[llvm] [RISCV][RFC] Add additional opcodes to RISCVDAGToDAGISel::hasAllNBitUsers (PR #147728)

[Craig Topper via llvm-commits]

================
@@ -3621,20 +3625,39 @@ bool RISCVDAGToDAGISel::hasAllNBitUsers(SDNode *Node, unsigned Bits,
         break;
       [[fallthrough]];
     }
+    case RISCV::COPY:
+    case RISCV::PHI:
+    case RISCV::ADD:
+    case RISCV::ADDI:
     case RISCV::AND:
+    case RISCV::MUL:
     case RISCV::OR:
+    case RISCV::SUB:
     case RISCV::XOR:
     case RISCV::XORI:
     case RISCV::ANDN:
+    case RISCV::BREV8:
----------------
topperc wrote:

BREV8 and ORC_B are incorrect in RISCVOptWInstrs. We need to round to the nearest byte before doing the recursive call.

https://github.com/llvm/llvm-project/pull/147728