {
       default: break;
       case AMDGPU::V_ADD_U32_e32:
    +  case AMDGPU::V_ADD_U32_e64:
       case AMDGPU::V_ADD_I32_e32:
    +  case AMDGPU::V_ADD_I32_e64:
       case AMDGPU::V_OR_B32_e32:
    +  case AMDGPU::V_OR_B32_e64:
       case AMDGPU::V_SUBREV_U32_e32:
    +  case AMDGPU::V_SUBREV_U32_e64:
       case AMDGPU::V_SUBREV_I32_e32:
    +  case AMDGPU::V_SUBREV_I32_e64:
       case AMDGPU::V_MAX_U32_e32:
    +  case AMDGPU::V_MAX_U32_e64:
       case AMDGPU::V_XOR_B32_e32:
    +  case AMDGPU::V_XOR_B32_e64:
         if (OldOpnd->getImm() == 0)
           return true;
         break;
       case AMDGPU::V_AND_B32_e32:
    +  case AMDGPU::V_AND_B32_e64:
       case AMDGPU::V_MIN_U32_e32:
    +  case AMDGPU::V_MIN_U32_e64:
         if (static_cast<uint32_t>(OldOpnd->getImm()) ==
             std::numeric_limits<uint32_t>::max())
           return true;
         break;
       case AMDGPU::V_MIN_I32_e32:
    +  case AMDGPU::V_MIN_I32_e64:
         if (static_cast<int32_t>(OldOpnd->getImm()) ==
             std::numeric_limits<int32_t>::max())
           return true;
         break;
       case AMDGPU::V_MAX_I32_e32:
    +  case AMDGPU::V_MAX_I32_e64:
         if (static_cast<int32_t>(OldOpnd->getImm()) ==
             std::numeric_limits<int32_t>::min())
           return true;
         break;
       case AMDGPU::V_MUL_I32_I24_e32:
    +  case AMDGPU::V_MUL_I32_I24_e64:
       case AMDGPU::V_MUL_U32_U24_e32:
    +  case AMDGPU::V_MUL_U32_U24_e64:
         if (OldOpnd->getImm() == 1)
           return true;
         break;