void VisitGreaterThanOrEqual(HGreaterThanOrEqual* condition) OVERRIDE;
void VisitLessThan(HLessThan* condition) OVERRIDE;
void VisitLessThanOrEqual(HLessThanOrEqual* condition) OVERRIDE;
+ void VisitBelow(HBelow* condition) OVERRIDE;
+ void VisitBelowOrEqual(HBelowOrEqual* condition) OVERRIDE;
+ void VisitAbove(HAbove* condition) OVERRIDE;
+ void VisitAboveOrEqual(HAboveOrEqual* condition) OVERRIDE;
void VisitDiv(HDiv* instruction) OVERRIDE;
void VisitMul(HMul* instruction) OVERRIDE;
void VisitNeg(HNeg* instruction) OVERRIDE;
block->RemoveInstruction(check);
}
+static HCondition* GetOppositeConditionSwapOps(ArenaAllocator* arena, HInstruction* cond) {
+ HInstruction *lhs = cond->InputAt(0);
+ HInstruction *rhs = cond->InputAt(1);
+ switch (cond->GetKind()) {
+ case HInstruction::kEqual:
+ return new (arena) HEqual(rhs, lhs);
+ case HInstruction::kNotEqual:
+ return new (arena) HNotEqual(rhs, lhs);
+ case HInstruction::kLessThan:
+ return new (arena) HGreaterThan(rhs, lhs);
+ case HInstruction::kLessThanOrEqual:
+ return new (arena) HGreaterThanOrEqual(rhs, lhs);
+ case HInstruction::kGreaterThan:
+ return new (arena) HLessThan(rhs, lhs);
+ case HInstruction::kGreaterThanOrEqual:
+ return new (arena) HLessThanOrEqual(rhs, lhs);
+ case HInstruction::kBelow:
+ return new (arena) HAbove(rhs, lhs);
+ case HInstruction::kBelowOrEqual:
+ return new (arena) HAboveOrEqual(rhs, lhs);
+ case HInstruction::kAbove:
+ return new (arena) HBelow(rhs, lhs);
+ case HInstruction::kAboveOrEqual:
+ return new (arena) HBelowOrEqual(rhs, lhs);
+ default:
+ LOG(FATAL) << "Unknown ConditionType " << cond->GetKind();
+ }
+ return nullptr;
+}
+
void InstructionSimplifierVisitor::VisitEqual(HEqual* equal) {
HInstruction* input_const = equal->GetConstantRight();
if (input_const != nullptr) {
VisitCondition(condition);
}
-// TODO: unsigned comparisons too?
+void InstructionSimplifierVisitor::VisitBelow(HBelow* condition) {
+ VisitCondition(condition);
+}
+
+void InstructionSimplifierVisitor::VisitBelowOrEqual(HBelowOrEqual* condition) {
+ VisitCondition(condition);
+}
+
+void InstructionSimplifierVisitor::VisitAbove(HAbove* condition) {
+ VisitCondition(condition);
+}
+
+void InstructionSimplifierVisitor::VisitAboveOrEqual(HAboveOrEqual* condition) {
+ VisitCondition(condition);
+}
void InstructionSimplifierVisitor::VisitCondition(HCondition* condition) {
- // Try to fold an HCompare into this HCondition.
+ // Reverse condition if left is constant. Our code generators prefer constant
+ // on the right hand side.
+ if (condition->GetLeft()->IsConstant() && !condition->GetRight()->IsConstant()) {
+ HBasicBlock* block = condition->GetBlock();
+ HCondition* replacement = GetOppositeConditionSwapOps(block->GetGraph()->GetArena(), condition);
+ // If it is a fp we must set the opposite bias.
+ if (replacement != nullptr) {
+ if (condition->IsLtBias()) {
+ replacement->SetBias(ComparisonBias::kGtBias);
+ } else if (condition->IsGtBias()) {
+ replacement->SetBias(ComparisonBias::kLtBias);
+ }
+ block->ReplaceAndRemoveInstructionWith(condition, replacement);
+ RecordSimplification();
+
+ condition = replacement;
+ }
+ }
HInstruction* left = condition->GetLeft();
HInstruction* right = condition->GetRight();
+
+ // Try to fold an HCompare into this HCondition.
+
// We can only replace an HCondition which compares a Compare to 0.
// Both 'dx' and 'jack' generate a compare to 0 when compiling a
// condition with a long, float or double comparison as input.
bool IsGtBias() const { return bias_ == ComparisonBias::kGtBias; }
+ bool IsLtBias() const { return bias_ == ComparisonBias::kLtBias; }
+
void SetBias(ComparisonBias bias) { bias_ = bias; }
bool InstructionDataEquals(HInstruction* other) const OVERRIDE {
bool IsFPConditionTrueIfNaN() const {
DCHECK(Primitive::IsFloatingPointType(InputAt(0)->GetType()));
IfCondition if_cond = GetCondition();
- return IsGtBias() ? ((if_cond == kCondGT) || (if_cond == kCondGE)) : (if_cond == kCondNE);
+ if (if_cond == kCondNE) {
+ return true;
+ } else if (if_cond == kCondEQ) {
+ return false;
+ }
+ return ((if_cond == kCondGT) || (if_cond == kCondGE)) && IsGtBias();
}
bool IsFPConditionFalseIfNaN() const {
DCHECK(Primitive::IsFloatingPointType(InputAt(0)->GetType()));
IfCondition if_cond = GetCondition();
- return IsGtBias() ? ((if_cond == kCondLT) || (if_cond == kCondLE)) : (if_cond == kCondEQ);
+ if (if_cond == kCondEQ) {
+ return true;
+ } else if (if_cond == kCondNE) {
+ return false;
+ }
+ return ((if_cond == kCondLT) || (if_cond == kCondLE)) && IsGtBias();
}
private:
return ((d > 42.0) != false) ? 13 : 54;
}
+ /// CHECK-START: int Main.intReverseCondition(int) instruction_simplifier (before)
+ /// CHECK-DAG: <<Arg:i\d+>> ParameterValue
+ /// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
+ /// CHECK-DAG: <<LE>> LessThanOrEqual [<<Const42>>,<<Arg>>]
+
+ /// CHECK-START: int Main.intReverseCondition(int) instruction_simplifier (after)
+ /// CHECK-DAG: <<Arg:i\d+>> ParameterValue
+ /// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
+ /// CHECK-DAG: <<GE>> GreaterThanOrEqual [<<Arg>>,<<Const42>>]
+
+ public static int intReverseCondition(int i) {
+ return (42 > i) ? 13 : 54;
+ }
+
+ /// CHECK-START: int Main.intReverseConditionNaN(int) instruction_simplifier (before)
+ /// CHECK-DAG: <<Arg:i\d+>> ParameterValue
+ /// CHECK-DAG: <<Const42:d\d+>> DoubleConstant 42
+ /// CHECK-DAG: <<ResDouble>> InvokeStaticOrDirect [<<Arg>>]
+ /// CHECK-DAG: <<CMP>> Compare [<<Const42>>,<<ResDouble>>]
+
+ /// CHECK-START: int Main.intReverseConditionNaN(int) instruction_simplifier (after)
+ /// CHECK-DAG: <<Arg:i\d+>> ParameterValue
+ /// CHECK-DAG: <<Const42:d\d+>> DoubleConstant 42
+ /// CHECK-DAG: <<ResDouble>> InvokeStaticOrDirect [<<Arg>>]
+ /// CHECK-DAG: <<EQ>> Equal [<<ResDouble>>,<<Const42>>]
+
+ public static int intReverseConditionNaN(int i) {
+ return (42 != Math.sqrt(i)) ? 13 : 54;
+ }
+
public static void main(String[] args) {
int arg = 123456;
assertIntEquals(floatConditionNotEqualOne(43.0f), 13);
assertIntEquals(doubleConditionEqualZero(6.0), 54);
assertIntEquals(doubleConditionEqualZero(43.0), 13);
+ assertIntEquals(intReverseCondition(41), 13);
+ assertIntEquals(intReverseConditionNaN(-5), 13);
}
public static boolean booleanField;