-// $Id$
-//***************************************************************************
-// File:
-// Sparc.cpp
-//
-// Purpose:
-//
-// History:
-// 7/15/01 - Vikram Adve - Created
-//**************************************************************************/
-
+//===-- Sparc.cpp - General implementation file for the Sparc Target ------===//
+//
+// This file contains the code for the Sparc Target that does not fit in any of
+// the other files in this directory.
+//
+//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Target/Sparc.h"
-#include "llvm/CodeGen/InstrScheduling.h"
-#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/CodeGen/PhyRegAlloc.h"
-#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
-#include "llvm/Method.h"
-
+#include "llvm/Function.h"
+#include "llvm/BasicBlock.h"
+#include "llvm/CodeGen/MachineCodeForMethod.h"
+#include <iostream>
+using std::cerr;
// Build the MachineInstruction Description Array...
const MachineInstrDescriptor SparcMachineInstrDesc[] = {
// allocateSparcTargetMachine - Allocate and return a subclass of TargetMachine
// that implements the Sparc backend. (the llvm/CodeGen/Sparc.h interface)
//----------------------------------------------------------------------------
-//
TargetMachine *allocateSparcTargetMachine() { return new UltraSparc(); }
-//----------------------------------------------------------------------------
-// Entry point for register allocation for a module
-//----------------------------------------------------------------------------
-
-void AllocateRegisters(Method *M, TargetMachine &target)
-{
-
- if ( (M)->isExternal() ) // don't process prototypes
- return;
-
- if( DEBUG_RA ) {
- cerr << endl << "******************** Method "<< (M)->getName();
- cerr << " ********************" <<endl;
- }
-
- MethodLiveVarInfo LVI(M ); // Analyze live varaibles
- LVI.analyze();
-
-
- PhyRegAlloc PRA(M, target, &LVI); // allocate registers
- PRA.allocateRegisters();
-
-
- if( DEBUG_RA ) cerr << endl << "Register allocation complete!" << endl;
-
-}
-
-
-// Initialize the required area of the stack frame.
-static void
-InitializeFrameLayout(Method *method, TargetMachine &target)
-{
- int minFrameSize = ((UltraSparc&) target).getFrameInfo().MinStackFrameSize;
- method->getMachineCode().incrementStackSize(minFrameSize);
-}
-
-//---------------------------------------------------------------------------
-// Function InsertPrologCode
-// Function InsertEpilogCode
-// Function InsertPrologEpilog
-//
-// Insert prolog code at the unique method entry point.
-// Insert epilog code at each method exit point.
-// InsertPrologEpilog invokes these only if the method is not compiled
-// with the leaf method optimization.
-//---------------------------------------------------------------------------
-
-static MachineInstr* minstrVec[MAX_INSTR_PER_VMINSTR];
-
-static void
-InsertPrologCode(Method* method, TargetMachine& target)
-{
- BasicBlock* entryBB = method->getEntryNode();
- unsigned N = GetInstructionsForProlog(entryBB, target, minstrVec);
- assert(N <= MAX_INSTR_PER_VMINSTR);
- if (N > 0)
- {
- MachineCodeForBasicBlock& bbMvec = entryBB->getMachineInstrVec();
- bbMvec.insert(bbMvec.begin(), minstrVec, minstrVec+N);
- }
-}
-
-
-static void
-InsertEpilogCode(Method* method, TargetMachine& target)
-{
- for (Method::iterator I=method->begin(), E=method->end(); I != E; ++I)
- if ((*I)->getTerminator()->getOpcode() == Instruction::Ret)
- {
- BasicBlock* exitBB = *I;
- unsigned N = GetInstructionsForEpilog(exitBB, target, minstrVec);
-
- MachineCodeForBasicBlock& bbMvec = exitBB->getMachineInstrVec();
- MachineCodeForVMInstr& termMvec =
- exitBB->getTerminator()->getMachineInstrVec();
-
- // Remove the NOPs in the delay slots of the return instruction
- const MachineInstrInfo& mii = target.getInstrInfo();
- unsigned numNOPs = 0;
- while (termMvec.back()->getOpCode() == NOP)
- {
- assert( termMvec.back() == bbMvec.back());
- termMvec.pop_back();
- bbMvec.pop_back();
- ++numNOPs;
- }
- assert(termMvec.back() == bbMvec.back());
-
- // Check that we found the right number of NOPs and have the right
- // number of instructions to replace them.
- unsigned ndelays = mii.getNumDelaySlots(termMvec.back()->getOpCode());
- assert(numNOPs == ndelays && "Missing NOPs in delay slots?");
- assert(N == ndelays && "Cannot use epilog code for delay slots?");
-
- // Append the epilog code to the end of the basic block.
- bbMvec.push_back(minstrVec[0]);
- }
-}
-
-
-// Insert SAVE/RESTORE instructions for the method
-static void
-InsertPrologEpilog(Method *method, TargetMachine &target)
-{
- MachineCodeForMethod& mcodeInfo = method->getMachineCode();
- if (mcodeInfo.isCompiledAsLeafMethod())
- return; // nothing to do
-
- InsertPrologCode(method, target);
- InsertEpilogCode(method, target);
-}
-
-
-//---------------------------------------------------------------------------
-// class UltraSparcSchedInfo
-//
-// Purpose:
-// Scheduling information for the UltraSPARC.
-// Primarily just initializes machine-dependent parameters in
-// class MachineSchedInfo.
-//---------------------------------------------------------------------------
-
-/*ctor*/
-UltraSparcSchedInfo::UltraSparcSchedInfo(const MachineInstrInfo* mii)
- : MachineSchedInfo((unsigned int) SPARC_NUM_SCHED_CLASSES,
- mii,
- SparcRUsageDesc,
- SparcInstrUsageDeltas,
- SparcInstrIssueDeltas,
- sizeof(SparcInstrUsageDeltas)/sizeof(InstrRUsageDelta),
- sizeof(SparcInstrIssueDeltas)/sizeof(InstrIssueDelta))
-{
- maxNumIssueTotal = 4;
- longestIssueConflict = 0; // computed from issuesGaps[]
-
- branchMispredictPenalty = 4; // 4 for SPARC IIi
- branchTargetUnknownPenalty = 2; // 2 for SPARC IIi
- l1DCacheMissPenalty = 8; // 7 or 9 for SPARC IIi
- l1ICacheMissPenalty = 8; // ? for SPARC IIi
-
- inOrderLoads = true; // true for SPARC IIi
- inOrderIssue = true; // true for SPARC IIi
- inOrderExec = false; // false for most architectures
- inOrderRetire= true; // true for most architectures
-
- // must be called after above parameters are initialized.
- this->initializeResources();
-}
-
-void
-UltraSparcSchedInfo::initializeResources()
-{
- // Compute MachineSchedInfo::instrRUsages and MachineSchedInfo::issueGaps
- MachineSchedInfo::initializeResources();
-
- // Machine-dependent fixups go here. None for now.
-}
-
//---------------------------------------------------------------------------
// class UltraSparcFrameInfo
//
// Purpose:
// Interface to stack frame layout info for the UltraSPARC.
-// Note that there is no machine-independent interface to this information
+// Starting offsets for each area of the stack frame are aligned at
+// a multiple of getStackFrameSizeAlignment().
//---------------------------------------------------------------------------
int
-UltraSparcFrameInfo::getFirstAutomaticVarOffsetFromFP (const Method* method)
+UltraSparcFrameInfo::getFirstAutomaticVarOffset(MachineCodeForMethod& ,
+ bool& pos) const
{
- return StaticStackAreaOffsetFromFP;
+ pos = false; // static stack area grows downwards
+ return StaticAreaOffsetFromFP;
}
int
-UltraSparcFrameInfo::getRegSpillAreaOffsetFromFP(const Method* method)
+UltraSparcFrameInfo::getRegSpillAreaOffset(MachineCodeForMethod& mcInfo,
+ bool& pos) const
{
- unsigned int autoVarsSize = method->getMachineCode().getAutomaticVarsSize();
- return StaticStackAreaOffsetFromFP + autoVarsSize;
+ mcInfo.freezeAutomaticVarsArea(); // ensure no more auto vars are added
+
+ pos = false; // static stack area grows downwards
+ unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
+ return StaticAreaOffsetFromFP - autoVarsSize;
}
int
-UltraSparcFrameInfo::getFrameSizeBelowDynamicArea(const Method* method)
+UltraSparcFrameInfo::getTmpAreaOffset(MachineCodeForMethod& mcInfo,
+ bool& pos) const
{
- unsigned int optArgsSize =
- method->getMachineCode().getOptionalOutgoingArgsSize();
- return optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
+ mcInfo.freezeAutomaticVarsArea(); // ensure no more auto vars are added
+ mcInfo.freezeSpillsArea(); // ensure no more spill slots are added
+
+ pos = false; // static stack area grows downwards
+ unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
+ unsigned int spillAreaSize = mcInfo.getRegSpillsSize();
+ int offset = autoVarsSize + spillAreaSize;
+ return StaticAreaOffsetFromFP - offset;
}
+int
+UltraSparcFrameInfo::getDynamicAreaOffset(MachineCodeForMethod& mcInfo,
+ bool& pos) const
+{
+ // Dynamic stack area grows downwards starting at top of opt-args area.
+ // The opt-args, required-args, and register-save areas are empty except
+ // during calls and traps, so they are shifted downwards on each
+ // dynamic-size alloca.
+ pos = false;
+ unsigned int optArgsSize = mcInfo.getMaxOptionalArgsSize();
+ if (int extra = optArgsSize % getStackFrameSizeAlignment())
+ optArgsSize += (getStackFrameSizeAlignment() - extra);
+ int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
+ assert((offset - OFFSET) % getStackFrameSizeAlignment() == 0);
+ return offset;
+}
//---------------------------------------------------------------------------
UltraSparc::UltraSparc()
: TargetMachine("UltraSparc-Native"),
- instrInfo(),
- schedInfo(&instrInfo),
- regInfo( this ),
- frameInfo()
+ instrInfo(*this),
+ schedInfo(*this),
+ regInfo(*this),
+ frameInfo(*this),
+ cacheInfo(*this),
+ optInfo(*this)
{
optSizeForSubWordData = 4;
minMemOpWordSize = 8;
maxAtomicMemOpWordSize = 8;
}
-
-void
-ApplyPeepholeOptimizations(Method *method, TargetMachine &target)
-{
- return;
-
- // OptimizeLeafProcedures();
- // DeleteFallThroughBranches();
- // RemoveChainedBranches(); // should be folded with previous
- // RemoveRedundantOps(); // operations with %g0, NOP, etc.
-}
-
-
-
-bool
-UltraSparc::compileMethod(Method *M)
-{
- InitializeFrameLayout(M, *this); // initialize the required area of
- // the stack frame
- if (SelectInstructionsForMethod(M, *this))
- {
- cerr << "Instruction selection failed for method " << M->getName()
- << "\n\n";
- return true;
- }
-
- if (ScheduleInstructionsWithSSA(M, *this))
- {
- cerr << "Instruction scheduling before allocation failed for method "
- << M->getName() << "\n\n";
- return true;
- }
-
- AllocateRegisters(M, *this); // allocate registers
-
- ApplyPeepholeOptimizations(M, *this); // machine-dependent peephole opts
-
- InsertPrologEpilog(M, *this);
-
- return false;
-}
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