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Sign-extend array index expressions to work correctly on non-32 bit machines.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3496 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve
2002-08-24 14:44:23 +00:00
parent e6f9a91618
commit 42eb2bae8e
2 changed files with 18 additions and 8 deletions
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13
lib/Target/CBackend/CBackend.cpp
View File

@ -210,7 +210,8 @@ ostream &CWriter::printType(const Type *Ty, const string &NameSoFar,
case Type::PointerTyID: { case Type::PointerTyID: {
const PointerType *PTy = cast<PointerType>(Ty); const PointerType *PTy = cast<PointerType>(Ty);
return printType(PTy->getElementType(), "(*" + NameSoFar + ")"); std::string ptrName = NameSoFar.length()? "(*"+NameSoFar+")" : string("*");
return printType(PTy->getElementType(), ptrName);
} }
case Type::ArrayTyID: { case Type::ArrayTyID: {
@ -844,16 +845,20 @@ void CWriter::printIndexingExpression(Value *Ptr, User::op_iterator I,
Out << (HasImplicitAddress ? "." : "->"); Out << (HasImplicitAddress ? "." : "->");
Out << "field" << cast<ConstantUInt>(*(I+1))->getValue(); Out << "field" << cast<ConstantUInt>(*(I+1))->getValue();
I += 2; I += 2;
} else { // Performing array indexing. Just skip the 0 } else { // First array index of 0: Just skip it
++I; ++I;
} }
} }
for (; I != E; ++I) for (; I != E; ++I)
if ((*I)->getType() == Type::UIntTy) { if ((*I)->getType() == Type::UIntTy) {
Out << "["; Out << "[((int) ("; // sign-extend from 32 (to 64) bits
writeOperand(*I); writeOperand(*I);
Out << "]"; Out << " * sizeof(";
printType(cast<PointerType>(Ptr->getType())->getElementType());
Out << "))) / sizeof(";
printType(cast<PointerType>(Ptr->getType())->getElementType());
Out << ")]";
} else { } else {
Out << ".field" << cast<ConstantUInt>(*I)->getValue(); Out << ".field" << cast<ConstantUInt>(*I)->getValue();
} }

13
lib/Target/CBackend/Writer.cpp
View File

@ -210,7 +210,8 @@ ostream &CWriter::printType(const Type *Ty, const string &NameSoFar,
case Type::PointerTyID: { case Type::PointerTyID: {
const PointerType *PTy = cast<PointerType>(Ty); const PointerType *PTy = cast<PointerType>(Ty);
return printType(PTy->getElementType(), "(*" + NameSoFar + ")"); std::string ptrName = NameSoFar.length()? "(*"+NameSoFar+")" : string("*");
return printType(PTy->getElementType(), ptrName);
} }
case Type::ArrayTyID: { case Type::ArrayTyID: {
@ -844,16 +845,20 @@ void CWriter::printIndexingExpression(Value *Ptr, User::op_iterator I,
Out << (HasImplicitAddress ? "." : "->"); Out << (HasImplicitAddress ? "." : "->");
Out << "field" << cast<ConstantUInt>(*(I+1))->getValue(); Out << "field" << cast<ConstantUInt>(*(I+1))->getValue();
I += 2; I += 2;
} else { // Performing array indexing. Just skip the 0 } else { // First array index of 0: Just skip it
++I; ++I;
} }
} }
for (; I != E; ++I) for (; I != E; ++I)
if ((*I)->getType() == Type::UIntTy) { if ((*I)->getType() == Type::UIntTy) {
Out << "["; Out << "[((int) ("; // sign-extend from 32 (to 64) bits
writeOperand(*I); writeOperand(*I);
Out << "]"; Out << " * sizeof(";
printType(cast<PointerType>(Ptr->getType())->getElementType());
Out << "))) / sizeof(";
printType(cast<PointerType>(Ptr->getType())->getElementType());
Out << ")]";
} else { } else {
Out << ".field" << cast<ConstantUInt>(*I)->getValue(); Out << ".field" << cast<ConstantUInt>(*I)->getValue();
} }