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Split unroll prepare into separate pass

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This commit is contained in:
jespergravgaard 2018-08-21 10:01:09 +02:00
parent b19bf2246e
commit 4f23ed5079
3 changed files with 131 additions and 49 deletions
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1
src/main/java/dk/camelot64/kickc/Compiler.java
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@ -222,6 +222,7 @@ public class Compiler {
loopUnrolling.add(new Pass3StatementInfos(program));
loopUnrolling.add(new Pass2DominatorsAnalysis(program));
loopUnrolling.add(new Pass2LoopAnalysis(program));
loopUnrolling.add(new Pass2LoopUnrollPhiPrepare(program));
loopUnrolling.add(new Pass2LoopUnroll(program));
pass2OptimizeSSA(loopUnrolling);
}

52
src/main/java/dk/camelot64/kickc/passes/Pass2LoopUnroll.java
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@ -3,7 +3,6 @@ package dk.camelot64.kickc.passes;
import dk.camelot64.kickc.model.*;
import dk.camelot64.kickc.model.statements.Statement;
import dk.camelot64.kickc.model.statements.StatementConditionalJump;
import dk.camelot64.kickc.model.statements.StatementInfos;
import dk.camelot64.kickc.model.statements.StatementPhiBlock;
import dk.camelot64.kickc.model.symbols.Label;
import dk.camelot64.kickc.model.symbols.Variable;
@ -25,7 +24,7 @@ public class Pass2LoopUnroll extends Pass2SsaOptimization {
public boolean step() {
// Look for loops to unroll
NaturalLoopSet loops = getProgram().getLoopSet();
List<NaturalLoop> unrollLoopCandidates = findUnrollLoopCandidates(loops);
List<NaturalLoop> unrollLoopCandidates = findUnrollLoopCandidates(getProgram(), loops);
// Is there any unrolling to do?
if(unrollLoopCandidates.isEmpty()) {
return false;
@ -82,51 +81,6 @@ public class Pass2LoopUnroll extends Pass2SsaOptimization {
loopSuccessorPredecessors.add(block.getLabel());
}
}
// - Add any needed PHI-statements to the successors
StatementInfos statementInfos = getProgram().getStatementInfos();
for(VariableRef definedVarRef : definedToNewVar.keySet()) {
// Find out if the variable is ever referenced outside the loop
boolean referencedOutsideLoop = false;
Collection<Integer> varRefStatements = variableReferenceInfos.getVarRefStatements(definedVarRef);
for(Integer varRefStatement : varRefStatements) {
ControlFlowBlock refBlock = statementInfos.getBlock(varRefStatement);
if(!unrollLoop.getBlocks().contains(refBlock.getLabel())) {
referencedOutsideLoop = true;
break;
}
}
if(referencedOutsideLoop) {
for(int i = 0; i < loopSuccessors.size(); i++) {
LabelRef successorBlockRef = loopSuccessors.get(i);
LabelRef successorPredecessorRef = loopSuccessorPredecessors.get(i);
ControlFlowBlock successorBlock = getGraph().getBlock(successorBlockRef);
StatementPhiBlock phiBlock = successorBlock.getPhiBlock();
// Look for a phi-variable
boolean phiFound = false;
for(StatementPhiBlock.PhiVariable phiVariable : phiBlock.getPhiVariables()) {
if(phiVariable.getVariable().isVersion() && definedVarRef.isVersion()) {
if(phiVariable.getVariable().getFullNameUnversioned().equals(definedVarRef.getFullNameUnversioned())) {
phiFound = true;
}
}
}
if(!phiFound) {
Variable definedVar = getScope().getVariable(definedVarRef);
Variable newVar = ((VariableVersion) definedVar).getVersionOf().createVersion();
StatementPhiBlock.PhiVariable newPhiVar = phiBlock.addPhiVariable(newVar.getRef());
newPhiVar.setrValue(successorPredecessorRef, definedVarRef);
getLog().append("Missing PHI for " + definedVarRef.getFullName() + " in block " + successorBlock.getLabel() + " - " + phiBlock.toString(getProgram(), false));
// TODO: Replace all references to definedVarRef outside loop to newVar!
}
}
}
}
getLog().append(getGraph().toString(getProgram()));
// 1. Copy all loop blocks to create the "rest of the loop" and modifying the existing loop to only be the first iteration)
// - Unroll Statements (copy all statements, replace symbols properly (with the new versions / the versions assigned in the existing loop)
@ -203,9 +157,9 @@ public class Pass2LoopUnroll extends Pass2SsaOptimization {
* @param loops All loops identified in the program
* @return All loops declared to be unrolled
*/
private List<NaturalLoop> findUnrollLoopCandidates(NaturalLoopSet loops) {
static List<NaturalLoop> findUnrollLoopCandidates(Program program, NaturalLoopSet loops) {
List<NaturalLoop> unrollLoopCandidates = new ArrayList<>();
for(ControlFlowBlock block : getGraph().getAllBlocks()) {
for(ControlFlowBlock block : program.getGraph().getAllBlocks()) {
for(Statement statement : block.getStatements()) {
if(statement instanceof StatementConditionalJump) {
if(((StatementConditionalJump) statement).isDeclaredUnroll()) {

127
src/main/java/dk/camelot64/kickc/passes/Pass2LoopUnrollPhiPrepare.java Normal file
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@ -0,0 +1,127 @@
package dk.camelot64.kickc.passes;
import dk.camelot64.kickc.model.*;
import dk.camelot64.kickc.model.statements.Statement;
import dk.camelot64.kickc.model.statements.StatementInfos;
import dk.camelot64.kickc.model.statements.StatementPhiBlock;
import dk.camelot64.kickc.model.symbols.Variable;
import dk.camelot64.kickc.model.symbols.VariableVersion;
import dk.camelot64.kickc.model.values.LabelRef;
import dk.camelot64.kickc.model.values.VariableRef;
import java.util.*;
/**
* Prepare for unrolling loops declared as inline.
* This is done byensuring that all variables defined inside the loops and used outside the loop is passed through a PHI-functions
* upon loop exit thus ensuring that these variables are only used inside the loop and in the PHI-function.
* This makes it much easier to perform the unrolling as only a few parts of the program must be modified.
*/
public class Pass2LoopUnrollPhiPrepare extends Pass2SsaOptimization {
public Pass2LoopUnrollPhiPrepare(Program program) {
super(program);
}
@Override
public boolean step() {
// Look for loops to unroll
NaturalLoopSet loops = getProgram().getLoopSet();
List<NaturalLoop> unrollLoopCandidates = Pass2LoopUnroll.findUnrollLoopCandidates(getProgram(), loops);
// Is there any unrolling to do?
if(unrollLoopCandidates.isEmpty()) {
return false;
}
VariableReferenceInfos variableReferenceInfos = getProgram().getVariableReferenceInfos();
for(NaturalLoop unrollLoop : unrollLoopCandidates) {
List<ControlFlowBlock> unrollBlocks = new ArrayList<>();
for(ControlFlowBlock block : getProgram().getGraph().getAllBlocks()) {
if(unrollLoop.getBlocks().contains(block.getLabel())) {
unrollBlocks.add(block);
}
}
List<VariableRef> definedInLoop = new ArrayList<>();
for(ControlFlowBlock block : unrollBlocks) {
for(Statement statement : block.getStatements()) {
Collection<VariableRef> definedVars = variableReferenceInfos.getDefinedVars(statement);
for(VariableRef definedVarRef : definedVars) {
definedInLoop.add(definedVarRef);
getLog().append("Defined in loop: " + definedVarRef.getFullName());
}
}
}
// - Ensure that all variables assigned inside the loop has a PHI in successor blocks to the loop
// - Find loop successor blocks
List<LabelRef> loopSuccessors = new ArrayList<>();
List<LabelRef> loopSuccessorPredecessors = new ArrayList<>();
for(ControlFlowBlock block : unrollBlocks) {
if(block.getDefaultSuccessor() != null && !unrollLoop.getBlocks().contains(block.getDefaultSuccessor())) {
// Default successor is outside
loopSuccessors.add(block.getDefaultSuccessor());
loopSuccessorPredecessors.add(block.getLabel());
}
if(block.getConditionalSuccessor() != null && !unrollLoop.getBlocks().contains(block.getConditionalSuccessor())) {
// Default successor is outside
loopSuccessors.add(block.getConditionalSuccessor());
loopSuccessorPredecessors.add(block.getLabel());
}
}
// - Add any needed PHI-statements to the successors
StatementInfos statementInfos = getProgram().getStatementInfos();
for(VariableRef definedVarRef : definedInLoop) {
// Find out if the variable is ever referenced outside the loop
boolean referencedOutsideLoop = false;
Collection<Integer> varRefStatements = variableReferenceInfos.getVarRefStatements(definedVarRef);
for(Integer varRefStatement : varRefStatements) {
ControlFlowBlock refBlock = statementInfos.getBlock(varRefStatement);
if(!unrollLoop.getBlocks().contains(refBlock.getLabel())) {
referencedOutsideLoop = true;
break;
}
}
if(referencedOutsideLoop) {
for(int i = 0; i < loopSuccessors.size(); i++) {
LabelRef successorBlockRef = loopSuccessors.get(i);
LabelRef successorPredecessorRef = loopSuccessorPredecessors.get(i);
ControlFlowBlock successorBlock = getGraph().getBlock(successorBlockRef);
StatementPhiBlock phiBlock = successorBlock.getPhiBlock();
// Look for a phi-variable
boolean phiFound = false;
for(StatementPhiBlock.PhiVariable phiVariable : phiBlock.getPhiVariables()) {
if(phiVariable.getVariable().isVersion() && definedVarRef.isVersion()) {
if(phiVariable.getVariable().getFullNameUnversioned().equals(definedVarRef.getFullNameUnversioned())) {
phiFound = true;
}
}
}
if(!phiFound) {
Variable definedVar = getScope().getVariable(definedVarRef);
Variable newVar = ((VariableVersion) definedVar).getVersionOf().createVersion();
StatementPhiBlock.PhiVariable newPhiVar = phiBlock.addPhiVariable(newVar.getRef());
newPhiVar.setrValue(successorPredecessorRef, definedVarRef);
getLog().append("Missing PHI for " + definedVarRef.getFullName() + " in block " + successorBlock.getLabel() + " - " + phiBlock.toString(getProgram(), false));
// TODO: Replace all references to definedVarRef outside loop to newVar!
}
}
}
}
}
getLog().append(getGraph().toString(getProgram()));
return false;
}
}