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Generate tree nodes for Phi instructions.

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llvm-svn: 337
This commit is contained in:
Vikram S. Adve 2001-07-31 21:49:53 +00:00
parent 46dd49a011
commit 5dcec96655
1 changed files with 16 additions and 23 deletions
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31
lib/CodeGen/InstrSelection/InstrForest.cpp
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@ -227,7 +227,6 @@ InstrForest::buildTreesForMethod(Method *method)
++instrIter)
{
Instruction *instr = *instrIter;
if (! instr->isPHINode())
(void) this->buildTreeForInstruction(instr);
}
}
@ -291,15 +290,13 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
this->noteTreeNodeForInstr(instr, treeNode);
// If the instruction has more than 2 instruction operands,
// then we will not add any children. This assumes that instructions
// like 'call' that have more than 2 instruction operands do not
// ever get combined with the instructions that compute the operands.
// Note that we only count operands of type instruction and not other
// values such as branch labels for a branch or switch instruction.
// then we need to create artificial list nodes to hold them.
// (Note that we only not count operands that get tree nodes, and not
// others such as branch labels for a branch or switch instruction.)
//
// To do this efficiently, we'll walk all operands, build treeNodes
// for all instruction operands and save them in an array, and then
// insert children at the end if there are not more than 2.
// for all appropriate operands and save them in an array. We then
// insert children at the end, creating list nodes where needed.
// As a performance optimization, allocate a child array only
// if a fixed array is too small.
//
@ -314,11 +311,9 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
//
// Walk the operands of the instruction
//
for (Instruction::op_iterator opIter = instr->op_begin();
opIter != instr->op_end();
++opIter)
for (Instruction::op_iterator O=instr->op_begin(); O != instr->op_end(); ++O)
{
Value* operand = *opIter;
Value* operand = *O;
// Check if the operand is a data value, not an branch label, type,
// method or module. If the operand is an address type (i.e., label
@ -331,8 +326,7 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
|| operand->getValueType() == Value::MethodVal)
&& ! instr->isTerminator());
if (/* (*opIter) != NULL
&&*/ includeAddressOperand
if ( includeAddressOperand
|| operand->getValueType() == Value::InstructionVal
|| operand->getValueType() == Value::ConstantVal
|| operand->getValueType() == Value::MethodArgumentVal)
@ -341,8 +335,7 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
// An instruction that computes the incoming value is added as a
// child of the current instruction if:
// the value has only a single use
// AND both instructions are in the same basic block
// AND the instruction is not a PHI
// AND both instructions are in the same basic block.
//
// (Note that if the value has only a single use (viz., `instr'),
// the def of the value can be safely moved just before instr
@ -354,8 +347,7 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
InstrTreeNode* opTreeNode;
if (operand->getValueType() == Value::InstructionVal
&& operand->use_size() == 1
&& ((Instruction*)operand)->getParent() == instr->getParent()
&& ! ((Instruction*)operand)->isPHINode())
&& ((Instruction*)operand)->getParent() == instr->getParent())
{
// Recursively create a treeNode for it.
opTreeNode =this->buildTreeForInstruction((Instruction*)operand);
@ -391,7 +383,8 @@ InstrForest::buildTreeForInstruction(Instruction* instr)
if (numChildren > 2)
{
unsigned instrOpcode = treeNode->getInstruction()->getOpcode();
assert(instrOpcode == Instruction::Call ||
assert(instrOpcode == Instruction::PHINode ||
instrOpcode == Instruction::Call ||
instrOpcode == Instruction::Load ||
instrOpcode == Instruction::Store ||
instrOpcode == Instruction::GetElementPtr);