-- ruchira

llvm-svn: 632

1 files changed, 238 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcRegClassInfo.cpp b/llvm/lib/Target/Sparc/SparcRegClassInfo.cpp
new file mode 100644
index 00000000000..a6d7f9e060c
--- /dev/null
+++ b/llvm/lib/Target/Sparc/SparcRegClassInfo.cpp
@@ -0,0 +1,238 @@
+#include "llvm/CodeGen/IGNode.h"
+#include "SparcInternals.h"
+
+#include "llvm/Target/Sparc.h"
+
+//-----------------------------------------------------------------------------
+// Int Register Class
+//-----------------------------------------------------------------------------
+
+void SparcIntRegClass::colorIGNode(IGNode * Node, bool IsColorUsedArr[]) const 
+{
+
+  /* Algorithm:
+  Record the color of all neighbors.
+
+  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.
+
+  */
+
+  unsigned NumNeighbors =  Node->getNumOfNeighbors();   // total # of neighbors
+
+  for(unsigned n=0; n < NumNeighbors; n++) {            // for each neigh 
+    IGNode *NeighIGNode = Node->getAdjIGNode(n);
+    if( NeighIGNode->hasColor() ) {                     // if neigh has a color
+      IsColorUsedArr[ NeighIGNode->getColor() ] = true; // record that color
+    }
+  }
+
+
+
+  unsigned SearchStart;                 // start pos of color in pref-order
+  bool ColorFound= false;               // have we found a color yet?
+
+  //if this Node is between calls
+  if( Node->getNumOfCallInterferences() == 0) { 
+
+    // start with volatiles (we can  allocate volatiles safely)
+    SearchStart = SparcIntRegOrder::StartOfAllRegs;  
+  }
+  else {           
+    // start with non volatiles (no non-volatiles)
+    SearchStart =  SparcIntRegOrder::StartOfNonVolatileRegs;  
+  }
+
+  unsigned c=0;                         // color
+ 
+  // find first unused color
+  for( c=SearchStart; c < SparcIntRegOrder::NumOfAvailRegs; c++) { 
+    if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
+  }
+
+  if( ColorFound) 
+    Node->setColor(c);                  // first color found in preffered order
+
+  // if color is not found because of call interference
+  // try even finding a volatile color and insert save across calls
+  else if( Node->getNumOfCallInterferences() ) 
+  { 
+    // start from 0 - try to find even a volatile this time
+    SearchStart = SparcIntRegOrder::StartOfAllRegs;  
+
+    // find first unused volatile color
+    for(c=SearchStart; c < SparcIntRegOrder::StartOfNonVolatileRegs; c++) { 
+      if( ! IsColorUsedArr[ c ] ) { ColorFound = true; break; }
+    }
+
+    if( ColorFound) { 
+      Node->setColor(c);  
+      // since LR span across calls, must save across calls 
+      Node->markForSaveAcrossCalls();       
+    }
+
+  }
+
+  // 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 )  
+    Node->markForSpill();               // no color found - must spill
+
+
+  if( DEBUG_RA)                  
+    UltraSparcRegInfo::printReg( Node->getParentLR() );
+
+}
+
+
+
+
+
+
+//-----------------------------------------------------------------------------
+// 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 IGNode *const Node, unsigned Start,
+ 				       unsigned End, 
+				       bool IsColorUsedArr[] ) const
+{
+
+  bool ColorFound = false;
+  unsigned c;
+
+  if( Node->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;
+}
+
+
+
+
+
+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
+  */
+
+
+  unsigned NumNeighbors =  Node->getNumOfNeighbors();   // total # of neighbors
+
+  for(unsigned n=0; n < NumNeighbors; n++) {            // for each neigh 
+    IGNode *NeighIGNode = Node->getAdjIGNode(n);
+    if( NeighIGNode->hasColor() ) {                     // if neigh has a color
+      IsColorUsedArr[ NeighIGNode->getColor() ] = true; // record that color
+      if( NeighIGNode->getTypeID() == Type::DoubleTyID )
+	IsColorUsedArr[ (NeighIGNode->getColor()) + 1 ] = true;  
+    }
+  }
+
+  int ColorFound = -1;               // have we found a color yet?
+  unsigned NumOfCallInterf = Node->getNumOfCallInterferences();
+
+  // if value is a double - search the double only reigon (f32 - f63)
+  if( Node->getTypeID() == Type::DoubleTyID )       
+    ColorFound = findFloatColor( Node, 32, 64, IsColorUsedArr );
+    
+
+  if( ColorFound >= 0 ) {
+    Node->setColor(ColorFound);                
+    if( DEBUG_RA) UltraSparcRegInfo::printReg( Node->getParentLR() );
+    return;
+  }
+
+  else { // the above fails or LR is single precision
+
+    unsigned SearchStart;                 // start pos of color in pref-order
+
+    //if this Node is between calls (i.e., no call interferences )
+    if( ! NumOfCallInterf ) {
+      // start with volatiles (we can  allocate volatiles safely)
+      SearchStart = SparcFloatRegOrder::StartOfAllRegs;  
+    }
+    else {           
+      // start with non volatiles (no non-volatiles)
+      SearchStart =  SparcFloatRegOrder::StartOfNonVolatileRegs;  
+    }
+    
+    ColorFound = findFloatColor( Node, SearchStart, 32, IsColorUsedArr );
+
+  }
+
+  if( ColorFound >= 0 ) {
+    Node->setColor(ColorFound);                  
+    if( DEBUG_RA) UltraSparcRegInfo::printReg( Node->getParentLR() );
+    return;
+  }
+
+  else if( NumOfCallInterf ) { 
+
+    // We are here because there is a call interference and no non-volatile
+    // color could be found.
+    // Now try to allocate even a volatile color
+
+    ColorFound = findFloatColor( Node, SparcFloatRegOrder::StartOfAllRegs, 
+				SparcFloatRegOrder::StartOfNonVolatileRegs,
+				IsColorUsedArr);
+  }
+
+  if( ColorFound >= 0 ) {
+    Node->setColor(ColorFound);         // first color found in preffered order
+    Node->markForSaveAcrossCalls();  
+    if( DEBUG_RA) UltraSparcRegInfo::printReg( Node->getParentLR() );
+    return;
+  }
+
+  else {
+    Node->markForSpill();               // no color found - must spill
+    if( DEBUG_RA) UltraSparcRegInfo::printReg( Node->getParentLR() );
+  }
+  
+
+}
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