[TableGen][GISel][NFC] clang-tidy GlobalISelEmitter.cpp (#90492)

Fixes a couple of style issues, such as:

- unused includes
- variable naming
- `else if` after `return`

llvm/utils/TableGen/GlobalISelEmitter.cpp

@@ -45,12 +45,10 @@
 #include "llvm/Support/CodeGenCoverage.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
-#include "llvm/Support/SaveAndRestore.h"
 #include "llvm/Support/ScopedPrinter.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
-#include <numeric>
 #include <string>
 
 using namespace llvm;
@@ -792,8 +790,8 @@ Expected<InstructionMatcher &> GlobalISelEmitter::createAndImportSelDAGMatcher(
                "nested predicate that uses operands");
         TreePattern *TP = Predicate.getOrigPatFragRecord();
         WaitingForNamedOperands = TP->getNumArgs();
-        for (unsigned i = 0; i < WaitingForNamedOperands; ++i)
-          StoreIdxForName[getScopedName(Call.Scope, TP->getArgName(i))] = i;
+        for (unsigned I = 0; I < WaitingForNamedOperands; ++I)
+          StoreIdxForName[getScopedName(Call.Scope, TP->getArgName(I))] = I;
       }
       InsnMatcher.addPredicate<GenericInstructionPredicateMatcher>(Predicate);
       continue;
@@ -878,8 +876,8 @@ Expected<InstructionMatcher &> GlobalISelEmitter::createAndImportSelDAGMatcher(
     if (IsIntrinsic && !II)
       return failedImport("Expected IntInit containing intrinsic ID)");
 
-    for (unsigned i = 0; i != NumChildren; ++i) {
-      const TreePatternNode &SrcChild = Src.getChild(i);
+    for (unsigned I = 0; I != NumChildren; ++I) {
+      const TreePatternNode &SrcChild = Src.getChild(I);
 
       // We need to determine the meaning of a literal integer based on the
       // context. If this is a field required to be an immediate (such as an
@@ -888,19 +886,19 @@ Expected<InstructionMatcher &> GlobalISelEmitter::createAndImportSelDAGMatcher(
       // argument that is required to be an immediate, we should not emit an LLT
       // type check, and should not be looking for a G_CONSTANT defined
       // register.
-      bool OperandIsImmArg = SrcGIOrNull->isInOperandImmArg(i);
+      bool OperandIsImmArg = SrcGIOrNull->isInOperandImmArg(I);
 
       // SelectionDAG allows pointers to be represented with iN since it doesn't
       // distinguish between pointers and integers but they are different types
       // in GlobalISel. Coerce integers to pointers to address space 0 if the
       // context indicates a pointer.
       //
-      bool OperandIsAPointer = SrcGIOrNull->isInOperandAPointer(i);
+      bool OperandIsAPointer = SrcGIOrNull->isInOperandAPointer(I);
 
       if (IsIntrinsic) {
         // For G_INTRINSIC/G_INTRINSIC_W_SIDE_EFFECTS, the operand immediately
         // following the defs is an intrinsic ID.
-        if (i == 0) {
+        if (I == 0) {
           OperandMatcher &OM =
               InsnMatcher.addOperand(OpIdx++, SrcChild.getName(), TempOpIdx);
           OM.addPredicate<IntrinsicIDOperandMatcher>(II);
@@ -911,8 +909,8 @@ Expected<InstructionMatcher &> GlobalISelEmitter::createAndImportSelDAGMatcher(
         //
         // Note that we have to look at the i-1th parameter, because we don't
         // have the intrinsic ID in the intrinsic's parameter list.
-        OperandIsAPointer |= II->isParamAPointer(i - 1);
-        OperandIsImmArg |= II->isParamImmArg(i - 1);
+        OperandIsAPointer |= II->isParamAPointer(I - 1);
+        OperandIsImmArg |= II->isParamImmArg(I - 1);
       }
 
       if (auto Error =
@@ -967,9 +965,9 @@ Error GlobalISelEmitter::importChildMatcher(
     // The "name" of a non-leaf complex pattern (MY_PAT $op1, $op2) is
     // "MY_PAT:op1:op2" and the ones with same "name" represent same operand.
     std::string PatternName = std::string(SrcChild.getOperator()->getName());
-    for (unsigned i = 0; i < SrcChild.getNumChildren(); ++i) {
+    for (unsigned I = 0; I < SrcChild.getNumChildren(); ++I) {
       PatternName += ":";
-      PatternName += SrcChild.getChild(i).getName();
+      PatternName += SrcChild.getChild(I).getName();
     }
     SrcChildName = PatternName;
   }
@@ -1042,11 +1040,11 @@ Error GlobalISelEmitter::importChildMatcher(
               OM, SrcChild.getOperator(), TempOpIdx))
         return Error;
 
-      for (unsigned i = 0, e = SrcChild.getNumChildren(); i != e; ++i) {
-        auto &SubOperand = SrcChild.getChild(i);
+      for (unsigned I = 0, E = SrcChild.getNumChildren(); I != E; ++I) {
+        auto &SubOperand = SrcChild.getChild(I);
         if (!SubOperand.getName().empty()) {
           if (auto Error = Rule.defineComplexSubOperand(
-                  SubOperand.getName(), SrcChild.getOperator(), RendererID, i,
+                  SubOperand.getName(), SrcChild.getOperator(), RendererID, I,
                   SrcChildName))
             return Error;
         }
@@ -1232,10 +1230,12 @@ Expected<action_iterator> GlobalISelEmitter::importExplicitUseRenderer(
     if (DstChild.getOperator()->getName() == "tframeindex") {
       DstMIBuilder.addRenderer<CopyRenderer>(DstChild.getName());
       return InsertPt;
-    } else if (DstChild.getOperator()->getName() == "imm") {
+    }
+    if (DstChild.getOperator()->getName() == "imm") {
       DstMIBuilder.addRenderer<CopyConstantAsImmRenderer>(DstChild.getName());
       return InsertPt;
-    } else if (DstChild.getOperator()->getName() == "fpimm") {
+    }
+    if (DstChild.getOperator()->getName() == "fpimm") {
       DstMIBuilder.addRenderer<CopyFConstantAsFPImmRenderer>(
           DstChild.getName());
       return InsertPt;
@@ -1748,7 +1748,7 @@ Error GlobalISelEmitter::importDefaultOperandRenderers(
 
     if (const DefInit *DefaultDefOp = dyn_cast<DefInit>(DefaultOp)) {
       std::optional<LLTCodeGen> OpTyOrNone = MVTToLLT(N.getSimpleType(0));
-      auto Def = DefaultDefOp->getDef();
+      auto *Def = DefaultDefOp->getDef();
       if (Def->getName() == "undef_tied_input") {
         unsigned TempRegID = M.allocateTempRegID();
         M.insertAction<MakeTempRegisterAction>(InsertPt, *OpTyOrNone,
@@ -2449,13 +2449,13 @@ void GlobalISelEmitter::run(raw_ostream &OS) {
   }
 
   // Comparison function to order records by name.
-  auto orderByName = [](const Record *A, const Record *B) {
+  auto OrderByName = [](const Record *A, const Record *B) {
     return A->getName() < B->getName();
   };
 
   std::vector<Record *> ComplexPredicates =
       RK.getAllDerivedDefinitions("GIComplexOperandMatcher");
-  llvm::sort(ComplexPredicates, orderByName);
+  llvm::sort(ComplexPredicates, OrderByName);
 
   std::vector<StringRef> CustomRendererFns;
   transform(RK.getAllDerivedDefinitions("GICustomOperandRenderer"),