[NFCI][LLVM] Adopt ArrayRef::consume_front() in a few places (#146793)

Author: jurahul

llvm/include/llvm/DebugInfo/CodeView/SymbolRecord.h

@@ -240,32 +240,28 @@ struct BinaryAnnotationIterator
     if (Annotations.empty())
       return -1;
 
-    uint8_t FirstByte = Annotations.front();
-    Annotations = Annotations.drop_front();
+    uint8_t FirstByte = Annotations.consume_front();
 
     if ((FirstByte & 0x80) == 0x00)
       return FirstByte;
 
     if (Annotations.empty())
       return -1;
 
-    uint8_t SecondByte = Annotations.front();
-    Annotations = Annotations.drop_front();
+    uint8_t SecondByte = Annotations.consume_front();
 
     if ((FirstByte & 0xC0) == 0x80)
       return ((FirstByte & 0x3F) << 8) | SecondByte;
 
     if (Annotations.empty())
       return -1;
 
-    uint8_t ThirdByte = Annotations.front();
-    Annotations = Annotations.drop_front();
+    uint8_t ThirdByte = Annotations.consume_front();
 
     if (Annotations.empty())
       return -1;
 
-    uint8_t FourthByte = Annotations.front();
-    Annotations = Annotations.drop_front();
+    uint8_t FourthByte = Annotations.consume_front();
 
     if ((FirstByte & 0xE0) == 0xC0)
       return ((FirstByte & 0x1F) << 24) | (SecondByte << 16) |

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -7513,11 +7513,9 @@ std::vector<FunctionSummary::ParamAccess>
 ModuleSummaryIndexBitcodeReader::parseParamAccesses(ArrayRef<uint64_t> Record) {
   auto ReadRange = [&]() {
     APInt Lower(FunctionSummary::ParamAccess::RangeWidth,
-                BitcodeReader::decodeSignRotatedValue(Record.front()));
-    Record = Record.drop_front();
+                BitcodeReader::decodeSignRotatedValue(Record.consume_front()));
     APInt Upper(FunctionSummary::ParamAccess::RangeWidth,
-                BitcodeReader::decodeSignRotatedValue(Record.front()));
-    Record = Record.drop_front();
+                BitcodeReader::decodeSignRotatedValue(Record.consume_front()));
     ConstantRange Range{Lower, Upper};
     assert(!Range.isFullSet());
     assert(!Range.isUpperSignWrapped());
@@ -7528,16 +7526,13 @@ ModuleSummaryIndexBitcodeReader::parseParamAccesses(ArrayRef<uint64_t> Record) {
   while (!Record.empty()) {
     PendingParamAccesses.emplace_back();
     FunctionSummary::ParamAccess &ParamAccess = PendingParamAccesses.back();
-    ParamAccess.ParamNo = Record.front();
-    Record = Record.drop_front();
+    ParamAccess.ParamNo = Record.consume_front();
     ParamAccess.Use = ReadRange();
-    ParamAccess.Calls.resize(Record.front());
-    Record = Record.drop_front();
+    ParamAccess.Calls.resize(Record.consume_front());
     for (auto &Call : ParamAccess.Calls) {
-      Call.ParamNo = Record.front();
-      Record = Record.drop_front();
-      Call.Callee = std::get<0>(getValueInfoFromValueId(Record.front()));
-      Record = Record.drop_front();
+      Call.ParamNo = Record.consume_front();
+      Call.Callee =
+          std::get<0>(getValueInfoFromValueId(Record.consume_front()));
       Call.Offsets = ReadRange();
     }
   }

llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

@@ -2085,8 +2085,8 @@ TypeIndex CodeViewDebug::lowerTypeFunction(const DISubroutineType *Ty) {
   ArrayRef<TypeIndex> ArgTypeIndices = {};
   if (!ReturnAndArgTypeIndices.empty()) {
     auto ReturnAndArgTypesRef = ArrayRef(ReturnAndArgTypeIndices);
-    ReturnTypeIndex = ReturnAndArgTypesRef.front();
-    ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
+    ReturnTypeIndex = ReturnAndArgTypesRef.consume_front();
+    ArgTypeIndices = ReturnAndArgTypesRef;
   }
 
   ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);

llvm/lib/CodeGen/MachinePostDominators.cpp

@@ -99,8 +99,8 @@ MachineBasicBlock *MachinePostDominatorTree::findNearestCommonDominator(
     ArrayRef<MachineBasicBlock *> Blocks) const {
   assert(!Blocks.empty());
 
-  MachineBasicBlock *NCD = Blocks.front();
-  for (MachineBasicBlock *BB : Blocks.drop_front()) {
+  MachineBasicBlock *NCD = Blocks.consume_front();
+  for (MachineBasicBlock *BB : Blocks) {
     NCD = Base::findNearestCommonDominator(NCD, BB);
 
     // Stop when the root is reached.

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -1511,8 +1511,8 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
 /// \returns true if all of the values in \p VL have the same type or false
 /// otherwise.
 static bool allSameType(ArrayRef<Value *> VL) {
-  Type *Ty = VL.front()->getType();
-  return all_of(VL.drop_front(), [&](Value *V) { return V->getType() == Ty; });
+  Type *Ty = VL.consume_front()->getType();
+  return all_of(VL, [&](Value *V) { return V->getType() == Ty; });
 }
 
 /// \returns True if in-tree use also needs extract. This refers to
@@ -5567,8 +5567,8 @@ static bool arePointersCompatible(Value *Ptr1, Value *Ptr2,
 /// Calculates minimal alignment as a common alignment.
 template <typename T>
 static Align computeCommonAlignment(ArrayRef<Value *> VL) {
-  Align CommonAlignment = cast<T>(VL.front())->getAlign();
-  for (Value *V : VL.drop_front())
+  Align CommonAlignment = cast<T>(VL.consume_front())->getAlign();
+  for (Value *V : VL)
     CommonAlignment = std::min(CommonAlignment, cast<T>(V)->getAlign());
   return CommonAlignment;
 }
@@ -9483,8 +9483,8 @@ class PHIHandler {
       ArrayRef<unsigned> IncomingValues = P.second;
       if (IncomingValues.size() <= 1)
         continue;
-      unsigned BasicI = IncomingValues.front();
-      for (unsigned I : IncomingValues.drop_front()) {
+      unsigned BasicI = IncomingValues.consume_front();
+      for (unsigned I : IncomingValues) {
         assert(all_of(enumerate(Operands[I]),
                       [&](const auto &Data) {
                         return !Data.value() ||