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HeapAllocSRoA also needs to check if malloc array size can be computed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez
2009-10-16 23:12:25 +00:00
parent 362b8f2786
commit 8db42d2b1c
2 changed files with 63 additions and 33 deletions
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70
lib/Transforms/IPO/GlobalOpt.cpp
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@ -1586,6 +1586,8 @@ static GlobalVariable *PerformHeapAllocSRoA(GlobalVariable *GV,
<< " BITCAST = " << *BCI << '\n');
const Type* MAT = getMallocAllocatedType(CI);
const StructType *STy = cast<StructType>(MAT);
Value* ArraySize = getMallocArraySize(CI, Context, TD);
assert(ArraySize && "not a malloc whose array size can be determined");
// There is guaranteed to be at least one use of the malloc (storing
// it into GV). If there are other uses, change them to be uses of
@ -1610,8 +1612,8 @@ static GlobalVariable *PerformHeapAllocSRoA(GlobalVariable *GV,
GV->isThreadLocal());
FieldGlobals.push_back(NGV);
Value *NMI = CallInst::CreateMalloc(CI, TD->getIntPtrType(Context), FieldTy,
getMallocArraySize(CI, Context, TD),
Value *NMI = CallInst::CreateMalloc(CI, TD->getIntPtrType(Context),
FieldTy, ArraySize,
BCI->getName() + ".f" + Twine(FieldNo));
FieldMallocs.push_back(NMI);
new StoreInst(NMI, NGV, BCI);
@ -1892,6 +1894,7 @@ static bool TryToOptimizeStoreOfMallocToGlobal(GlobalVariable *GV,
// This eliminates dynamic allocation, avoids an indirection accessing the
// data, and exposes the resultant global to further GlobalOpt.
Value *NElems = getMallocArraySize(CI, Context, TD);
// We cannot optimize the malloc if we cannot determine malloc array size.
if (NElems) {
if (ConstantInt *NElements = dyn_cast<ConstantInt>(NElems))
// Restrict this transformation to only working on small allocations
@ -1902,42 +1905,43 @@ static bool TryToOptimizeStoreOfMallocToGlobal(GlobalVariable *GV,
GVI = OptimizeGlobalAddressOfMalloc(GV, CI, BCI, Context, TD);
return true;
}
}
// If the allocation is an array of structures, consider transforming this
// into multiple malloc'd arrays, one for each field. This is basically
// SRoA for malloc'd memory.
// If the allocation is an array of structures, consider transforming this
// into multiple malloc'd arrays, one for each field. This is basically
// SRoA for malloc'd memory.
// If this is an allocation of a fixed size array of structs, analyze as a
// variable size array. malloc [100 x struct],1 -> malloc struct, 100
if (!isArrayMalloc(CI, Context, TD))
if (const ArrayType *AT = dyn_cast<ArrayType>(AllocTy))
AllocTy = AT->getElementType();
// If this is an allocation of a fixed size array of structs, analyze as a
// variable size array. malloc [100 x struct],1 -> malloc struct, 100
if (!isArrayMalloc(CI, Context, TD))
if (const ArrayType *AT = dyn_cast<ArrayType>(AllocTy))
AllocTy = AT->getElementType();
if (const StructType *AllocSTy = dyn_cast<StructType>(AllocTy)) {
// This the structure has an unreasonable number of fields, leave it
// alone.
if (AllocSTy->getNumElements() <= 16 && AllocSTy->getNumElements() != 0 &&
AllGlobalLoadUsesSimpleEnoughForHeapSRA(GV, BCI)) {
if (const StructType *AllocSTy = dyn_cast<StructType>(AllocTy)) {
// This the structure has an unreasonable number of fields, leave it
// alone.
if (AllocSTy->getNumElements() <= 16 && AllocSTy->getNumElements() != 0 &&
AllGlobalLoadUsesSimpleEnoughForHeapSRA(GV, BCI)) {
// If this is a fixed size array, transform the Malloc to be an alloc of
// structs. malloc [100 x struct],1 -> malloc struct, 100
if (const ArrayType *AT = dyn_cast<ArrayType>(getMallocAllocatedType(CI))) {
Value* NumElements = ConstantInt::get(Type::getInt32Ty(Context),
AT->getNumElements());
Value* NewMI = CallInst::CreateMalloc(CI, TD->getIntPtrType(Context),
AllocSTy, NumElements,
BCI->getName());
Value *Cast = new BitCastInst(NewMI, getMallocType(CI), "tmp", CI);
BCI->replaceAllUsesWith(Cast);
BCI->eraseFromParent();
CI->eraseFromParent();
BCI = cast<BitCastInst>(NewMI);
CI = extractMallocCallFromBitCast(NewMI);
}
// If this is a fixed size array, transform the Malloc to be an alloc of
// structs. malloc [100 x struct],1 -> malloc struct, 100
if (const ArrayType *AT =
dyn_cast<ArrayType>(getMallocAllocatedType(CI))) {
Value* NumElements = ConstantInt::get(Type::getInt32Ty(Context),
AT->getNumElements());
Value* NewMI = CallInst::CreateMalloc(CI, TD->getIntPtrType(Context),
AllocSTy, NumElements,
BCI->getName());
Value *Cast = new BitCastInst(NewMI, getMallocType(CI), "tmp", CI);
BCI->replaceAllUsesWith(Cast);
BCI->eraseFromParent();
CI->eraseFromParent();
BCI = cast<BitCastInst>(NewMI);
CI = extractMallocCallFromBitCast(NewMI);
}
GVI = PerformHeapAllocSRoA(GV, CI, BCI, Context, TD);
return true;
GVI = PerformHeapAllocSRoA(GV, CI, BCI, Context, TD);
return true;
}
}
}