1 #include "llvm/CodeGen/IGNode.h"
2 #include "SparcInternals.h"
4 #include "llvm/Target/Sparc.h"
6 //-----------------------------------------------------------------------------
7 // Int Register Class - method for coloring a node in the interference graph.
10 // Record the colors/suggested colors of all neighbors.
12 // If there is a suggested color, try to allocate it
13 // If there is no call interf, try to allocate volatile, then non volatile
14 // If there is call interf, try to allocate non-volatile. If that fails
15 // try to allocate a volatile and insert save across calls
16 // If both above fail, spill.
18 //-----------------------------------------------------------------------------
19 void SparcIntRegClass::colorIGNode(IGNode * Node, bool IsColorUsedArr[]) const
21 LiveRange * LR = Node->getParentLR();
22 unsigned NumNeighbors = Node->getNumOfNeighbors(); // total # of neighbors
24 for(unsigned n=0; n < NumNeighbors; n++) { // for each neigh
25 IGNode *NeighIGNode = Node->getAdjIGNode(n);
26 LiveRange *NeighLR = NeighIGNode->getParentLR();
28 if( NeighLR->hasColor() ) // if has a color
29 IsColorUsedArr[ NeighLR->getColor() ] = true; // record that color
31 else if( NeighLR->hasSuggestedColor() ) {
33 // if the neighbout can use the suggested color
34 if( NeighLR-> isSuggestedColorUsable() )
35 IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
40 cout << "\nColoring LR [CallInt=" << LR->isCallInterference() <<"]:";
44 if( LR->hasSuggestedColor() ) {
46 unsigned SugCol = LR->getSuggestedColor();
48 if( ! IsColorUsedArr[ SugCol ] ) {
50 if( LR->isSuggestedColorUsable() ) {
52 // if the suggested color is volatile, we should use it only if
53 // there are no call interferences. Otherwise, it will get spilled.
56 cout << "\n -Coloring with sug color: " << SugCol;
58 LR->setColor( LR->getSuggestedColor() );
62 cout << "\n Couldn't alloc Sug col - LR voloatile & calls interf";
65 else if ( DEBUG_RA ) { // can't allocate the suggested col
66 cerr << " \n Could NOT allocate the suggested color (already used) ";
67 LR->printSet(); cerr << endl;
71 unsigned SearchStart; // start pos of color in pref-order
72 bool ColorFound= false; // have we found a color yet?
74 //if this Node is between calls
75 if( ! LR->isCallInterference() ) {
77 // start with volatiles (we can allocate volatiles safely)
78 SearchStart = SparcIntRegOrder::StartOfAllRegs;
81 // start with non volatiles (no non-volatiles)
82 SearchStart = SparcIntRegOrder::StartOfNonVolatileRegs;
85 unsigned c=0; // color
87 // find first unused color
88 for( c=SearchStart; c < SparcIntRegOrder::NumOfAvailRegs; c++) {
89 if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
93 LR->setColor(c); // first color found in preffered order
94 if (DEBUG_RA) cout << "\n Colored after first search with col " << c ;
97 // if color is not found because of call interference
98 // try even finding a volatile color and insert save across calls
100 else if( LR->isCallInterference() )
102 // start from 0 - try to find even a volatile this time
103 SearchStart = SparcIntRegOrder::StartOfAllRegs;
105 // find first unused volatile color
106 for(c=SearchStart; c < SparcIntRegOrder::StartOfNonVolatileRegs; c++) {
107 if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
112 // get the live range corresponding to live var
113 // since LR span across calls, must save across calls
115 LR->markForSaveAcrossCalls();
116 if(DEBUG_RA) cout << "\n Colored after SECOND search with col " << c ;
121 // If we couldn't find a color regardless of call interference - i.e., we
122 // don't have either a volatile or non-volatile color left
125 LR->markForSpill(); // no color found - must spill
129 UltraSparcRegInfo::printReg( LR );
138 //-----------------------------------------------------------------------------
139 // Float Register Class - method for coloring a node in the interference graph.
143 // If the LR is a double try to allocate f32 - f63
144 // If the above fails or LR is single precision
145 // If the LR does not interfere with a call
146 // start allocating from f0
147 // Else start allocating from f6
148 // If a color is still not found because LR interferes with a call
149 // Search in f0 - f6. If found mark for spill across calls.
150 // If a color is still not fond, mark for spilling
152 //----------------------------------------------------------------------------
153 void SparcFloatRegClass::colorIGNode(IGNode * Node,bool IsColorUsedArr[]) const
156 LiveRange * LR = Node->getParentLR();
157 unsigned NumNeighbors = Node->getNumOfNeighbors(); // total # of neighbors
159 for(unsigned n=0; n < NumNeighbors; n++) { // for each neigh
160 IGNode *NeighIGNode = Node->getAdjIGNode(n);
161 LiveRange *NeighLR = NeighIGNode->getParentLR();
163 if( NeighLR->hasColor() ) { // if neigh has a color
164 IsColorUsedArr[ NeighLR->getColor() ] = true; // record that color
165 if( NeighLR->getTypeID() == Type::DoubleTyID )
166 IsColorUsedArr[ (NeighLR->getColor()) + 1 ] = true;
168 else if( NeighLR->hasSuggestedColor() ) { // if neigh has sugg color
170 if( NeighLR-> isSuggestedColorUsable() ) {
172 // if the neighbout can use the suggested color
174 IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
175 if( NeighLR->getTypeID() == Type::DoubleTyID )
176 IsColorUsedArr[ (NeighLR->getSuggestedColor()) + 1 ] = true;
184 // **NOTE: We don't check for call interferences in allocating suggested
185 // color in this class since ALL registers are volatile. If this fact
186 // changes, we should change the following part
187 //- see SparcIntRegClass::colorIGNode()
189 if( LR->hasSuggestedColor() ) {
190 if( ! IsColorUsedArr[ LR->getSuggestedColor() ] ) {
191 LR->setColor( LR->getSuggestedColor() );
194 else if (DEBUG_RA) { // can't allocate the suggested col
195 cerr << " Could NOT allocate the suggested color for LR ";
196 LR->printSet(); cerr << endl;
201 int ColorFound = -1; // have we found a color yet?
202 bool isCallInterf = LR->isCallInterference();
204 // if value is a double - search the double only reigon (f32 - f63)
205 // i.e. we try to allocate f32 - f63 first for doubles since singles
206 // cannot go there. By doing that, we provide more space for singles
209 if( LR->getTypeID() == Type::DoubleTyID )
210 ColorFound = findFloatColor( LR, 32, 64, IsColorUsedArr );
213 if( ColorFound >= 0 ) { // if we could find a color
214 LR->setColor(ColorFound);
215 if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
220 // if we didn't find a color becuase the LR was single precision or
221 // all f32-f63 range is filled, we try to allocate a register from
222 // the f0 - f31 region
224 unsigned SearchStart; // start pos of color in pref-order
226 //if this Node is between calls (i.e., no call interferences )
227 if( ! isCallInterf ) {
228 // start with volatiles (we can allocate volatiles safely)
229 SearchStart = SparcFloatRegOrder::StartOfAllRegs;
232 // start with non volatiles (no non-volatiles)
233 SearchStart = SparcFloatRegOrder::StartOfNonVolatileRegs;
236 ColorFound = findFloatColor( LR, SearchStart, 32, IsColorUsedArr );
241 if( ColorFound >= 0 ) { // if we could find a color
242 LR->setColor(ColorFound);
243 if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
246 else if( isCallInterf ) {
248 // We are here because there is a call interference and no non-volatile
249 // color could be found.
250 // Now try to allocate even a volatile color
252 ColorFound = findFloatColor( LR, SparcFloatRegOrder::StartOfAllRegs,
253 SparcFloatRegOrder::StartOfNonVolatileRegs,
259 if( ColorFound >= 0 ) {
260 LR->setColor(ColorFound); // first color found in preffered order
261 LR->markForSaveAcrossCalls();
262 if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
267 // we are here because no color could be found
269 LR->markForSpill(); // no color found - must spill
270 if( DEBUG_RA) UltraSparcRegInfo::printReg( LR );
276 //-----------------------------------------------------------------------------
277 // Helper method for coloring a node of Float Reg class.
278 // Finds the first available color in the range [Start,End] depending on the
279 // type of the Node (i.e., float/double)
280 //-----------------------------------------------------------------------------
281 int SparcFloatRegClass::findFloatColor(const LiveRange *const LR,
284 bool IsColorUsedArr[] ) const {
286 bool ColorFound = false;
289 if( LR->getTypeID() == Type::DoubleTyID ) {
291 // find first unused color for a double
292 for( c=Start; c < End ;c+= 2){
293 if( ! IsColorUsedArr[ c ] && ! IsColorUsedArr[ c+1 ])
294 { ColorFound=true; break; }
299 // find first unused color for a single
300 for( c=Start; c < End; c++) {
301 if( ! IsColorUsedArr[ c ] ) { ColorFound=true; break; }
305 if( ColorFound ) return c;