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[Bitcode] Restore bitcast expression auto-upgrade 

Restore the autoupgrade from bitcast to ptrtoint+inttoptr, which
was lost as part of D127729.

This fixes the backwards compatibility issue noted in:
https://reviews.llvm.org/D127729#inline-1236519
This commit is contained in:
Nikita Popov 2022-06-29 14:16:30 +02:00
parent 30ea6a0636
commit 1271b8f57a
3 changed files with 5 additions and 3 deletions
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2
llvm/include/llvm/IR/AutoUpgrade.h
View File

@ -82,7 +82,7 @@ namespace llvm {
/// This is an auto-upgrade for bitcast constant expression between pointers
/// with different address spaces: the instruction is replaced by a pair
/// ptrtoint+inttoptr.
Value *UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy);
Constant *UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy);
/// Check the debug info version number, if it is out-dated, drop the debug
/// info. Return true if module is modified.

4
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -1442,7 +1442,9 @@ Expected<Value *> BitcodeReader::materializeValue(unsigned StartValID,
if (isConstExprSupported(BC->Opcode) && ConstOps.size() == Ops.size()) {
Constant *C;
if (Instruction::isCast(BC->Opcode)) {
C = ConstantExpr::getCast(BC->Opcode, ConstOps[0], BC->getType());
C = UpgradeBitCastExpr(BC->Opcode, ConstOps[0], BC->getType());
if (!C)
C = ConstantExpr::getCast(BC->Opcode, ConstOps[0], BC->getType());
} else if (Instruction::isUnaryOp(BC->Opcode)) {
C = ConstantExpr::get(BC->Opcode, ConstOps[0], BC->Flags);
} else if (Instruction::isBinaryOp(BC->Opcode)) {

2
llvm/lib/IR/AutoUpgrade.cpp
View File

@ -4179,7 +4179,7 @@ Instruction *llvm::UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
return nullptr;
}
Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
Constant *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
if (Opc != Instruction::BitCast)
return nullptr;