mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-21 03:32:21 +00:00
Rewrite ConstantFoldCastInstruction so that it doesn't use any of the
ConstRules. Remove the casting rules from ConstRules and subclasses. This cleans up ConstantFolding significantly. Passes all tests. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32671 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
parent
0b985dc84a
commit
390437fc6d
@ -54,21 +54,6 @@ namespace {
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virtual Constant *lessthan(const Constant *V1, const Constant *V2) const =0;
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virtual Constant *equalto(const Constant *V1, const Constant *V2) const = 0;
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// Casting operators.
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virtual Constant *castToBool (const Constant *V) const = 0;
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virtual Constant *castToSByte (const Constant *V) const = 0;
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virtual Constant *castToUByte (const Constant *V) const = 0;
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virtual Constant *castToShort (const Constant *V) const = 0;
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virtual Constant *castToUShort(const Constant *V) const = 0;
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virtual Constant *castToInt (const Constant *V) const = 0;
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virtual Constant *castToUInt (const Constant *V) const = 0;
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virtual Constant *castToLong (const Constant *V) const = 0;
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virtual Constant *castToULong (const Constant *V) const = 0;
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virtual Constant *castToFloat (const Constant *V) const = 0;
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virtual Constant *castToDouble(const Constant *V) const = 0;
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virtual Constant *castToPointer(const Constant *V,
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const PointerType *Ty) const = 0;
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// ConstRules::get - Return an instance of ConstRules for the specified
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// constant operands.
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//
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@ -154,44 +139,6 @@ class VISIBILITY_HIDDEN TemplateRules : public ConstRules {
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return SubClassName::EqualTo((const ArgType *)V1, (const ArgType *)V2);
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}
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// Casting operators. ick
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virtual Constant *castToBool(const Constant *V) const {
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return SubClassName::CastToBool((const ArgType*)V);
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}
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virtual Constant *castToSByte(const Constant *V) const {
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return SubClassName::CastToSByte((const ArgType*)V);
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}
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virtual Constant *castToUByte(const Constant *V) const {
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return SubClassName::CastToUByte((const ArgType*)V);
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}
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virtual Constant *castToShort(const Constant *V) const {
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return SubClassName::CastToShort((const ArgType*)V);
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}
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virtual Constant *castToUShort(const Constant *V) const {
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return SubClassName::CastToUShort((const ArgType*)V);
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}
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virtual Constant *castToInt(const Constant *V) const {
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return SubClassName::CastToInt((const ArgType*)V);
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}
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virtual Constant *castToUInt(const Constant *V) const {
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return SubClassName::CastToUInt((const ArgType*)V);
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}
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virtual Constant *castToLong(const Constant *V) const {
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return SubClassName::CastToLong((const ArgType*)V);
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}
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virtual Constant *castToULong(const Constant *V) const {
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return SubClassName::CastToULong((const ArgType*)V);
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}
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virtual Constant *castToFloat(const Constant *V) const {
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return SubClassName::CastToFloat((const ArgType*)V);
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}
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virtual Constant *castToDouble(const Constant *V) const {
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return SubClassName::CastToDouble((const ArgType*)V);
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}
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virtual Constant *castToPointer(const Constant *V,
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const PointerType *Ty) const {
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return SubClassName::CastToPointer((const ArgType*)V, Ty);
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}
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//===--------------------------------------------------------------------===//
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// Default "noop" implementations
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@ -219,21 +166,6 @@ class VISIBILITY_HIDDEN TemplateRules : public ConstRules {
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return 0;
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}
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// Casting operators. ick
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static Constant *CastToBool (const Constant *V) { return 0; }
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static Constant *CastToSByte (const Constant *V) { return 0; }
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static Constant *CastToUByte (const Constant *V) { return 0; }
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static Constant *CastToShort (const Constant *V) { return 0; }
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static Constant *CastToUShort(const Constant *V) { return 0; }
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static Constant *CastToInt (const Constant *V) { return 0; }
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static Constant *CastToUInt (const Constant *V) { return 0; }
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static Constant *CastToLong (const Constant *V) { return 0; }
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static Constant *CastToULong (const Constant *V) { return 0; }
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static Constant *CastToFloat (const Constant *V) { return 0; }
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static Constant *CastToDouble(const Constant *V) { return 0; }
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static Constant *CastToPointer(const Constant *,
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const PointerType *) {return 0;}
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public:
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virtual ~TemplateRules() {}
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};
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@ -287,25 +219,6 @@ struct VISIBILITY_HIDDEN BoolRules
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static Constant *Xor(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() ^ V2->getValue());
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}
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// Casting operators. ick
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#define DEF_CAST(TYPE, CLASS, CTYPE) \
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static Constant *CastTo##TYPE (const ConstantBool *V) { \
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return CLASS::get(Type::TYPE##Ty, (CTYPE)(bool)V->getValue()); \
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}
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DEF_CAST(Bool , ConstantBool, bool)
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DEF_CAST(SByte , ConstantInt, signed char)
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DEF_CAST(UByte , ConstantInt, unsigned char)
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DEF_CAST(Short , ConstantInt, signed short)
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DEF_CAST(UShort, ConstantInt, unsigned short)
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DEF_CAST(Int , ConstantInt, signed int)
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DEF_CAST(UInt , ConstantInt, unsigned int)
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DEF_CAST(Long , ConstantInt, int64_t)
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DEF_CAST(ULong , ConstantInt, uint64_t)
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DEF_CAST(Float , ConstantFP , float)
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DEF_CAST(Double, ConstantFP , double)
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#undef DEF_CAST
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};
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} // end anonymous namespace
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@ -323,44 +236,6 @@ struct VISIBILITY_HIDDEN NullPointerRules
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static Constant *EqualTo(const Constant *V1, const Constant *V2) {
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return ConstantBool::getTrue(); // Null pointers are always equal
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}
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static Constant *CastToBool(const Constant *V) {
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return ConstantBool::getFalse();
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}
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static Constant *CastToSByte (const Constant *V) {
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return ConstantInt::get(Type::SByteTy, 0);
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}
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static Constant *CastToUByte (const Constant *V) {
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return ConstantInt::get(Type::UByteTy, 0);
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}
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static Constant *CastToShort (const Constant *V) {
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return ConstantInt::get(Type::ShortTy, 0);
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}
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static Constant *CastToUShort(const Constant *V) {
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return ConstantInt::get(Type::UShortTy, 0);
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}
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static Constant *CastToInt (const Constant *V) {
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return ConstantInt::get(Type::IntTy, 0);
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}
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static Constant *CastToUInt (const Constant *V) {
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return ConstantInt::get(Type::UIntTy, 0);
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}
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static Constant *CastToLong (const Constant *V) {
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return ConstantInt::get(Type::LongTy, 0);
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}
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static Constant *CastToULong (const Constant *V) {
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return ConstantInt::get(Type::ULongTy, 0);
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}
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static Constant *CastToFloat (const Constant *V) {
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return ConstantFP::get(Type::FloatTy, 0);
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}
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static Constant *CastToDouble(const Constant *V) {
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return ConstantFP::get(Type::DoubleTy, 0);
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}
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static Constant *CastToPointer(const ConstantPointerNull *V,
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const PointerType *PTy) {
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return ConstantPointerNull::get(PTy);
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}
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};
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} // end anonymous namespace
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@ -497,32 +372,6 @@ struct VISIBILITY_HIDDEN DirectIntRules
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return ConstantBool::get(R);
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}
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static Constant *CastToPointer(const ConstantInt *V,
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const PointerType *PTy) {
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if (V->isNullValue()) // Is it a FP or Integral null value?
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return ConstantPointerNull::get(PTy);
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return 0; // Can't const prop other types of pointers
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}
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// Casting operators. ick
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#define DEF_CAST(TYPE, CLASS, CTYPE) \
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static Constant *CastTo##TYPE (const ConstantInt *V) { \
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return CLASS::get(Type::TYPE##Ty, (CTYPE)((BuiltinType)V->getZExtValue()));\
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}
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DEF_CAST(Bool , ConstantBool, bool)
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DEF_CAST(SByte , ConstantInt, signed char)
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DEF_CAST(UByte , ConstantInt, unsigned char)
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DEF_CAST(Short , ConstantInt, signed short)
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DEF_CAST(UShort, ConstantInt, unsigned short)
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DEF_CAST(Int , ConstantInt, signed int)
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DEF_CAST(UInt , ConstantInt, unsigned int)
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DEF_CAST(Long , ConstantInt, int64_t)
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DEF_CAST(ULong , ConstantInt, uint64_t)
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DEF_CAST(Float , ConstantFP , float)
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DEF_CAST(Double, ConstantFP , double)
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#undef DEF_CAST
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static Constant *UDiv(const ConstantInt *V1, const ConstantInt *V2) {
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if (V2->isNullValue()) // X / 0
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return 0;
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@ -630,32 +479,6 @@ struct VISIBILITY_HIDDEN DirectFPRules
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return ConstantBool::get(R);
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}
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static Constant *CastToPointer(const ConstantFP *V,
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const PointerType *PTy) {
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if (V->isNullValue()) // Is it a FP or Integral null value?
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return ConstantPointerNull::get(PTy);
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return 0; // Can't const prop other types of pointers
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}
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// Casting operators. ick
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#define DEF_CAST(TYPE, CLASS, CTYPE) \
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static Constant *CastTo##TYPE (const ConstantFP *V) { \
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return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
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}
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DEF_CAST(Bool , ConstantBool, bool)
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DEF_CAST(SByte , ConstantInt, signed char)
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DEF_CAST(UByte , ConstantInt, unsigned char)
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DEF_CAST(Short , ConstantInt, signed short)
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DEF_CAST(UShort, ConstantInt, unsigned short)
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DEF_CAST(Int , ConstantInt, signed int)
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DEF_CAST(UInt , ConstantInt, unsigned int)
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DEF_CAST(Long , ConstantInt, int64_t)
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DEF_CAST(ULong , ConstantInt, uint64_t)
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DEF_CAST(Float , ConstantFP , float)
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DEF_CAST(Double, ConstantFP , double)
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#undef DEF_CAST
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static Constant *FRem(const ConstantFP *V1, const ConstantFP *V2) {
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if (V2->isNullValue()) return 0;
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BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
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@ -852,43 +675,67 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
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}
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}
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// We actually have to do a cast now, but first, we might need to fix up
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// the value of the operand.
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// We actually have to do a cast now. Perform the cast according to the
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// opcode specified.
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switch (opc) {
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case Instruction::PtrToInt:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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break;
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return ConstantFP::get(DestTy, cast<ConstantFP>(V)->getValue());
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case Instruction::FPToUI: {
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ConstRules &Rules = ConstRules::get(V, V);
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V = Rules.castToULong(V); // make sure we get an unsigned value first
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break;
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double dVal = cast<ConstantFP>(V)->getValue();
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uint64_t iVal = (uint64_t) dVal;
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return ConstantIntegral::get(DestTy, iVal);
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}
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case Instruction::FPToSI: {
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ConstRules &Rules = ConstRules::get(V, V);
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V = Rules.castToLong(V); // make sure we get a signed value first
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break;
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double dVal = cast<ConstantFP>(V)->getValue();
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int64_t iVal = (int64_t) dVal;
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return ConstantIntegral::get(DestTy, iVal);
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}
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case Instruction::IntToPtr: //always treated as unsigned
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case Instruction::UIToFP:
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case Instruction::ZExt:
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// A ZExt always produces an unsigned value so we need to cast the value
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// now before we try to cast it to the destination type
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if (V->isNullValue()) // Is it a FP or Integral null value?
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return ConstantPointerNull::get(cast<PointerType>(DestTy));
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return 0; // Other pointer types cannot be casted
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case Instruction::PtrToInt: // always treated as unsigned
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if (V->isNullValue())
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return ConstantIntegral::get(DestTy, 0);
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return 0; // Other pointer types cannot be casted
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case Instruction::UIToFP: {
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// First, extract the unsigned integer value
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uint64_t Val;
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if (isa<ConstantInt>(V))
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V = ConstantInt::get(SrcTy->getUnsignedVersion(),
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cast<ConstantIntegral>(V)->getZExtValue());
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break;
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case Instruction::SIToFP:
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Val = cast<ConstantIntegral>(V)->getZExtValue();
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V))
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Val = CB->getValue() ? 1 : 0;
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// Now generate the equivalent floating point value
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double dVal = (double) Val;
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return ConstantFP::get(DestTy, dVal);
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}
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case Instruction::SIToFP: {
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// First, extract the signed integer value
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int64_t Val;
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if (isa<ConstantInt>(V))
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Val = cast<ConstantIntegral>(V)->getSExtValue();
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V))
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Val = CB->getValue() ? -1 : 0;
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// Now generate the equivalent floating point value
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double dVal = (double) Val;
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return ConstantFP::get(DestTy, dVal);
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}
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case Instruction::ZExt:
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// Handle trunc directly here if it is a ConstantIntegral.
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if (isa<ConstantInt>(V))
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return ConstantInt::get(DestTy, cast<ConstantInt>(V)->getZExtValue());
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V))
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return ConstantInt::get(DestTy, CB->getValue() ? 1 : 0);
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return 0;
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case Instruction::SExt:
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// A SExt always produces a signed value so we need to cast the value
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// now before we try to cast it to the destiniation type.
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if (isa<ConstantInt>(V))
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V = ConstantInt::get(SrcTy->getSignedVersion(),
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cast<ConstantIntegral>(V)->getSExtValue());
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return ConstantInt::get(DestTy, cast<ConstantInt>(V)->getSExtValue());
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else if (const ConstantBool *CB = dyn_cast<ConstantBool>(V))
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V = ConstantInt::get(Type::SByteTy, CB->getValue() ? -1 : 0);
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break;
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return ConstantInt::get(DestTy, CB->getValue() ? -1 : 0);
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return 0;
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case Instruction::Trunc:
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// We just handle trunc directly here. The code below doesn't work for
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// trunc to bool.
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@ -896,7 +743,8 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
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return ConstantIntegral::get(DestTy, CI->getZExtValue());
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return 0;
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case Instruction::BitCast:
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if (SrcTy == DestTy) return (Constant*)V; // no-op cast
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if (SrcTy == DestTy)
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return (Constant*)V; // no-op cast
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// Check to see if we are casting a pointer to an aggregate to a pointer to
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// the first element. If so, return the appropriate GEP instruction.
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@ -995,25 +843,8 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, const Constant *V,
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break;
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}
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// Okay, no more folding possible, time to cast
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ConstRules &Rules = ConstRules::get(V, V);
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switch (DestTy->getTypeID()) {
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case Type::BoolTyID: return Rules.castToBool(V);
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case Type::UByteTyID: return Rules.castToUByte(V);
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case Type::SByteTyID: return Rules.castToSByte(V);
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case Type::UShortTyID: return Rules.castToUShort(V);
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case Type::ShortTyID: return Rules.castToShort(V);
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case Type::UIntTyID: return Rules.castToUInt(V);
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case Type::IntTyID: return Rules.castToInt(V);
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case Type::ULongTyID: return Rules.castToULong(V);
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case Type::LongTyID: return Rules.castToLong(V);
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case Type::FloatTyID: return Rules.castToFloat(V);
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case Type::DoubleTyID: return Rules.castToDouble(V);
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case Type::PointerTyID:
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return Rules.castToPointer(V, cast<PointerType>(DestTy));
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// what about packed ?
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default: return 0;
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}
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assert(0 && "Failed to cast constant expression");
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return 0;
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}
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Constant *llvm::ConstantFoldSelectInstruction(const Constant *Cond,
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