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