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added support for implict operands in machine instruction

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ruchira Sasanka
2001-10-12 17:47:23 +00:00
parent 598641b4ca
commit c1daae895d
4 changed files with 152 additions and 58 deletions
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89
lib/Analysis/LiveVar/BBLiveVar.cpp
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@ -41,20 +41,17 @@ void BBLiveVar::calcDefUseSets()
// iterate over MI operands to find defs
for( MachineInstr::val_op_const_iterator OpI(MInst); !OpI.done() ; ++OpI) {
const Value *Op = *OpI;
if( OpI.isDef() ) { // add to Defs only if this operand is a def
DefSet.add( Op ); // operand is a def - so add to def set
InSet.remove( Op); // this definition kills any uses
InSetChanged = true;
if( DEBUG_LV > 1) {
cout << " +Def: "; printValue( Op ); cout << endl;
}
}
if( OpI.isDef() ) // add to Defs only if this operand is a def
addDef( *OpI );
}
// do for implicit operands as well
for( unsigned i=0; i < MInst->getNumImplicitRefs(); ++i) {
if( MInst->implicitRefIsDefined(i) )
addDef( MInst->getImplicitRef(i) );
}
bool IsPhi = ( MInst->getOpCode() == PHI );
@ -65,29 +62,22 @@ void BBLiveVar::calcDefUseSets()
if ( ((Op)->getType())->isLabelType() )
continue; // don't process labels
if(! OpI.isDef() ) { // add to Defs only if this operand is a use
InSet.add( Op ); // An operand is a use - so add to use set
OutSet.remove( Op ); // remove if there is a def below this use
InSetChanged = true;
if( DEBUG_LV > 1) { // debug msg of level 2
cout << " Use: "; printValue( Op ); cout << endl;
}
if(! OpI.isDef() ) { // add to Defs only if this operand is a use
addUse( Op );
if( IsPhi ) { // for a phi node
// put args into the PhiArgMap (Val -> BB)
// put args into the PhiArgMap (Val -> BB)
const Value * ArgVal = Op;
++OpI; // increment to point to BB of value
const Value * BBVal = *OpI;
assert( (BBVal)->getValueType() == Value::BasicBlockVal );
PhiArgMap[ ArgVal ] = (const BasicBlock *) (BBVal);
assert( PhiArgMap[ ArgVal ] );
if( DEBUG_LV > 1) { // debug msg of level 2
cout << " - phi operand ";
printValue( ArgVal );
@ -96,15 +86,56 @@ void BBLiveVar::calcDefUseSets()
cout<<endl;
}
}
} // if( IsPhi )
}
}
} // if a use
} // for all operands
// do for implicit operands as well
for( unsigned i=0; i < MInst->getNumImplicitRefs(); ++i) {
assert( !IsPhi && "Phi cannot have implicit opeands");
const Value *Op = MInst->getImplicitRef(i);
if ( ((Op)->getType())->isLabelType() )
continue; // don't process labels
if( ! MInst->implicitRefIsDefined(i) )
addUse( Op );
}
} // for all machine instructions
}
// To add an operand wichi is a def
void BBLiveVar::addDef(const Value *Op)
{
DefSet.add( Op ); // operand is a def - so add to def set
InSet.remove( Op); // this definition kills any uses
InSetChanged = true;
if( DEBUG_LV > 1) {
cout << " +Def: "; printValue( Op ); cout << endl;
}
}
// To add an operand which is a use
void BBLiveVar::addUse(const Value *Op)
{
InSet.add( Op ); // An operand is a use - so add to use set
OutSet.remove( Op ); // remove if there is a def below this use
InSetChanged = true;
if( DEBUG_LV > 1) { // debug msg of level 2
cout << " Use: "; printValue( Op ); cout << endl;
}
}
bool BBLiveVar::applyTransferFunc() // calculates the InSet in terms of OutSet
{