+#include "SparcRegClassInfo.h"
#include "llvm/CodeGen/IGNode.h"
-#include "SparcInternals.h"
-
#include "llvm/Target/Sparc.h"
+#include <iostream>
+using std::cerr;
//-----------------------------------------------------------------------------
-// Int Register Class
+// Int Register Class - method for coloring a node in the interference graph.
+//
+// Algorithm:
+// Record the colors/suggested colors of all neighbors.
+//
+// If there is a suggested color, try to allocate it
+// If there is no call interf, try to allocate volatile, then non volatile
+// If there is call interf, try to allocate non-volatile. If that fails
+// try to allocate a volatile and insert save across calls
+// If both above fail, spill.
+//
//-----------------------------------------------------------------------------
-
-void SparcIntRegClass::colorIGNode(IGNode * Node, bool IsColorUsedArr[]) const
-{
-
- /* Algorithm:
- Record the colors/suggested colors of all neighbors.
-
- If there is a suggested color, try to allocate it
- If there is no call interf, try to allocate volatile, then non volatile
- If there is call interf, try to allocate non-volatile. If that fails
- try to allocate a volatile and insert save across calls
- If both above fail, spill.
-
- */
-
- LiveRange * LR = Node->getParentLR();
+void SparcIntRegClass::colorIGNode(IGNode * Node, bool IsColorUsedArr[]) const {
+ LiveRange *LR = Node->getParentLR();
unsigned NumNeighbors = Node->getNumOfNeighbors(); // total # of neighbors
- for(unsigned n=0; n < NumNeighbors; n++) { // for each neigh
+ for (unsigned n=0; n < NumNeighbors; n++) { // for each neigh
IGNode *NeighIGNode = Node->getAdjIGNode(n);
LiveRange *NeighLR = NeighIGNode->getParentLR();
- if( NeighLR->hasColor() ) // if has a color
- IsColorUsedArr[ NeighLR->getColor() ] = true; // record that color
+ if(NeighLR->hasColor()) // if has a color
+ IsColorUsedArr[NeighLR->getColor()] = true; // record that color
- else if( NeighLR->hasSuggestedColor() ) // or has a suggest col
- IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
-
+ else if (NeighLR->hasSuggestedColor()) {
+
+ // if the neighbout can use the suggested color
+ if(NeighLR->isSuggestedColorUsable())
+ IsColorUsedArr[NeighLR->getSuggestedColor()] = true;
+ }
}
+ if( DEBUG_RA ) {
+ cerr << "\nColoring LR [CallInt=" << LR->isCallInterference() <<"]:";
+ LR->printSet();
+ }
if( LR->hasSuggestedColor() ) {
- if( ! IsColorUsedArr[ LR->getSuggestedColor() ] ) {
- LR->setColor( LR->getSuggestedColor() );
- return;
+
+ unsigned SugCol = LR->getSuggestedColor();
+
+ if( ! IsColorUsedArr[ SugCol ] ) {
+
+ if( LR->isSuggestedColorUsable() ) {
+
+ // if the suggested color is volatile, we should use it only if
+ // there are no call interferences. Otherwise, it will get spilled.
+
+ if (DEBUG_RA)
+ cerr << "\n -Coloring with sug color: " << SugCol;
+
+ LR->setColor( LR->getSuggestedColor() );
+ return;
+ }
+ else if(DEBUG_RA)
+ cerr << "\n Couldn't alloc Sug col - LR voloatile & calls interf";
+
}
else if ( DEBUG_RA ) { // can't allocate the suggested col
- cerr << " Could NOT allocate the suggested color for LR ";
- LR->printSet(); cerr << endl;
+ cerr << " \n Could NOT allocate the suggested color (already used) ";
+ LR->printSet(); cerr << "\n";
}
}
bool ColorFound= false; // have we found a color yet?
//if this Node is between calls
- if( LR->getNumOfCallInterferences() == 0) {
+ if( ! LR->isCallInterference() ) {
// start with volatiles (we can allocate volatiles safely)
SearchStart = SparcIntRegOrder::StartOfAllRegs;
if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
}
- if( ColorFound)
+ if( ColorFound) {
LR->setColor(c); // first color found in preffered order
-
+ if (DEBUG_RA) cerr << "\n Colored after first search with col " << c ;
+ }
// if color is not found because of call interference
// try even finding a volatile color and insert save across calls
- else if( LR->getNumOfCallInterferences() )
+ //
+ else if( LR->isCallInterference() )
{
// start from 0 - try to find even a volatile this time
SearchStart = SparcIntRegOrder::StartOfAllRegs;
if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
}
- if( ColorFound) {
- LR->setColor(c);
- // since LR span across calls, must save across calls
- LR->markForSaveAcrossCalls();
+ if (ColorFound) {
+ LR->setColor(c);
+ // get the live range corresponding to live var
+ // since LR span across calls, must save across calls
+ //
+ LR->markForSaveAcrossCalls();
+ if(DEBUG_RA) cerr << "\n Colored after SECOND search with col " << c ;
}
-
}
// If we couldn't find a color regardless of call interference - i.e., we
// don't have either a volatile or non-volatile color left
- if( !ColorFound )
+ //
+ if (!ColorFound)
LR->markForSpill(); // no color found - must spill
-
-
- if( DEBUG_RA)
- UltraSparcRegInfo::printReg( LR );
-
}
//-----------------------------------------------------------------------------
-// Float Register Class
-//-----------------------------------------------------------------------------
-
-// find the first available color in the range [Start,End] depending on the
-// type of the Node (i.e., float/double)
-
-int SparcFloatRegClass::findFloatColor(const LiveRange *const LR,
- unsigned Start,
- unsigned End,
- bool IsColorUsedArr[] ) const
-{
-
- bool ColorFound = false;
- unsigned c;
-
- if( LR->getTypeID() == Type::DoubleTyID ) {
-
- // find first unused color for a double
- for( c=Start; c < End ;c+= 2){
- if( ! IsColorUsedArr[ c ] && ! IsColorUsedArr[ c+1 ])
- { ColorFound=true; break; }
- }
-
- } else {
-
- // find first unused color for a single
- for( c=Start; c < End; c++) {
- if( ! IsColorUsedArr[ c ] ) { ColorFound=true; break; }
- }
- }
-
- if( ColorFound ) return c;
- else return -1;
-}
-
-
-
-
-
+// Float Register Class - method for coloring a node in the interference graph.
+//
+// Algorithm:
+//
+// If the LR is a double try to allocate f32 - f63
+// If the above fails or LR is single precision
+// If the LR does not interfere with a call
+// start allocating from f0
+// Else start allocating from f6
+// If a color is still not found because LR interferes with a call
+// Search in f0 - f6. If found mark for spill across calls.
+// If a color is still not fond, mark for spilling
+//
+//----------------------------------------------------------------------------
void SparcFloatRegClass::colorIGNode(IGNode * Node,bool IsColorUsedArr[]) const
{
- /* Algorithm:
-
- If the LR is a double try to allocate f32 - f63
- If the above fails or LR is single precision
- If the LR does not interfere with a call
- start allocating from f0
- Else start allocating from f6
- If a color is still not found because LR interferes with a call
- Search in f0 - f6. If found mark for spill across calls.
- If a color is still not fond, mark for spilling
- */
-
-
LiveRange * LR = Node->getParentLR();
unsigned NumNeighbors = Node->getNumOfNeighbors(); // total # of neighbors
IsColorUsedArr[ (NeighLR->getColor()) + 1 ] = true;
}
else if( NeighLR->hasSuggestedColor() ) { // if neigh has sugg color
- IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
- if( NeighLR->getTypeID() == Type::DoubleTyID )
- IsColorUsedArr[ (NeighLR->getSuggestedColor()) + 1 ] = true;
+
+ if( NeighLR-> isSuggestedColorUsable() ) {
+
+ // if the neighbout can use the suggested color
+
+ IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
+ if( NeighLR->getTypeID() == Type::DoubleTyID )
+ IsColorUsedArr[ (NeighLR->getSuggestedColor()) + 1 ] = true;
+ }
+
}
}
+ // **NOTE: We don't check for call interferences in allocating suggested
+ // color in this class since ALL registers are volatile. If this fact
+ // changes, we should change the following part
+ //- see SparcIntRegClass::colorIGNode()
+
if( LR->hasSuggestedColor() ) {
if( ! IsColorUsedArr[ LR->getSuggestedColor() ] ) {
LR->setColor( LR->getSuggestedColor() );
}
else if (DEBUG_RA) { // can't allocate the suggested col
cerr << " Could NOT allocate the suggested color for LR ";
- LR->printSet(); cerr << endl;
+ LR->printSet(); cerr << "\n";
}
}
int ColorFound = -1; // have we found a color yet?
- unsigned NumOfCallInterf = LR->getNumOfCallInterferences();
+ bool isCallInterf = LR->isCallInterference();
// if value is a double - search the double only reigon (f32 - f63)
+ // i.e. we try to allocate f32 - f63 first for doubles since singles
+ // cannot go there. By doing that, we provide more space for singles
+ // in f0 - f31
+ //
if( LR->getTypeID() == Type::DoubleTyID )
ColorFound = findFloatColor( LR, 32, 64, IsColorUsedArr );
- if( ColorFound >= 0 ) {
+ if( ColorFound >= 0 ) { // if we could find a color
LR->setColor(ColorFound);
- if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
return;
- }
+ } else {
- else { // the above fails or LR is single precision
+ // if we didn't find a color becuase the LR was single precision or
+ // all f32-f63 range is filled, we try to allocate a register from
+ // the f0 - f31 region
unsigned SearchStart; // start pos of color in pref-order
//if this Node is between calls (i.e., no call interferences )
- if( ! NumOfCallInterf ) {
+ if( ! isCallInterf ) {
// start with volatiles (we can allocate volatiles safely)
SearchStart = SparcFloatRegOrder::StartOfAllRegs;
}
}
ColorFound = findFloatColor( LR, SearchStart, 32, IsColorUsedArr );
-
}
- if( ColorFound >= 0 ) {
+
+
+ if( ColorFound >= 0 ) { // if we could find a color
LR->setColor(ColorFound);
- if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
return;
}
-
-
- else if( NumOfCallInterf ) {
+ else if( isCallInterf ) {
// We are here because there is a call interference and no non-volatile
// color could be found.
if( ColorFound >= 0 ) {
LR->setColor(ColorFound); // first color found in preffered order
LR->markForSaveAcrossCalls();
- if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
- return;
+ } else {
+ // we are here because no color could be found
+ LR->markForSpill(); // no color found - must spill
}
-
-
- // we are here because no color could be found
-
- LR->markForSpill(); // no color found - must spill
- if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
-
-
}
+//-----------------------------------------------------------------------------
+// Helper method for coloring a node of Float Reg class.
+// Finds the first available color in the range [Start,End] depending on the
+// type of the Node (i.e., float/double)
+//-----------------------------------------------------------------------------
+int SparcFloatRegClass::findFloatColor(const LiveRange *LR,
+ unsigned Start, unsigned End,
+ bool IsColorUsedArr[] ) const {
+ bool ColorFound = false;
+ unsigned c;
-
-
-
-
-
-
-
-
-
-
-
-
+ if (LR->getTypeID() == Type::DoubleTyID) {
+ // find first unused color for a double
+ for (c=Start; c < End ; c+= 2)
+ if (!IsColorUsedArr[c] && !IsColorUsedArr[c+1])
+ return c;
+ } else {
+ // find first unused color for a single
+ for (c = Start; c < End; c++)
+ if (!IsColorUsedArr[c])
+ return c;
+ }
+
+ return -1;
+}
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