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Extended TryMemCpy to work on structs

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This commit is contained in:
Brian Fiete 2020-08-12 11:42:15 -07:00
parent 0adfbce884
commit 0fbe15040d
2 changed files with 24 additions and 15 deletions
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31
IDEHelper/Compiler/BfIRCodeGen.cpp
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@ -312,7 +312,7 @@ BfIRCodeGen::BfIRCodeGen()
mLLVMContext = new llvm::LLVMContext();
mLLVMModule = NULL;
mIsCodeView = false;
mConstArrayIdx = 0;
mConstValIdx = 0;
mCmdCount = 0;
#ifdef BF_PLATFORM_WINDOWS
@ -1051,21 +1051,20 @@ void BfIRCodeGen::AddNop()
bool BfIRCodeGen::TryMemCpy(llvm::Value* ptr, llvm::Value* val)
{
auto arrayType = llvm::dyn_cast<llvm::ArrayType>(val->getType());
if (arrayType == NULL)
return false;
// LLVM has perf issues with large arrays - it treats each element as a unique value,
auto valType = val->getType();
auto dataLayout = llvm::DataLayout(mLLVMModule);
int arrayBytes = (int)dataLayout.getTypeSizeInBits(valType) / 8;
// LLVM has perf issues with large aggregates - it treats each element as a unique value,
// which is great for optimizing small data but is a perf killer for large data.
if (arrayType->getNumElements() <= 64)
if (arrayBytes < 256)
return false;
auto int8Ty = llvm::Type::getInt8Ty(*mLLVMContext);
auto int32Ty = llvm::Type::getInt32Ty(*mLLVMContext);
auto int8PtrTy = int8Ty->getPointerTo();
auto dataLayout = llvm::DataLayout(mLLVMModule);
int arrayBytes = (int)dataLayout.getTypeSizeInBits(arrayType) / 8;
if (auto loadInst = llvm::dyn_cast<llvm::LoadInst>(val))
{
mIRBuilder->CreateMemCpy(
@ -1081,13 +1080,23 @@ bool BfIRCodeGen::TryMemCpy(llvm::Value* ptr, llvm::Value* val)
if (constVal == NULL)
return false;
if (llvm::isa<llvm::ConstantAggregateZero>(constVal))
{
mIRBuilder->CreateMemSet(
mIRBuilder->CreateBitCast(ptr, int8PtrTy),
llvm::ConstantInt::get(int8Ty, 0),
llvm::ConstantInt::get(int32Ty, arrayBytes),
1);
return true;
}
auto globalVariable = new llvm::GlobalVariable(
*mLLVMModule,
arrayType,
valType,
true,
llvm::GlobalValue::InternalLinkage,
constVal,
StrFormat("__ConstArray__%d", mConstArrayIdx++).c_str(),
StrFormat("__ConstVal__%d", mConstValIdx++).c_str(),
NULL,
llvm::GlobalValue::NotThreadLocal);

2
IDEHelper/Compiler/BfIRCodeGen.h
View file

@ -77,7 +77,7 @@ public:
llvm::DebugLoc mDebugLoc;
bool mHasDebugLoc;
bool mIsCodeView;
int mConstArrayIdx;
int mConstValIdx;
int mCmdCount;
Dictionary<int, BfIRCodeGenEntry> mResults;