[ADT] Move FixedPoint.h from Clang to LLVM.

[ebevhan]

Summary

This patch moves FixedPointSemantics and APFixedPoint
from Clang to LLVM ADT.

This will make it easier to use the fixed-point
classes in LLVM for constructing an IR builder for
fixed-point and for reusing the APFixedPoint class
for constant evaluation purposes.

RFC: http://lists.llvm.org/pipermail/llvm-dev/2020-August/144025.html

[ebevhan]

Fix some formatting.

[leonardchan]

The patch seems straightforward. Other than moving code and trimming llvm:: from types, not sure if there's anything else I should expect. LGTM.

[rjmccall]

LGTM

[ebevhan]

Thanks for reviewing! I'm not really sure who to add as reviewers for D85314, though, and no one has replied to the RFC on the mailing list yet.

clang/include/clang/AST/APValue.h

 //===--- APValue.h - Union class for APFloat/APSInt/Complex -----*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 //  This file defines the APValue class.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_AST_APVALUE_H
 #define LLVM_CLANG_AST_APVALUE_H
 
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/LLVM.h"
+#include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/PointerUnion.h"
 
 namespace clang {
   class AddrLabelExpr;
   class ASTContext;
   class CharUnits;
   class CXXRecordDecl;
   class Decl;
   class DiagnosticBuilder;
   class Expr;
   class FieldDecl;
   struct PrintingPolicy;
   class Type;
   class ValueDecl;
+  class QualType;
 
 /// Symbolic representation of typeid(T) for some type T.
 class TypeInfoLValue {
   const Type *T;
 
 public:
   TypeInfoLValue() : T() {}
   explicit TypeInfoLValue(const Type *T);

 };
 }
 
 namespace clang {
 /// APValue - This class implements a discriminated union of [uninitialized]
 /// [APSInt] [APFloat], [Complex APSInt] [Complex APFloat], [Expr + Offset],
 /// [Vector: N * APValue], [Array: N * APValue]
 class APValue {
+  typedef llvm::APFixedPoint APFixedPoint;
   typedef llvm::APSInt APSInt;
   typedef llvm::APFloat APFloat;
 public:
   enum ValueKind {
     /// There is no such object (it's outside its lifetime).
     None,
     /// This object has an indeterminate value (C++ [basic.indet]).
     Indeterminate,

clang/include/clang/AST/ASTContext.h

 #include <memory>
 #include <string>
 #include <type_traits>
 #include <utility>
 #include <vector>
 
 namespace llvm {
 
+class APFixedPoint;
+class FixedPointSemantics;
 struct fltSemantics;
 template <typename T, unsigned N> class SmallPtrSet;
 
 } // namespace llvm
 
 namespace clang {
 
-class APFixedPoint;
 class APValue;
 class ASTMutationListener;
 class ASTRecordLayout;
 class AtomicExpr;
 class BlockExpr;
 class BuiltinTemplateDecl;
 class CharUnits;
 class ConceptDecl;
 class CXXABI;
 class CXXConstructorDecl;
 class CXXMethodDecl;
 class CXXRecordDecl;
 class DiagnosticsEngine;
 class ParentMapContext;
 class DynTypedNode;
 class DynTypedNodeList;
 class Expr;
-class FixedPointSemantics;
 class GlobalDecl;
 class MangleContext;
 class MangleNumberingContext;
 class MaterializeTemporaryExpr;
 class MemberSpecializationInfo;
 class Module;
 struct MSGuidDeclParts;
 class ObjCCategoryDecl;
if (!type.getTypePtr()->isObjCObjectPointerType() ||
       return type;
     Qualifiers Qs = type.getQualifiers();
     Qs.removeObjCLifetime();
     return getQualifiedType(type.getUnqualifiedType(), Qs);
   }
 
   unsigned char getFixedPointScale(QualType Ty) const;
   unsigned char getFixedPointIBits(QualType Ty) const;
-  FixedPointSemantics getFixedPointSemantics(QualType Ty) const;
-  APFixedPoint getFixedPointMax(QualType Ty) const;
-  APFixedPoint getFixedPointMin(QualType Ty) const;
+  llvm::FixedPointSemantics getFixedPointSemantics(QualType Ty) const;
+  llvm::APFixedPoint getFixedPointMax(QualType Ty) const;
+  llvm::APFixedPoint getFixedPointMin(QualType Ty) const;
 
   DeclarationNameInfo getNameForTemplate(TemplateName Name,
                                          SourceLocation NameLoc) const;
 
   TemplateName getOverloadedTemplateName(UnresolvedSetIterator Begin,
                                          UnresolvedSetIterator End) const;
   TemplateName getAssumedTemplateName(DeclarationName Name) const;
 

clang/include/clang/AST/Expr.h

 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclAccessPair.h"
 #include "clang/AST/DependenceFlags.h"
 #include "clang/AST/OperationKinds.h"
 #include "clang/AST/Stmt.h"
 #include "clang/AST/TemplateBase.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/CharInfo.h"
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/SyncScope.h"
 #include "clang/Basic/TypeTraits.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator.h"

clang/include/clang/AST/OptionalDiagnostic.h

if (Diag) {
       precision = (precision * 59 + 195) / 196;
       SmallVector<char, 32> Buffer;
       F.toString(Buffer, precision);
       *Diag << StringRef(Buffer.data(), Buffer.size());
     }
     return *this;
   }
 
-  OptionalDiagnostic &operator<<(const APFixedPoint &FX) {
+  OptionalDiagnostic &operator<<(const llvm::APFixedPoint &FX) {
     if (Diag) {
       SmallVector<char, 32> Buffer;
       FX.toString(Buffer);
       *Diag << StringRef(Buffer.data(), Buffer.size());
     }
     return *this;
   }
 };
 
 } // namespace clang
 
 #endif

clang/lib/AST/ASTContext.cpp

 #include "clang/AST/Type.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/UnresolvedSet.h"
 #include "clang/AST/VTableBuilder.h"
 #include "clang/Basic/AddressSpaces.h"
 #include "clang/Basic/Builtins.h"
 #include "clang/Basic/CommentOptions.h"
 #include "clang/Basic/ExceptionSpecificationType.h"
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Linkage.h"
 #include "clang/Basic/Module.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/SanitizerBlacklist.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TargetCXXABI.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/XRayLists.h"
+#include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/FoldingSet.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
switch (Ty->castAs<BuiltinType>()->getKind()) {
     case BuiltinType::UFract:
     case BuiltinType::SatUFract:
     case BuiltinType::ULongFract:
     case BuiltinType::SatULongFract:
       return 0;
   }
 }
 
-FixedPointSemantics ASTContext::getFixedPointSemantics(QualType Ty) const {
+llvm::FixedPointSemantics
+ASTContext::getFixedPointSemantics(QualType Ty) const {
   assert((Ty->isFixedPointType() || Ty->isIntegerType()) &&
          "Can only get the fixed point semantics for a "
          "fixed point or integer type.");
   if (Ty->isIntegerType())
-    return FixedPointSemantics::GetIntegerSemantics(getIntWidth(Ty),
-                                                    Ty->isSignedIntegerType());
+    return llvm::FixedPointSemantics::GetIntegerSemantics(
+        getIntWidth(Ty), Ty->isSignedIntegerType());
 
   bool isSigned = Ty->isSignedFixedPointType();
-  return FixedPointSemantics(
+  return llvm::FixedPointSemantics(
       static_cast<unsigned>(getTypeSize(Ty)), getFixedPointScale(Ty), isSigned,
       Ty->isSaturatedFixedPointType(),
       !isSigned && getTargetInfo().doUnsignedFixedPointTypesHavePadding());
 }
 
-APFixedPoint ASTContext::getFixedPointMax(QualType Ty) const {
+llvm::APFixedPoint ASTContext::getFixedPointMax(QualType Ty) const {
   assert(Ty->isFixedPointType());
-  return APFixedPoint::getMax(getFixedPointSemantics(Ty));
+  return llvm::APFixedPoint::getMax(getFixedPointSemantics(Ty));
 }
 
-APFixedPoint ASTContext::getFixedPointMin(QualType Ty) const {
+llvm::APFixedPoint ASTContext::getFixedPointMin(QualType Ty) const {
   assert(Ty->isFixedPointType());
-  return APFixedPoint::getMin(getFixedPointSemantics(Ty));
+  return llvm::APFixedPoint::getMin(getFixedPointSemantics(Ty));
 }
 
 QualType ASTContext::getCorrespondingSignedFixedPointType(QualType Ty) const {
   assert(Ty->isUnsignedFixedPointType() &&
          "Expected unsigned fixed point type");
 
   switch (Ty->castAs<BuiltinType>()->getKind()) {
   case BuiltinType::UShortAccum:

clang/lib/AST/ExprConstant.cpp

 #include "clang/AST/CurrentSourceLocExprScope.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/OSLog.h"
 #include "clang/AST/OptionalDiagnostic.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/Builtins.h"
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallBitVector.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/SaveAndRestore.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstring>
 #include <functional>
 
 #define DEBUG_TYPE "exprconstant"
 
 using namespace clang;
+using llvm::APFixedPoint;
 using llvm::APInt;
 using llvm::APSInt;
 using llvm::APFloat;
+using llvm::FixedPointSemantics;
 using llvm::Optional;
 
 namespace {
   struct LValue;
   class CallStackFrame;
   class EvalInfo;
 
   using SourceLocExprScopeGuard =

clang/lib/AST/Type.cpp

 }
 
 CXXRecordDecl *MemberPointerType::getMostRecentCXXRecordDecl() const {
   return getClass()->getAsCXXRecordDecl()->getMostRecentNonInjectedDecl();
 }
 
 void clang::FixedPointValueToString(SmallVectorImpl<char> &Str,
                                     llvm::APSInt Val, unsigned Scale) {
-  FixedPointSemantics FXSema(Val.getBitWidth(), Scale, Val.isSigned(),
+  llvm::FixedPointSemantics FXSema(Val.getBitWidth(), Scale, Val.isSigned(),
                                    /*IsSaturated=*/false,
                                    /*HasUnsignedPadding=*/false);
-  APFixedPoint(Val, FXSema).toString(Str);
+  llvm::APFixedPoint(Val, FXSema).toString(Str);
 }
 
 AutoType::AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
                    TypeDependence ExtraDependence,
                    ConceptDecl *TypeConstraintConcept,
                    ArrayRef<TemplateArgument> TypeConstraintArgs)
     : DeducedType(Auto, DeducedAsType, ExtraDependence) {
   AutoTypeBits.Keyword = (unsigned)Keyword;

clang/lib/Basic/CMakeLists.txt

add_clang_library(clangBasic
   CodeGenOptions.cpp
   Cuda.cpp
   Diagnostic.cpp
   DiagnosticIDs.cpp
   DiagnosticOptions.cpp
   ExpressionTraits.cpp
   FileManager.cpp
   FileSystemStatCache.cpp
-  FixedPoint.cpp
   IdentifierTable.cpp
   LangOptions.cpp
   LangStandards.cpp
   Module.cpp
   ObjCRuntime.cpp
   OpenMPKinds.cpp
   OperatorPrecedence.cpp
   SanitizerBlacklist.cpp

clang/lib/CodeGen/CGExprScalar.cpp

 #include "TargetInfo.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/Basic/CodeGenOptions.h"
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/TargetInfo.h"
+#include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/IR/CFG.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GetElementPtrTypeIterator.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/Intrinsics.h"
public:
   EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy,
                        SourceLocation Loc,
                        ScalarConversionOpts Opts = ScalarConversionOpts());
 
   /// Convert between either a fixed point and other fixed point or fixed point
   /// and an integer.
   Value *EmitFixedPointConversion(Value *Src, QualType SrcTy, QualType DstTy,
                                   SourceLocation Loc);
-  Value *EmitFixedPointConversion(Value *Src, FixedPointSemantics &SrcFixedSema,
-                                  FixedPointSemantics &DstFixedSema,
+  Value *EmitFixedPointConversion(Value *Src,
+                                  llvm::FixedPointSemantics &SrcFixedSema,
+                                  llvm::FixedPointSemantics &DstFixedSema,
                                   SourceLocation Loc,
                                   bool DstIsInteger = false);
 
   /// Emit a conversion from the specified complex type to the specified
   /// destination type, where the destination type is an LLVM scalar type.
   Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
                                        QualType SrcTy, QualType DstTy,
                                        SourceLocation Loc);
EmitIntegerSignChangeCheck(Src, NoncanonicalSrcType, Res,
                                NoncanonicalDstType, Loc);
 
   return Res;
 }
 
 Value *ScalarExprEmitter::EmitFixedPointConversion(Value *Src, QualType SrcTy,
                                                    QualType DstTy,
                                                    SourceLocation Loc) {
-  FixedPointSemantics SrcFPSema =
-      CGF.getContext().getFixedPointSemantics(SrcTy);
-  FixedPointSemantics DstFPSema =
-      CGF.getContext().getFixedPointSemantics(DstTy);
+  auto SrcFPSema = CGF.getContext().getFixedPointSemantics(SrcTy);
+  auto DstFPSema = CGF.getContext().getFixedPointSemantics(DstTy);
   return EmitFixedPointConversion(Src, SrcFPSema, DstFPSema, Loc,
                                   DstTy->isIntegerType());
 }
 
 Value *ScalarExprEmitter::EmitFixedPointConversion(
-    Value *Src, FixedPointSemantics &SrcFPSema, FixedPointSemantics &DstFPSema,
+    Value *Src, llvm::FixedPointSemantics &SrcFPSema,
+    llvm::FixedPointSemantics &DstFPSema,
     SourceLocation Loc, bool DstIsInteger) {
+  using llvm::APFixedPoint;
   using llvm::APInt;
   using llvm::ConstantInt;
   using llvm::Value;
 
   unsigned SrcWidth = SrcFPSema.getWidth();
   unsigned DstWidth = DstFPSema.getWidth();
   unsigned SrcScale = SrcFPSema.getScale();
   unsigned DstScale = DstFPSema.getScale();
// Fixed-point types.
     // since -1 is guaranteed to be representable.
     if (type->isSignedFixedPointType()) {
       Info.Opcode = isInc ? BO_Sub : BO_Add;
       Info.RHS = Builder.CreateNeg(Info.RHS);
     }
     // Now, convert from our invented integer literal to the type of the unary
     // op. This will upscale and saturate if necessary. This value can become
     // undef in some cases.
-    FixedPointSemantics SrcSema =
-        FixedPointSemantics::GetIntegerSemantics(value->getType()
-                                                      ->getScalarSizeInBits(),
-                                                 /*IsSigned=*/true);
-    FixedPointSemantics DstSema =
-        CGF.getContext().getFixedPointSemantics(Info.Ty);
+    auto SrcSema =
+        llvm::FixedPointSemantics::GetIntegerSemantics(
+            value->getType()->getScalarSizeInBits(), /*IsSigned=*/true);
+    auto DstSema = CGF.getContext().getFixedPointSemantics(Info.Ty);
     Info.RHS = EmitFixedPointConversion(Info.RHS, SrcSema, DstSema,
                                         E->getExprLoc());
     value = EmitFixedPointBinOp(Info);
 
   // Objective-C pointer types.
   } else {
     const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
     value = CGF.EmitCastToVoidPtr(value);

clang/lib/Sema/SemaChecking.cpp

static void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
   }
 
   // Valid casts involving fixed point types should be accounted for here.
   if (Source->isFixedPointType()) {
     if (Target->isUnsaturatedFixedPointType()) {
       Expr::EvalResult Result;
       if (E->EvaluateAsFixedPoint(Result, S.Context, Expr::SE_AllowSideEffects,
                                   S.isConstantEvaluated())) {
-        APFixedPoint Value = Result.Val.getFixedPoint();
-        APFixedPoint MaxVal = S.Context.getFixedPointMax(T);
-        APFixedPoint MinVal = S.Context.getFixedPointMin(T);
+        llvm::APFixedPoint Value = Result.Val.getFixedPoint();
+        llvm::APFixedPoint MaxVal = S.Context.getFixedPointMax(T);
+        llvm::APFixedPoint MinVal = S.Context.getFixedPointMin(T);
         if (Value > MaxVal || Value < MinVal) {
           S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                 S.PDiag(diag::warn_impcast_fixed_point_range)
                                     << Value.toString() << T
                                     << E->getSourceRange()
                                     << clang::SourceRange(CC));
           return;
         }
       }
     } else if (Target->isIntegerType()) {
       Expr::EvalResult Result;
       if (!S.isConstantEvaluated() &&
           E->EvaluateAsFixedPoint(Result, S.Context,
                                   Expr::SE_AllowSideEffects)) {
-        APFixedPoint FXResult = Result.Val.getFixedPoint();
+        llvm::APFixedPoint FXResult = Result.Val.getFixedPoint();
 
         bool Overflowed;
         llvm::APSInt IntResult = FXResult.convertToInt(
             S.Context.getIntWidth(T),
             Target->isSignedIntegerOrEnumerationType(), &Overflowed);
 
         if (Overflowed) {
           S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                 S.PDiag(diag::warn_impcast_fixed_point_range)
                                     << FXResult.toString() << T
                                     << E->getSourceRange()
                                     << clang::SourceRange(CC));
           return;
         }
       }
     }
   } else if (Target->isUnsaturatedFixedPointType()) {
     if (Source->isIntegerType()) {
       Expr::EvalResult Result;
       if (!S.isConstantEvaluated() &&
           E->EvaluateAsInt(Result, S.Context, Expr::SE_AllowSideEffects)) {
         llvm::APSInt Value = Result.Val.getInt();
 
         bool Overflowed;
-        APFixedPoint IntResult = APFixedPoint::getFromIntValue(
+        llvm::APFixedPoint IntResult = llvm::APFixedPoint::getFromIntValue(
             Value, S.Context.getFixedPointSemantics(T), &Overflowed);
 
         if (Overflowed) {
           S.DiagRuntimeBehavior(E->getExprLoc(), E,
                                 S.PDiag(diag::warn_impcast_fixed_point_range)
                                     << Value.toString(/*Radix=*/10) << T
                                     << E->getSourceRange()
                                     << clang::SourceRange(CC));

clang/lib/Sema/SemaExpr.cpp

 #include "clang/AST/EvaluatedExprVisitor.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/ExprObjC.h"
 #include "clang/AST/ExprOpenMP.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/Builtins.h"
-#include "clang/Basic/FixedPoint.h"
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Lex/LiteralSupport.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Sema/AnalysisBasedWarnings.h"
 #include "clang/Sema/DeclSpec.h"
 #include "clang/Sema/DelayedDiagnostic.h"
if (Right.isNegative()) {
     return;
   }
 
   QualType LHSExprType = LHS.get()->getType();
   uint64_t LeftSize = S.Context.getTypeSize(LHSExprType);
   if (LHSExprType->isExtIntType())
     LeftSize = S.Context.getIntWidth(LHSExprType);
   else if (LHSExprType->isFixedPointType()) {
-    FixedPointSemantics FXSema = S.Context.getFixedPointSemantics(LHSExprType);
+    auto FXSema = S.Context.getFixedPointSemantics(LHSExprType);
     LeftSize = FXSema.getWidth() - (unsigned)FXSema.hasUnsignedPadding();
   }
   llvm::APInt LeftBits(Right.getBitWidth(), LeftSize);
   if (Right.uge(LeftBits)) {
     S.DiagRuntimeBehavior(Loc, RHS.get(),
                           S.PDiag(diag::warn_shift_gt_typewidth)
                             << RHS.get()->getSourceRange());
     return;

clang/lib/Serialization/ASTReader.cpp

 SourceRange
 ASTReader::ReadSourceRange(ModuleFile &F, const RecordData &Record,
                            unsigned &Idx) {
   SourceLocation beg = ReadSourceLocation(F, Record, Idx);
   SourceLocation end = ReadSourceLocation(F, Record, Idx);
   return SourceRange(beg, end);
 }
 
-static FixedPointSemantics
+static llvm::FixedPointSemantics
 ReadFixedPointSemantics(const SmallVectorImpl<uint64_t> &Record,
                         unsigned &Idx) {
   unsigned Width = Record[Idx++];
   unsigned Scale = Record[Idx++];
   uint64_t Tmp = Record[Idx++];
   bool IsSigned = Tmp & 0x1;
   bool IsSaturated = Tmp & 0x2;
   bool HasUnsignedPadding = Tmp & 0x4;
-  return FixedPointSemantics(Width, Scale, IsSigned, IsSaturated,
+  return llvm::FixedPointSemantics(Width, Scale, IsSigned, IsSaturated,
                                    HasUnsignedPadding);
 }
 
 static const llvm::fltSemantics &
 readAPFloatSemantics(ASTRecordReader &reader) {
   return llvm::APFloatBase::EnumToSemantics(
     static_cast<llvm::APFloatBase::Semantics>(reader.readInt()));
 }
 
 APValue ASTRecordReader::readAPValue() {
   unsigned Kind = readInt();
   switch ((APValue::ValueKind) Kind) {
   case APValue::None:
     return APValue();
   case APValue::Indeterminate:
     return APValue::IndeterminateValue();
   case APValue::Int:
     return APValue(readAPSInt());
   case APValue::Float: {
     const llvm::fltSemantics &FloatSema = readAPFloatSemantics(*this);
     return APValue(readAPFloat(FloatSema));
   }
   case APValue::FixedPoint: {
-    FixedPointSemantics FPSema = ReadFixedPointSemantics(Record, Idx);
-    return APValue(APFixedPoint(readAPInt(), FPSema));
+    llvm::FixedPointSemantics FPSema = ReadFixedPointSemantics(Record, Idx);
+    return APValue(llvm::APFixedPoint(readAPInt(), FPSema));
   }
   case APValue::ComplexInt: {
     llvm::APSInt First = readAPSInt();
     return APValue(std::move(First), readAPSInt());
   }
   case APValue::ComplexFloat: {
     const llvm::fltSemantics &FloatSema1 = readAPFloatSemantics(*this);
     llvm::APFloat First = readAPFloat(FloatSema1);

clang/lib/Serialization/ASTWriter.cpp

void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record) {
   AddSourceLocation(Range.getEnd(), Record);
 }
 
 void ASTRecordWriter::AddAPFloat(const llvm::APFloat &Value) {
   AddAPInt(Value.bitcastToAPInt());
 }
 
 static void WriteFixedPointSemantics(ASTRecordWriter &Record,
-                                     FixedPointSemantics FPSema) {
+                                     llvm::FixedPointSemantics FPSema) {
   Record.push_back(FPSema.getWidth());
   Record.push_back(FPSema.getScale());
   Record.push_back(FPSema.isSigned() | FPSema.isSaturated() << 1 |
                    FPSema.hasUnsignedPadding() << 2);
 }
 
 void ASTRecordWriter::AddAPValue(const APValue &Value) {
   APValue::ValueKind Kind = Value.getKind();

clang/unittests/Basic/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
   Support
   )
 
 add_clang_unittest(BasicTests
   CharInfoTest.cpp
   DiagnosticTest.cpp
   FileManagerTest.cpp
-  FixedPointTest.cpp
   SourceManagerTest.cpp
   )
 
 clang_target_link_libraries(BasicTests
   PRIVATE
   clangAST
   clangBasic
   clangLex
   )

llvm/include/llvm/ADT/APFixedPoint.h

-//===- FixedPoint.h - Fixed point constant handling -------------*- C++ -*-===//
+//===- APFixedPoint.h - Fixed point constant handling -----------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
 /// Defines the fixed point number interface.
 /// This is a class for abstracting various operations performed on fixed point
-/// types described in ISO/IEC JTC1 SC22 WG14 N1169 starting at clause 4.
+/// types.
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_BASIC_FIXEDPOINT_H
-#define LLVM_CLANG_BASIC_FIXEDPOINT_H
+#ifndef LLVM_ADT_APFIXEDPOINT_H
+#define LLVM_ADT_APFIXEDPOINT_H
 
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/raw_ostream.h"
 
-namespace clang {
-
-class ASTContext;
-class QualType;
+namespace llvm {
 
-/// The fixed point semantics work similarly to llvm::fltSemantics. The width
+/// The fixed point semantics work similarly to fltSemantics. The width
 /// specifies the whole bit width of the underlying scaled integer (with padding
 /// if any). The scale represents the number of fractional bits in this type.
 /// When HasUnsignedPadding is true and this type is unsigned, the first bit
 /// in the value this represents is treated as padding.
 class FixedPointSemantics {
 public:
   FixedPointSemantics(unsigned Width, unsigned Scale, bool IsSigned,
                       bool IsSaturated, bool HasUnsignedPadding)

 };
 
 /// The APFixedPoint class works similarly to APInt/APSInt in that it is a
 /// functional replacement for a scaled integer. It is meant to replicate the
 /// fixed point types proposed in ISO/IEC JTC1 SC22 WG14 N1169. The class carries
 /// info about the fixed point type's width, sign, scale, and saturation, and
 /// provides different operations that would normally be performed on fixed point
 /// types.
-///
-/// Semantically this does not represent any existing C type other than fixed
-/// point types and should eventually be moved to LLVM if fixed point types gain
-/// native IR support.
 class APFixedPoint {
 public:
-  APFixedPoint(const llvm::APInt &Val, const FixedPointSemantics &Sema)
+  APFixedPoint(const APInt &Val, const FixedPointSemantics &Sema)
       : Val(Val, !Sema.isSigned()), Sema(Sema) {
     assert(Val.getBitWidth() == Sema.getWidth() &&
            "The value should have a bit width that matches the Sema width");
   }
 
   APFixedPoint(uint64_t Val, const FixedPointSemantics &Sema)
-      : APFixedPoint(llvm::APInt(Sema.getWidth(), Val, Sema.isSigned()),
-                     Sema) {}
+      : APFixedPoint(APInt(Sema.getWidth(), Val, Sema.isSigned()), Sema) {}
 
   // Zero initialization.
   APFixedPoint(const FixedPointSemantics &Sema) : APFixedPoint(0, Sema) {}
 
-  llvm::APSInt getValue() const { return llvm::APSInt(Val, !Sema.isSigned()); }
+  APSInt getValue() const { return APSInt(Val, !Sema.isSigned()); }
   inline unsigned getWidth() const { return Sema.getWidth(); }
   inline unsigned getScale() const { return Sema.getScale(); }
   inline bool isSaturated() const { return Sema.isSaturated(); }
   inline bool isSigned() const { return Sema.isSigned(); }
   inline bool hasPadding() const { return Sema.hasUnsignedPadding(); }
   FixedPointSemantics getSemantics() const { return Sema; }
 
   bool getBoolValue() const { return Val.getBoolValue(); }
public:
   }
 
   /// Perform a unary negation (-X) on this fixed point type, taking into
   /// account saturation if applicable.
   APFixedPoint negate(bool *Overflow = nullptr) const;
 
   /// Return the integral part of this fixed point number, rounded towards
   /// zero. (-2.5k -> -2)
-  llvm::APSInt getIntPart() const {
+  APSInt getIntPart() const {
     if (Val < 0 && Val != -Val) // Cover the case when we have the min val
       return -(-Val >> getScale());
     else
       return Val >> getScale();
   }
 
   /// Return the integral part of this fixed point number, rounded towards
   /// zero. The value is stored into an APSInt with the provided width and sign.
   /// If the overflow parameter is provided, and the integral value is not able
   /// to be fully stored in the provided width and sign, the overflow parameter
   /// is set to true.
   ///
   /// If the overflow parameter is provided, set this value to true or false to
   /// indicate if this operation results in an overflow.
-  llvm::APSInt convertToInt(unsigned DstWidth, bool DstSign,
-                            bool *Overflow = nullptr) const;
+  APSInt convertToInt(unsigned DstWidth, bool DstSign,
 
-  void toString(llvm::SmallVectorImpl<char> &Str) const;
+  void toString(SmallVectorImpl<char> &Str) const;
   std::string toString() const {
-    llvm::SmallString<40> S;
+    SmallString<40> S;
     toString(S);
     return std::string(S.str());
   }
 
   // If LHS > RHS, return 1. If LHS == RHS, return 0. If LHS < RHS, return -1.
   int compare(const APFixedPoint &Other) const;
   bool operator==(const APFixedPoint &Other) const {
     return compare(Other) == 0;
public:
 
   static APFixedPoint getMax(const FixedPointSemantics &Sema);
   static APFixedPoint getMin(const FixedPointSemantics &Sema);
 
   /// Create an APFixedPoint with a value equal to that of the provided integer,
   /// and in the same semantics as the provided target semantics. If the value
   /// is not able to fit in the specified fixed point semantics, and the
   /// overflow parameter is provided, it is set to true.
-  static APFixedPoint getFromIntValue(const llvm::APSInt &Value,
+  static APFixedPoint getFromIntValue(const APSInt &Value,
                                       const FixedPointSemantics &DstFXSema,
                                       bool *Overflow = nullptr);
 
 private:
-  llvm::APSInt Val;
+  APSInt Val;
   FixedPointSemantics Sema;
 };
 
-inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
-                                     const APFixedPoint &FX) {
+inline raw_ostream &operator<<(raw_ostream &OS, const APFixedPoint &FX) {
   OS << FX.toString();
   return OS;
 }
 
-}  // namespace clang
+}  // namespace llvm
 
 #endif

llvm/lib/Support/APFixedPoint.cpp

-//===- FixedPoint.cpp - Fixed point constant handling -----------*- C++ -*-===//
+//===- APFixedPoint.cpp - Fixed point constant handling ---------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
 /// Defines the implementation for the fixed point number interface.
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Basic/FixedPoint.h"
+#include "llvm/ADT/APFixedPoint.h"
 
-namespace clang {
+namespace llvm {
 
 APFixedPoint APFixedPoint::convert(const FixedPointSemantics &DstSema,
                                    bool *Overflow) const {
-  llvm::APSInt NewVal = Val;
+  APSInt NewVal = Val;
   unsigned DstWidth = DstSema.getWidth();
   unsigned DstScale = DstSema.getScale();
   bool Upscaling = DstScale > getScale();
   if (Overflow)
     *Overflow = false;
 
   if (Upscaling) {
     NewVal = NewVal.extend(NewVal.getBitWidth() + DstScale - getScale());
     NewVal <<= (DstScale - getScale());
   } else {
     NewVal >>= (getScale() - DstScale);
   }
 
-  auto Mask = llvm::APInt::getBitsSetFrom(
+  auto Mask = APInt::getBitsSetFrom(
       NewVal.getBitWidth(),
       std::min(DstScale + DstSema.getIntegralBits(), NewVal.getBitWidth()));
-  llvm::APInt Masked(NewVal & Mask);
+  APInt Masked(NewVal & Mask);
 
   // Change in the bits above the sign
   if (!(Masked == Mask || Masked == 0)) {
     // Found overflow in the bits above the sign
     if (DstSema.isSaturated())
       NewVal = NewVal.isNegative() ? Mask : ~Mask;
     else if (Overflow)
       *Overflow = true;
APFixedPoint APFixedPoint::convert(const FixedPointSemantics &DstSema,
   }
 
   NewVal = NewVal.extOrTrunc(DstWidth);
   NewVal.setIsSigned(DstSema.isSigned());
   return APFixedPoint(NewVal, DstSema);
 }
 
 int APFixedPoint::compare(const APFixedPoint &Other) const {
-  llvm::APSInt ThisVal = getValue();
-  llvm::APSInt OtherVal = Other.getValue();
+  APSInt ThisVal = getValue();
+  APSInt OtherVal = Other.getValue();
   bool ThisSigned = Val.isSigned();
   bool OtherSigned = OtherVal.isSigned();
   unsigned OtherScale = Other.getScale();
   unsigned OtherWidth = OtherVal.getBitWidth();
 
   unsigned CommonWidth = std::max(Val.getBitWidth(), OtherWidth);
 
   // Prevent overflow in the event the widths are the same but the scales differ
else if (ThisVal.ult(OtherVal))
       return -1;
   }
 
   return 0;
 }
 
 APFixedPoint APFixedPoint::getMax(const FixedPointSemantics &Sema) {
   bool IsUnsigned = !Sema.isSigned();
-  auto Val = llvm::APSInt::getMaxValue(Sema.getWidth(), IsUnsigned);
+  auto Val = APSInt::getMaxValue(Sema.getWidth(), IsUnsigned);
   if (IsUnsigned && Sema.hasUnsignedPadding())
     Val = Val.lshr(1);
   return APFixedPoint(Val, Sema);
 }
 
 APFixedPoint APFixedPoint::getMin(const FixedPointSemantics &Sema) {
-  auto Val = llvm::APSInt::getMinValue(Sema.getWidth(), !Sema.isSigned());
+  auto Val = APSInt::getMinValue(Sema.getWidth(), !Sema.isSigned());
   return APFixedPoint(Val, Sema);
 }
 
 FixedPointSemantics FixedPointSemantics::getCommonSemantics(
     const FixedPointSemantics &Other) const {
   unsigned CommonScale = std::max(getScale(), Other.getScale());
   unsigned CommonWidth =
       std::max(getIntegralBits(), Other.getIntegralBits()) + CommonScale;
return FixedPointSemantics(CommonWidth, CommonScale, ResultIsSigned,
                              ResultIsSaturated, ResultHasUnsignedPadding);
 }
 
 APFixedPoint APFixedPoint::add(const APFixedPoint &Other,
                                bool *Overflow) const {
   auto CommonFXSema = Sema.getCommonSemantics(Other.getSemantics());
   APFixedPoint ConvertedThis = convert(CommonFXSema);
   APFixedPoint ConvertedOther = Other.convert(CommonFXSema);
-  llvm::APSInt ThisVal = ConvertedThis.getValue();
-  llvm::APSInt OtherVal = ConvertedOther.getValue();
+  APSInt ThisVal = ConvertedThis.getValue();
+  APSInt OtherVal = ConvertedOther.getValue();
   bool Overflowed = false;
 
-  llvm::APSInt Result;
+  APSInt Result;
   if (CommonFXSema.isSaturated()) {
     Result = CommonFXSema.isSigned() ? ThisVal.sadd_sat(OtherVal)
                                      : ThisVal.uadd_sat(OtherVal);
   } else {
     Result = ThisVal.isSigned() ? ThisVal.sadd_ov(OtherVal, Overflowed)
                                 : ThisVal.uadd_ov(OtherVal, Overflowed);
   }
 
   if (Overflow)
     *Overflow = Overflowed;
 
   return APFixedPoint(Result, CommonFXSema);
 }
 
 APFixedPoint APFixedPoint::sub(const APFixedPoint &Other,
                                bool *Overflow) const {
   auto CommonFXSema = Sema.getCommonSemantics(Other.getSemantics());
   APFixedPoint ConvertedThis = convert(CommonFXSema);
   APFixedPoint ConvertedOther = Other.convert(CommonFXSema);
-  llvm::APSInt ThisVal = ConvertedThis.getValue();
-  llvm::APSInt OtherVal = ConvertedOther.getValue();
+  APSInt ThisVal = ConvertedThis.getValue();
+  APSInt OtherVal = ConvertedOther.getValue();
   bool Overflowed = false;
 
-  llvm::APSInt Result;
+  APSInt Result;
   if (CommonFXSema.isSaturated()) {
     Result = CommonFXSema.isSigned() ? ThisVal.ssub_sat(OtherVal)
                                      : ThisVal.usub_sat(OtherVal);
   } else {
     Result = ThisVal.isSigned() ? ThisVal.ssub_ov(OtherVal, Overflowed)
                                 : ThisVal.usub_ov(OtherVal, Overflowed);
   }
 
   if (Overflow)
     *Overflow = Overflowed;
 
   return APFixedPoint(Result, CommonFXSema);
 }
 
 APFixedPoint APFixedPoint::mul(const APFixedPoint &Other,
                                bool *Overflow) const {
   auto CommonFXSema = Sema.getCommonSemantics(Other.getSemantics());
   APFixedPoint ConvertedThis = convert(CommonFXSema);
   APFixedPoint ConvertedOther = Other.convert(CommonFXSema);
-  llvm::APSInt ThisVal = ConvertedThis.getValue();
-  llvm::APSInt OtherVal = ConvertedOther.getValue();
+  APSInt ThisVal = ConvertedThis.getValue();
+  APSInt OtherVal = ConvertedOther.getValue();
   bool Overflowed = false;
 
   // Widen the LHS and RHS so we can perform a full multiplication.
   unsigned Wide = CommonFXSema.getWidth() * 2;
   if (CommonFXSema.isSigned()) {
     ThisVal = ThisVal.sextOrSelf(Wide);
     OtherVal = OtherVal.sextOrSelf(Wide);
   } else {
     ThisVal = ThisVal.zextOrSelf(Wide);
     OtherVal = OtherVal.zextOrSelf(Wide);
   }
 
   // Perform the full multiplication and downscale to get the same scale.
   //
   // Note that the right shifts here perform an implicit downwards rounding.
   // This rounding could discard bits that would technically place the result
   // outside the representable range. We interpret the spec as allowing us to
   // perform the rounding step first, avoiding the overflow case that would
   // arise.
-  llvm::APSInt Result;
+  APSInt Result;
   if (CommonFXSema.isSigned())
     Result = ThisVal.smul_ov(OtherVal, Overflowed)
                     .ashr(CommonFXSema.getScale());
   else
     Result = ThisVal.umul_ov(OtherVal, Overflowed)
                     .lshr(CommonFXSema.getScale());
   assert(!Overflowed && "Full multiplication cannot overflow!");
   Result.setIsSigned(CommonFXSema.isSigned());
 
   // If our result lies outside of the representative range of the common
   // semantic, we either have overflow or saturation.
-  llvm::APSInt Max = APFixedPoint::getMax(CommonFXSema).getValue()
-                                                       .extOrTrunc(Wide);
-  llvm::APSInt Min = APFixedPoint::getMin(CommonFXSema).getValue()
-                                                       .extOrTrunc(Wide);
+  APSInt Max = APFixedPoint::getMax(CommonFXSema).getValue()
+  APSInt Min = APFixedPoint::getMin(CommonFXSema).getValue()
   if (CommonFXSema.isSaturated()) {
     if (Result < Min)
       Result = Min;
     else if (Result > Max)
       Result = Max;
   } else
     Overflowed = Result < Min || Result > Max;
 
   if (Overflow)
     *Overflow = Overflowed;
 
   return APFixedPoint(Result.sextOrTrunc(CommonFXSema.getWidth()),
                       CommonFXSema);
 }
 
 APFixedPoint APFixedPoint::div(const APFixedPoint &Other,
                                bool *Overflow) const {
   auto CommonFXSema = Sema.getCommonSemantics(Other.getSemantics());
   APFixedPoint ConvertedThis = convert(CommonFXSema);
   APFixedPoint ConvertedOther = Other.convert(CommonFXSema);
-  llvm::APSInt ThisVal = ConvertedThis.getValue();
-  llvm::APSInt OtherVal = ConvertedOther.getValue();
+  APSInt ThisVal = ConvertedThis.getValue();
+  APSInt OtherVal = ConvertedOther.getValue();
   bool Overflowed = false;
 
   // Widen the LHS and RHS so we can perform a full division.
   unsigned Wide = CommonFXSema.getWidth() * 2;
   if (CommonFXSema.isSigned()) {
     ThisVal = ThisVal.sextOrSelf(Wide);
     OtherVal = OtherVal.sextOrSelf(Wide);
   } else {
     ThisVal = ThisVal.zextOrSelf(Wide);
     OtherVal = OtherVal.zextOrSelf(Wide);
   }
 
   // Upscale to compensate for the loss of precision from division, and
   // perform the full division.
   ThisVal = ThisVal.shl(CommonFXSema.getScale());
-  llvm::APSInt Result;
+  APSInt Result;
   if (CommonFXSema.isSigned()) {
-    llvm::APInt Rem;
-    llvm::APInt::sdivrem(ThisVal, OtherVal, Result, Rem);
+    APInt Rem;
+    APInt::sdivrem(ThisVal, OtherVal, Result, Rem);
     // If the quotient is negative and the remainder is nonzero, round
     // towards negative infinity by subtracting epsilon from the result.
     if (ThisVal.isNegative() != OtherVal.isNegative() && !Rem.isNullValue())
       Result = Result - 1;
   } else
     Result = ThisVal.udiv(OtherVal);
   Result.setIsSigned(CommonFXSema.isSigned());
 
   // If our result lies outside of the representative range of the common
   // semantic, we either have overflow or saturation.
-  llvm::APSInt Max = APFixedPoint::getMax(CommonFXSema).getValue()
-                                                       .extOrTrunc(Wide);
-  llvm::APSInt Min = APFixedPoint::getMin(CommonFXSema).getValue()
-                                                       .extOrTrunc(Wide);
+  APSInt Max = APFixedPoint::getMax(CommonFXSema).getValue()
+  APSInt Min = APFixedPoint::getMin(CommonFXSema).getValue()
   if (CommonFXSema.isSaturated()) {
     if (Result < Min)
       Result = Min;
     else if (Result > Max)
       Result = Max;
   } else
     Overflowed = Result < Min || Result > Max;
 
   if (Overflow)
     *Overflow = Overflowed;
 
   return APFixedPoint(Result.sextOrTrunc(CommonFXSema.getWidth()),
                       CommonFXSema);
 }
 
 APFixedPoint APFixedPoint::shl(unsigned Amt, bool *Overflow) const {
-  llvm::APSInt ThisVal = Val;
+  APSInt ThisVal = Val;
   bool Overflowed = false;
 
   // Widen the LHS.
   unsigned Wide = Sema.getWidth() * 2;
   if (Sema.isSigned())
     ThisVal = ThisVal.sextOrSelf(Wide);
   else
     ThisVal = ThisVal.zextOrSelf(Wide);
 
   // Clamp the shift amount at the original width, and perform the shift.
   Amt = std::min(Amt, ThisVal.getBitWidth());
-  llvm::APSInt Result = ThisVal << Amt;
+  APSInt Result = ThisVal << Amt;
   Result.setIsSigned(Sema.isSigned());
 
   // If our result lies outside of the representative range of the
   // semantic, we either have overflow or saturation.
-  llvm::APSInt Max = APFixedPoint::getMax(Sema).getValue().extOrTrunc(Wide);
-  llvm::APSInt Min = APFixedPoint::getMin(Sema).getValue().extOrTrunc(Wide);
+  APSInt Max = APFixedPoint::getMax(Sema).getValue().extOrTrunc(Wide);
+  APSInt Min = APFixedPoint::getMin(Sema).getValue().extOrTrunc(Wide);
   if (Sema.isSaturated()) {
     if (Result < Min)
       Result = Min;
     else if (Result > Max)
       Result = Max;
   } else
     Overflowed = Result < Min || Result > Max;
 
   if (Overflow)
     *Overflow = Overflowed;
 
   return APFixedPoint(Result.sextOrTrunc(Sema.getWidth()), Sema);
 }
 
-void APFixedPoint::toString(llvm::SmallVectorImpl<char> &Str) const {
-  llvm::APSInt Val = getValue();
+void APFixedPoint::toString(SmallVectorImpl<char> &Str) const {
+  APSInt Val = getValue();
   unsigned Scale = getScale();
 
   if (Val.isSigned() && Val.isNegative() && Val != -Val) {
     Val = -Val;
     Str.push_back('-');
   }
 
-  llvm::APSInt IntPart = Val >> Scale;
+  APSInt IntPart = Val >> Scale;
 
   // Add 4 digits to hold the value after multiplying 10 (the radix)
   unsigned Width = Val.getBitWidth() + 4;
-  llvm::APInt FractPart = Val.zextOrTrunc(Scale).zext(Width);
-  llvm::APInt FractPartMask = llvm::APInt::getAllOnesValue(Scale).zext(Width);
-  llvm::APInt RadixInt = llvm::APInt(Width, 10);
+  APInt FractPart = Val.zextOrTrunc(Scale).zext(Width);
+  APInt FractPartMask = APInt::getAllOnesValue(Scale).zext(Width);
+  APInt RadixInt = APInt(Width, 10);
 
   IntPart.toString(Str, /*Radix=*/10);
   Str.push_back('.');
   do {
     (FractPart * RadixInt)
         .lshr(Scale)
         .toString(Str, /*Radix=*/10, Val.isSigned());
     FractPart = (FractPart * RadixInt) & FractPartMask;
if (Overflow)
     *Overflow = false;
 
   if (isSigned())
     return Val.isMinSignedValue() ? getMax(Sema) : APFixedPoint(-Val, Sema);
   else
     return APFixedPoint(Sema);
 }
 
-llvm::APSInt APFixedPoint::convertToInt(unsigned DstWidth, bool DstSign,
-                                        bool *Overflow) const {
-  llvm::APSInt Result = getIntPart();
+APSInt APFixedPoint::convertToInt(unsigned DstWidth, bool DstSign,
+  APSInt Result = getIntPart();
   unsigned SrcWidth = getWidth();
 
-  llvm::APSInt DstMin = llvm::APSInt::getMinValue(DstWidth, !DstSign);
-  llvm::APSInt DstMax = llvm::APSInt::getMaxValue(DstWidth, !DstSign);
+  APSInt DstMin = APSInt::getMinValue(DstWidth, !DstSign);
+  APSInt DstMax = APSInt::getMaxValue(DstWidth, !DstSign);
 
   if (SrcWidth < DstWidth) {
     Result = Result.extend(DstWidth);
   } else if (SrcWidth > DstWidth) {
     DstMin = DstMin.extend(SrcWidth);
     DstMax = DstMax.extend(SrcWidth);
   }
 
   if (Overflow) {
     if (Result.isSigned() && !DstSign) {
       *Overflow = Result.isNegative() || Result.ugt(DstMax);
     } else if (Result.isUnsigned() && DstSign) {
       *Overflow = Result.ugt(DstMax);
     } else {
       *Overflow = Result < DstMin || Result > DstMax;
     }
   }
 
   Result.setIsSigned(DstSign);
   return Result.extOrTrunc(DstWidth);
 }
 
-APFixedPoint APFixedPoint::getFromIntValue(const llvm::APSInt &Value,
+APFixedPoint APFixedPoint::getFromIntValue(const APSInt &Value,
                                            const FixedPointSemantics &DstFXSema,
                                            bool *Overflow) {
   FixedPointSemantics IntFXSema = FixedPointSemantics::GetIntegerSemantics(
       Value.getBitWidth(), Value.isSigned());
   return APFixedPoint(Value, IntFXSema).convert(DstFXSema, Overflow);
 }
 
 }  // namespace clang

llvm/lib/Support/CMakeLists.txt

else()
   set(Z3_LINK_FILES "")
 endif()
 
 add_llvm_component_library(LLVMSupport
   AArch64TargetParser.cpp
   ABIBreak.cpp
   ARMTargetParser.cpp
   AMDGPUMetadata.cpp
+  APFixedPoint.cpp
   APFloat.cpp
   APInt.cpp
   APSInt.cpp
   ARMBuildAttrs.cpp
   ARMAttributeParser.cpp
   ARMWinEH.cpp
   Allocator.cpp
   BinaryStreamError.cpp

llvm/unittests/ADT/APFixedPointTest.cpp

-//===- unittests/Basic/FixedPointTest.cpp -- fixed point number tests -----===//
+//===- unittests/ADT/FixedPointTest.cpp -- fixed point number tests -----===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Basic/FixedPoint.h"
+#include "llvm/ADT/APFixedPoint.h"
 #include "llvm/ADT/APSInt.h"
 #include "gtest/gtest.h"
 
-using clang::APFixedPoint;
-using clang::FixedPointSemantics;
+using llvm::APFixedPoint;
+using llvm::FixedPointSemantics;
 using llvm::APInt;
 using llvm::APSInt;
 
 namespace {
 
 FixedPointSemantics Saturated(FixedPointSemantics Sema) {
   Sema.setSaturated(true);
   return Sema;

llvm/unittests/ADT/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
   Support
   )
 
 add_llvm_unittest(ADTTests
   AnyTest.cpp
+  APFixedPointTest.cpp
   APFloatTest.cpp
   APIntTest.cpp
   APSIntTest.cpp
   ArrayRefTest.cpp
   BitFieldsTest.cpp
   BitmaskEnumTest.cpp
   BitVectorTest.cpp
   BreadthFirstIteratorTest.cpp