1 #include "SparcRegClassInfo.h"
2 #include "llvm/CodeGen/IGNode.h"
3 #include "llvm/Target/Sparc.h"
7 //-----------------------------------------------------------------------------
8 // Int Register Class - method for coloring a node in the interference graph.
11 // Record the colors/suggested colors of all neighbors.
13 // If there is a suggested color, try to allocate it
14 // If there is no call interf, try to allocate volatile, then non volatile
15 // If there is call interf, try to allocate non-volatile. If that fails
16 // try to allocate a volatile and insert save across calls
17 // If both above fail, spill.
19 //-----------------------------------------------------------------------------
20 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 cerr << "\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 cerr << "\n -Coloring with sug color: " << SugCol;
58 LR->setColor( LR->getSuggestedColor() );
62 cerr << "\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 << "\n";
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) cerr << "\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) cerr << "\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
133 //-----------------------------------------------------------------------------
134 // Float Register Class - method for coloring a node in the interference graph.
138 // If the LR is a double try to allocate f32 - f63
139 // If the above fails or LR is single precision
140 // If the LR does not interfere with a call
141 // start allocating from f0
142 // Else start allocating from f6
143 // If a color is still not found because LR interferes with a call
144 // Search in f0 - f6. If found mark for spill across calls.
145 // If a color is still not fond, mark for spilling
147 //----------------------------------------------------------------------------
148 void SparcFloatRegClass::colorIGNode(IGNode * Node,bool IsColorUsedArr[]) const
151 LiveRange * LR = Node->getParentLR();
152 unsigned NumNeighbors = Node->getNumOfNeighbors(); // total # of neighbors
154 for(unsigned n=0; n < NumNeighbors; n++) { // for each neigh
155 IGNode *NeighIGNode = Node->getAdjIGNode(n);
156 LiveRange *NeighLR = NeighIGNode->getParentLR();
158 if( NeighLR->hasColor() ) { // if neigh has a color
159 IsColorUsedArr[ NeighLR->getColor() ] = true; // record that color
160 if( NeighLR->getTypeID() == Type::DoubleTyID )
161 IsColorUsedArr[ (NeighLR->getColor()) + 1 ] = true;
163 else if( NeighLR->hasSuggestedColor() ) { // if neigh has sugg color
165 if( NeighLR-> isSuggestedColorUsable() ) {
167 // if the neighbout can use the suggested color
169 IsColorUsedArr[ NeighLR->getSuggestedColor() ] = true;
170 if( NeighLR->getTypeID() == Type::DoubleTyID )
171 IsColorUsedArr[ (NeighLR->getSuggestedColor()) + 1 ] = true;
179 // **NOTE: We don't check for call interferences in allocating suggested
180 // color in this class since ALL registers are volatile. If this fact
181 // changes, we should change the following part
182 //- see SparcIntRegClass::colorIGNode()
184 if( LR->hasSuggestedColor() ) {
185 if( ! IsColorUsedArr[ LR->getSuggestedColor() ] ) {
186 LR->setColor( LR->getSuggestedColor() );
189 else if (DEBUG_RA) { // can't allocate the suggested col
190 cerr << " Could NOT allocate the suggested color for LR ";
191 LR->printSet(); cerr << "\n";
196 int ColorFound = -1; // have we found a color yet?
197 bool isCallInterf = LR->isCallInterference();
199 // if value is a double - search the double only reigon (f32 - f63)
200 // i.e. we try to allocate f32 - f63 first for doubles since singles
201 // cannot go there. By doing that, we provide more space for singles
204 if( LR->getTypeID() == Type::DoubleTyID )
205 ColorFound = findFloatColor( LR, 32, 64, IsColorUsedArr );
208 if( ColorFound >= 0 ) { // if we could find a color
209 LR->setColor(ColorFound);
213 // if we didn't find a color becuase the LR was single precision or
214 // all f32-f63 range is filled, we try to allocate a register from
215 // the f0 - f31 region
217 unsigned SearchStart; // start pos of color in pref-order
219 //if this Node is between calls (i.e., no call interferences )
220 if( ! isCallInterf ) {
221 // start with volatiles (we can allocate volatiles safely)
222 SearchStart = SparcFloatRegOrder::StartOfAllRegs;
225 // start with non volatiles (no non-volatiles)
226 SearchStart = SparcFloatRegOrder::StartOfNonVolatileRegs;
229 ColorFound = findFloatColor( LR, SearchStart, 32, IsColorUsedArr );
234 if( ColorFound >= 0 ) { // if we could find a color
235 LR->setColor(ColorFound);
238 else if( isCallInterf ) {
240 // We are here because there is a call interference and no non-volatile
241 // color could be found.
242 // Now try to allocate even a volatile color
244 ColorFound = findFloatColor( LR, SparcFloatRegOrder::StartOfAllRegs,
245 SparcFloatRegOrder::StartOfNonVolatileRegs,
251 if( ColorFound >= 0 ) {
252 LR->setColor(ColorFound); // first color found in preffered order
253 LR->markForSaveAcrossCalls();
255 // we are here because no color could be found
256 LR->markForSpill(); // no color found - must spill
261 //-----------------------------------------------------------------------------
262 // Helper method for coloring a node of Float Reg class.
263 // Finds the first available color in the range [Start,End] depending on the
264 // type of the Node (i.e., float/double)
265 //-----------------------------------------------------------------------------
267 int SparcFloatRegClass::findFloatColor(const LiveRange *LR,
268 unsigned Start, unsigned End,
269 bool IsColorUsedArr[] ) const {
270 bool ColorFound = false;
273 if (LR->getTypeID() == Type::DoubleTyID) {
274 // find first unused color for a double
275 for (c=Start; c < End ; c+= 2)
276 if (!IsColorUsedArr[c] && !IsColorUsedArr[c+1])
279 // find first unused color for a single
280 for (c = Start; c < End; c++)
281 if (!IsColorUsedArr[c])