remove redundent log

Author: rez5427

llvm/lib/CodeGen/RegisterCoalescer.cpp

@@ -1328,8 +1328,6 @@ bool RegisterCoalescer::reMaterializeDef(const CoalescerPair &CP,
 
   // Skip rematerialization for physical registers used as return values within
   // the same basic block to enable better coalescing.
-  
-    
   if (DstReg.isPhysical()) {
     MachineBasicBlock *MBB = CopyMI->getParent();
     if (DefMI->getParent() == MBB) {
@@ -1353,34 +1351,35 @@ bool RegisterCoalescer::reMaterializeDef(const CoalescerPair &CP,
             break;
           // If there's a return instruction that uses this register, skip remat
           if (MI.isReturn() && MI.readsRegister(DstReg, TRI)) {
-            // Exception: if DefMI is moving a constant and SrcReg has no other uses
-            // (besides copies), rematerialization is beneficial to eliminate the def
+            // Exception: if DefMI is moving a constant and SrcReg has no other
+            // uses (besides copies), rematerialization is beneficial to
+            // eliminate the def
             if (DefMI->isMoveImmediate()) {
-              // Quick check: if there's only one use and it's this copy, definitely remat
+              // Quick check: if there's only one use and it's this copy,
+              // definitely remat
               if (MRI->hasOneNonDBGUse(SrcReg)) {
-                LLVM_DEBUG(dbgs() << "\tAllow remat: single use constant move\n");
+                LLVM_DEBUG(dbgs()
+                           << "\tAllow remat: single use constant move\n");
                 break;
               }
-              
+
               // Check all uses to see if they're all copies
               bool OnlyUsedByCopies = true;
               unsigned UseCount = 0;
               for (const MachineOperand &MO : MRI->use_operands(SrcReg)) {
-                const MachineInstr *UseMI = MO.getParent();  // 改为 const
+                const MachineInstr *UseMI = MO.getParent();
                 if (!UseMI->isCopy() && !UseMI->isSubregToReg()) {
                   OnlyUsedByCopies = false;
                   break;
                 }
                 UseCount++;
               }
-              
+
               if (OnlyUsedByCopies && UseCount > 0) {
-                LLVM_DEBUG(dbgs() << "\tAllow remat: constant move only used by "
-                                  << UseCount << " copies\n");
-                break; // Allow rematerialization
+                break;
               }
             }
-            
+
             LLVM_DEBUG(dbgs() << "\tSkip remat for return register: "
                               << printReg(DstReg, TRI) << '\n');
             return false;