[X86] Add printZeroUpperMove constant/shuffle comments helper. NFC.

Pull out helper instead of repeating switch cases.

Author: RKSimon

llvm/lib/Target/X86/X86MCInstLower.cpp

@@ -1536,6 +1536,52 @@ static void printConstant(const Constant *COp, unsigned BitWidth,
   }
 }
 
+static void printZeroUpperMove(const MachineInstr *MI, MCStreamer &OutStreamer,
+                               int SclWidth, int VecWidth,
+                               const char *ShuffleComment) {
+  assert(MI->getNumOperands() >= (1 + X86::AddrNumOperands) &&
+         "Unexpected number of operands!");
+
+  std::string Comment;
+  raw_string_ostream CS(Comment);
+  const MachineOperand &DstOp = MI->getOperand(0);
+  CS << X86ATTInstPrinter::getRegisterName(DstOp.getReg()) << " = ";
+
+  if (auto *C =
+          X86::getConstantFromPool(*MI, MI->getOperand(1 + X86::AddrDisp))) {
+    int CstEltSize = C->getType()->getScalarSizeInBits();
+    if (SclWidth == CstEltSize) {
+      if (auto *CI = dyn_cast<ConstantInt>(C)) {
+        CS << "[";
+        printConstant(CI->getValue(), CS);
+        for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
+          CS << ",0";
+        }
+        CS << "]";
+        OutStreamer.AddComment(CS.str());
+        return; // early-out
+      }
+
+      if (auto *CF = dyn_cast<ConstantFP>(C)) {
+        CS << "[";
+        printConstant(CF->getValue(), CS);
+        APFloat ZeroFP = APFloat::getZero(CF->getValue().getSemantics());
+        for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
+          CS << ",";
+          printConstant(ZeroFP, CS);
+        }
+        CS << "]";
+        OutStreamer.AddComment(CS.str());
+        return; // early-out
+      }
+    }
+  }
+
+  // We didn't find a constant load, fallback to a shuffle mask decode.
+  CS << ShuffleComment;
+  OutStreamer.AddComment(CS.str());
+}
+
 void X86AsmPrinter::EmitSEHInstruction(const MachineInstr *MI) {
   assert(MF->hasWinCFI() && "SEH_ instruction in function without WinCFI?");
   assert((getSubtarget().isOSWindows() || TM.getTargetTriple().isUEFI()) &&
@@ -1807,94 +1853,28 @@ static void addConstantComments(const MachineInstr *MI,
   }
 
   case X86::MOVSDrm:
-  case X86::MOVSSrm:
   case X86::VMOVSDrm:
-  case X86::VMOVSSrm:
   case X86::VMOVSDZrm:
-  case X86::VMOVSSZrm:
   case X86::MOVSDrm_alt:
-  case X86::MOVSSrm_alt:
   case X86::VMOVSDrm_alt:
-  case X86::VMOVSSrm_alt:
   case X86::VMOVSDZrm_alt:
-  case X86::VMOVSSZrm_alt:
-  case X86::MOVDI2PDIrm:
   case X86::MOVQI2PQIrm:
-  case X86::VMOVDI2PDIrm:
   case X86::VMOVQI2PQIrm:
-  case X86::VMOVDI2PDIZrm:
-  case X86::VMOVQI2PQIZrm: {
-    assert(MI->getNumOperands() >= (1 + X86::AddrNumOperands) &&
-           "Unexpected number of operands!");
-    int SclWidth = 32;
-    int VecWidth = 128;
-
-    switch (MI->getOpcode()) {
-    default:
-      llvm_unreachable("Invalid opcode");
-    case X86::MOVSDrm:
-    case X86::VMOVSDrm:
-    case X86::VMOVSDZrm:
-    case X86::MOVSDrm_alt:
-    case X86::VMOVSDrm_alt:
-    case X86::VMOVSDZrm_alt:
-    case X86::MOVQI2PQIrm:
-    case X86::VMOVQI2PQIrm:
-    case X86::VMOVQI2PQIZrm:
-      SclWidth = 64;
-      VecWidth = 128;
+  case X86::VMOVQI2PQIZrm:
+    printZeroUpperMove(MI, OutStreamer, 64, 128, "mem[0],zero");
       break;
-    case X86::MOVSSrm:
-    case X86::VMOVSSrm:
-    case X86::VMOVSSZrm:
-    case X86::MOVSSrm_alt:
-    case X86::VMOVSSrm_alt:
-    case X86::VMOVSSZrm_alt:
-    case X86::MOVDI2PDIrm:
-    case X86::VMOVDI2PDIrm:
-    case X86::VMOVDI2PDIZrm:
-      SclWidth = 32;
-      VecWidth = 128;
-      break;
-    }
-    std::string Comment;
-    raw_string_ostream CS(Comment);
-    const MachineOperand &DstOp = MI->getOperand(0);
-    CS << X86ATTInstPrinter::getRegisterName(DstOp.getReg()) << " = ";
 
-    if (auto *C =
-            X86::getConstantFromPool(*MI, MI->getOperand(1 + X86::AddrDisp))) {
-      if ((unsigned)SclWidth == C->getType()->getScalarSizeInBits()) {
-        if (auto *CI = dyn_cast<ConstantInt>(C)) {
-          CS << "[";
-          printConstant(CI->getValue(), CS);
-          for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
-            CS << ",0";
-          }
-          CS << "]";
-          OutStreamer.AddComment(CS.str());
-          break; // early-out
-        }
-        if (auto *CF = dyn_cast<ConstantFP>(C)) {
-          CS << "[";
-          printConstant(CF->getValue(), CS);
-          APFloat ZeroFP = APFloat::getZero(CF->getValue().getSemantics());
-          for (int I = 1, E = VecWidth / SclWidth; I < E; ++I) {
-            CS << ",";
-            printConstant(ZeroFP, CS);
-          }
-          CS << "]";
-          OutStreamer.AddComment(CS.str());
-          break; // early-out
-        }
-      }
-    }
-
-    // We didn't find a constant load, fallback to a shuffle mask decode.
-    CS << (SclWidth == 32 ? "mem[0],zero,zero,zero" : "mem[0],zero");
-    OutStreamer.AddComment(CS.str());
+  case X86::MOVSSrm:
+  case X86::VMOVSSrm:
+  case X86::VMOVSSZrm:
+  case X86::MOVSSrm_alt:
+  case X86::VMOVSSrm_alt:
+  case X86::VMOVSSZrm_alt:
+  case X86::MOVDI2PDIrm:
+  case X86::VMOVDI2PDIrm:
+  case X86::VMOVDI2PDIZrm:
+    printZeroUpperMove(MI, OutStreamer, 32, 128, "mem[0],zero,zero,zero");
     break;
-  }
 
 #define MOV_CASE(Prefix, Suffix)                                               \
   case X86::Prefix##MOVAPD##Suffix##rm:                                        \