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* Relax restriction that prevented malloc promotion in certain cases

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llvm-svn: 1125
This commit is contained in:
Chris Lattner 2001-11-04 22:11:10 +00:00
parent 843f32ad9b
commit f358050083
1 changed files with 22 additions and 21 deletions
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43
lib/Transforms/LevelRaise.cpp
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@ -784,7 +784,7 @@ static bool DoEliminatePointerArithmetic(const pair<Value*, CastInst*> &Val) {
// Peephole Malloc instructions: we take a look at the use chain of the
// malloc instruction, and try to find out if the following conditions hold:
// 1. The malloc is of the form: 'malloc [sbyte], uint <constant>'
// 2. The only users of the malloc are cast instructions
// 2. The only users of the malloc are cast & add instructions
// 3. Of the cast instructions, there is only one destination pointer type
// [RTy] where the size of the pointed to object is equal to the number
// of bytes allocated.
@ -807,30 +807,31 @@ static bool PeepholeMallocInst(BasicBlock *BB, BasicBlock::iterator &BI) {
// Loop over all of the uses of the malloc instruction, inspecting casts.
for (Value::use_iterator I = MI->use_begin(), E = MI->use_end();
I != E; ++I) {
if (!isa<CastInst>(*I)) {
if (!isa<CastInst>(*I) && !isa<BinaryOperator>(*I)) {
//cerr << "\tnon" << *I;
return false; // A non cast user?
}
CastInst *CI = cast<CastInst>(*I);
//cerr << "\t" << CI;
if (CastInst *CI = dyn_cast<CastInst>(*I)) {
//cerr << "\t" << CI;
// We only work on casts to pointer types for sure, be conservative
if (!isa<PointerType>(CI->getType())) {
cerr << "Found cast of malloc value to non pointer type:\n" << CI;
return false;
}
const Type *DestTy = cast<PointerType>(CI->getType())->getValueType();
if (TD.getTypeSize(DestTy) == Size && DestTy != ResultTy) {
// Does the size of the allocated type match the number of bytes
// allocated?
//
if (ResultTy == 0) {
ResultTy = DestTy; // Keep note of this for future uses...
} else {
// It's overdefined! We don't know which type to convert to!
// We only work on casts to pointer types for sure, be conservative
if (!isa<PointerType>(CI->getType())) {
cerr << "Found cast of malloc value to non pointer type:\n" << CI;
return false;
}
const Type *DestTy = cast<PointerType>(CI->getType())->getValueType();
if (TD.getTypeSize(DestTy) == Size && DestTy != ResultTy) {
// Does the size of the allocated type match the number of bytes
// allocated?
//
if (ResultTy == 0) {
ResultTy = DestTy; // Keep note of this for future uses...
} else {
// It's overdefined! We don't know which type to convert to!
return false;
}
}
}
}
@ -908,7 +909,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
if (!isReinterpretingCast(CI)) {
ValueTypeCache ConvertedTypes;
if (RetValConvertableToType(CI, Src->getType(), ConvertedTypes)) {
PRINT_PEEPHOLE2("EXPR-CONV:in ", CI, Src);
PRINT_PEEPHOLE2("CAST-DEST-EXPR-CONV:in ", CI, Src);
ValueMapCache ValueMap;
ConvertUsersType(CI, Src, ValueMap);
@ -917,7 +918,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
Src->setName(Name, BB->getParent()->getSymbolTable());
}
BI = BB->begin(); // Rescan basic block. BI might be invalidated.
PRINT_PEEPHOLE1("EXPR-CONV:out", I);
PRINT_PEEPHOLE1("CAST-DEST-EXPR-CONV:out", I);
return true;
}
}