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b5f662fa03
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21425 91177308-0d34-0410-b5e6-96231b3b80d8
398 lines
15 KiB
C++
398 lines
15 KiB
C++
//===-- SparcV9RegClassInfo.cpp - Register class def'ns for SparcV9 -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the methods used by the SparcV9 register allocator
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// to pick registers of various classes. Most of this code should be
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// considered part of the register allocator.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Type.h"
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#include "SparcV9RegClassInfo.h"
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#include "SparcV9Internals.h"
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#include "SparcV9RegInfo.h"
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#include "RegAlloc/RegAllocCommon.h"
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#include "RegAlloc/IGNode.h"
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#include <iostream>
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namespace llvm {
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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 SparcV9IntRegClass::colorIGNode(IGNode * Node,
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const std::vector<bool> &IsColorUsedArr) const
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{
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LiveRange *LR = Node->getParentLR();
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if (DEBUG_RA)
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std::cerr << "\nColoring LR [CallInt=" << LR->isCallInterference() <<"]:"
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<< *LR << "\n";
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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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std::cerr << "\n -Coloring with sug color: " << SugCol;
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LR->setColor(LR->getSuggestedColor());
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return;
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} else if(DEBUG_RA) {
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std::cerr << "\n Couldn't alloc Sug col - LR volatile & calls interf";
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}
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} else if (DEBUG_RA) { // can't allocate the suggested col
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std::cerr << "\n Could NOT allocate the suggested color (already used) "
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<< *LR << "\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 = SparcV9IntRegClass::StartOfAllRegs;
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} else {
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// start with non volatiles (no non-volatiles)
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SearchStart = SparcV9IntRegClass::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 < SparcV9IntRegClass::NumOfAvailRegs; c++) {
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if (!IsColorUsedArr[c]) {
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ColorFound = true;
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break;
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}
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}
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if (ColorFound) {
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LR->setColor(c); // first color found in preferred order
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if (DEBUG_RA) std::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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// start from 0 - try to find even a volatile this time
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SearchStart = SparcV9IntRegClass::StartOfAllRegs;
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// find first unused volatile color
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for(c=SearchStart; c < SparcV9IntRegClass::StartOfNonVolatileRegs; c++) {
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if (! IsColorUsedArr[c]) {
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ColorFound = true;
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break;
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}
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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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if (DEBUG_RA)
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std::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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// Int CC 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 (node has any interferences)
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// /* all interference operations can use only one register! */
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// mark the LR for spilling
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// else {
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// if (the LR is a 64-bit comparison) use %xcc
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// else /*32-bit or smaller*/ use %icc
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// }
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//
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// Note: The third name (%ccr) is essentially an assembly mnemonic and
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// depends solely on the opcode, so the name can be chosen in EmitAssembly.
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//-----------------------------------------------------------------------------
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void SparcV9IntCCRegClass::colorIGNode(IGNode *Node,
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const std::vector<bool> &IsColorUsedArr) const
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{
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if (Node->getNumOfNeighbors() > 0)
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Node->getParentLR()->markForSpill();
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// Mark the appropriate register in any case (even if it needs to be spilled)
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// because there is only one possible register, but more importantly, the
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// spill algorithm cannot find it. In particular, we have to choose
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// whether to use %xcc or %icc based on type of value compared
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//
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const LiveRange* ccLR = Node->getParentLR();
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const Type* setCCType = (* ccLR->begin())->getType(); // any Value in LR
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assert(setCCType->isIntegral() || isa<PointerType>(setCCType));
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int ccReg = ((isa<PointerType>(setCCType) || setCCType == Type::LongTy)
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? xcc : icc);
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#ifndef NDEBUG
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// Let's just make sure values of two different types have not been
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// coalesced into this LR.
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for (LiveRange::const_iterator I=ccLR->begin(), E=ccLR->end(); I!=E; ++I) {
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const Type* ccType = (*I)->getType();
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assert((ccReg == xcc && (isa<PointerType>(ccType)
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|| ccType == Type::LongTy)) ||
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(ccReg == icc && ccType->isIntegral() && ccType != Type::LongTy)
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&& "Comparisons needing different intCC regs coalesced in LR!");
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}
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#endif
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Node->setColor(ccReg); // only one int cc reg is available
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}
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void SparcV9FloatCCRegClass::colorIGNode(IGNode *Node,
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const std::vector<bool> &IsColorUsedArr) const {
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for(unsigned c = 0; c != 4; ++c)
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if (!IsColorUsedArr[c]) { // find unused color
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Node->setColor(c);
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return;
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}
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Node->getParentLR()->markForSpill();
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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 SparcV9FloatRegClass::colorIGNode(IGNode * Node,
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const std::vector<bool> &IsColorUsedArr) const
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{
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LiveRange *LR = Node->getParentLR();
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#ifndef NDEBUG
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// Check that the correct colors have been are marked for fp-doubles.
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//
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// FIXME: This is old code that is no longer needed. Temporarily converting
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// it into a big assertion just to check that the replacement logic
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// (invoking SparcV9FloatRegClass::markColorsUsed() directly from
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// RegClass::colorIGNode) works correctly.
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//
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// In fact, this entire function should be identical to
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// SparcV9IntRegClass::colorIGNode(), and perhaps can be
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// made into a general case in CodeGen/RegAlloc/RegClass.cpp.
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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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assert(IsColorUsedArr[ NeighLR->getColor() ]);
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if (NeighLR->getType() == Type::DoubleTy)
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assert(IsColorUsedArr[ NeighLR->getColor()+1 ]);
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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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assert(IsColorUsedArr[ NeighLR->getSuggestedColor() ]);
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if (NeighLR->getType() == Type::DoubleTy)
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assert(IsColorUsedArr[ NeighLR->getSuggestedColor()+1 ]);
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}
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}
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#endif
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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 SparcV9IntRegClass::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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std::cerr << " Could NOT allocate the suggested color for LR " << *LR
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<< "\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 because 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 = SparcV9FloatRegClass::StartOfAllRegs;
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} else {
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// start with non volatiles (no non-volatiles)
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SearchStart = SparcV9FloatRegClass::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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} 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, SparcV9FloatRegClass::StartOfAllRegs,
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SparcV9FloatRegClass::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 preferred order
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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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// This method marks the registers used for a given register number.
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// This marks a single register for Float regs, but the R,R+1 pair
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// for double-precision registers.
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//-----------------------------------------------------------------------------
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void SparcV9FloatRegClass::markColorsUsed(unsigned RegInClass,
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int UserRegType,
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int RegTypeWanted,
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std::vector<bool> &IsColorUsedArr) const
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{
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if (UserRegType == SparcV9RegInfo::FPDoubleRegType ||
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RegTypeWanted == SparcV9RegInfo::FPDoubleRegType) {
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// This register is used as or is needed as a double-precision reg.
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// We need to mark the [even,odd] pair corresponding to this reg.
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// Get the even numbered register corresponding to this reg.
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unsigned EvenRegInClass = RegInClass & ~1u;
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assert(EvenRegInClass+1 < NumOfAllRegs &&
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EvenRegInClass+1 < IsColorUsedArr.size());
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IsColorUsedArr[EvenRegInClass] = true;
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IsColorUsedArr[EvenRegInClass+1] = true;
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}
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else {
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assert(RegInClass < NumOfAllRegs && RegInClass < IsColorUsedArr.size());
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assert(UserRegType == RegTypeWanted
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&& "Something other than FP single/double types share a reg class?");
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IsColorUsedArr[RegInClass] = true;
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}
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}
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// This method finds unused registers of the specified register type,
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// using the given "used" flag array IsColorUsedArr. It checks a single
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// entry in the array directly for float regs, and checks the pair [R,R+1]
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// for double-precision registers
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// It returns -1 if no unused color is found.
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//
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int SparcV9FloatRegClass::findUnusedColor(int RegTypeWanted,
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const std::vector<bool> &IsColorUsedArr) const
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{
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if (RegTypeWanted == SparcV9RegInfo::FPDoubleRegType) {
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unsigned NC = 2 * this->getNumOfAvailRegs();
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assert(IsColorUsedArr.size() == NC && "Invalid colors-used array");
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for (unsigned c = 0; c < NC; c+=2)
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if (!IsColorUsedArr[c]) {
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assert(!IsColorUsedArr[c+1] && "Incorrect used regs for FP double!");
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return c;
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}
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return -1;
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}
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else
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return TargetRegClassInfo::findUnusedColor(RegTypeWanted, IsColorUsedArr);
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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 SparcV9FloatRegClass::findFloatColor(const LiveRange *LR,
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unsigned Start,
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unsigned End,
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const std::vector<bool> &IsColorUsedArr) const
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{
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if (LR->getType() == Type::DoubleTy) {
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// find first unused color for a double
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assert(Start % 2 == 0 && "Odd register number could be used for double!");
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for (unsigned c=Start; c < End ; c+= 2)
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if (!IsColorUsedArr[c]) {
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assert(!IsColorUsedArr[c+1] &&
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"Incorrect marking of used regs for SparcV9 FP double!");
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return c;
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}
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} else {
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// find first unused color for a single
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for (unsigned 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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} // End llvm namespace
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