public virtual Expression VisitBinaryExpression(BinaryExpression binExp)
{
// (+ id1 id1) ==> (* id1 2)
if (add2ids.Match(binExp))
{
Changed = true;
return(add2ids.Transform().Accept(this));
}
if (binopWithSelf.Match(binExp))
{
Changed = true;
return(binopWithSelf.Transform(ctx).Accept(this));
}
if (distributedConvert.Match(binExp))
{
Changed = true;
return(distributedConvert.Transform(ctx).Accept(this));
}
if (distributedCast.Match(binExp))
{
Changed = true;
return(distributedCast.Transform(ctx).Accept(this));
}
if (distributedSlice.Match(binExp))
{
Changed = true;
return(distributedSlice.Transform(ctx).Accept(this));
}
// (exp >> n) << n => __align(exp, 1<<n)
var eNew = ShiftRightShiftLeft(binExp);
if (eNew != null)
{
Changed = true;
return(eNew);
}
var left = binExp.Left.Accept(this);
var right = binExp.Right.Accept(this);
Constant?cLeft = left as Constant;
Constant?cRight = right as Constant;
if (cLeft != null && BinaryExpression.Commutes(binExp.Operator))
{
cRight = cLeft; left = right; right = cLeft;
}
//$TODO: operands to binary operations appear to be
// mismatched in some processors. Change the ctor
// of BinaryExpression to catch this later.
var sameBitsize = left.DataType.BitSize == right.DataType.BitSize;
if (cRight != null)
{
// (- X 0) ==> X
// (+ X 0) ==> X
if (cRight.IsIntegerZero && IsAddOrSub(binExp.Operator))
{
Changed = true;
return(left);
}
if (binExp.Operator == Operator.Or)
{
if (cRight.IsIntegerZero)
{
Changed = true;
return(left);
}
// (| X 0xFFFF...F) ==> 0xFFFF...F
if (cRight.IsMaxUnsigned && sameBitsize && !CriticalInstruction.IsCritical(left))
{
ctx.RemoveExpressionUse(left);
Changed = true;
return(right);
}
}
if (binExp.Operator == Operator.And)
{
if (cRight.IsIntegerZero && sameBitsize && !CriticalInstruction.IsCritical(left))
{
ctx.RemoveExpressionUse(left);
Changed = true;
return(cRight);
}
if (cRight.IsMaxUnsigned && sameBitsize)
{
Changed = true;
return(left);
}
}
if (binExp.Operator == Operator.Xor)
{
if (cRight.IsIntegerZero)
{
Changed = true;
return(left);
}
if (cRight.IsMaxUnsigned && sameBitsize)
{
Changed = true;
return(new UnaryExpression(Operator.Comp, left.DataType, left).Accept(this));
}
}
}
//$REVIEW: this is evaluation! Shouldn't the be done by the evaluator?
if (left is InvalidConstant || right is InvalidConstant)
{
return(InvalidConstant.Create(binExp.DataType));
}
binExp = new BinaryExpression(binExp.Operator, binExp.DataType, left, right);
if (constConstBin.Match(binExp))
{
Changed = true;
return(constConstBin.Transform());
}
Identifier?idLeft = left as Identifier;
Identifier?idRight = right as Identifier;
// (rel? id1 c) should just pass.
if (IsIntComparison(binExp.Operator) && cRight != null && idLeft != null)
{
return(binExp);
}
// Floating point expressions with "integer" constants
if (IsFloatComparison(binExp.Operator) && IsNonFloatConstant(cRight))
{
cRight = ctx.ReinterpretAsFloat(cRight !);
right = cRight;
binExp = new BinaryExpression(
binExp.Operator,
binExp.DataType,
binExp.Left,
cRight);
}
var binLeft = left as BinaryExpression;
var cLeftRight = (binLeft != null) ? binLeft.Right as Constant : null;
// (+ (+ e c1) c2) ==> (+ e (+ c1 c2))
// (+ (- e c1) c2) ==> (+ e (- c2 c1))
// (- (+ e c1) c2) ==> (- e (- c2 c1))
// (- (- e c1) c2) ==> (- e (+ c1 c2))
if (binLeft != null && cLeftRight != null && cRight != null)
{
if (IsAddOrSub(binExp.Operator) && IsAddOrSub(binLeft.Operator) &&
!cLeftRight.IsReal && !cRight.IsReal)
{
Changed = true;
var binOperator = binExp.Operator;
Constant c;
if (binLeft.Operator == binOperator)
{
c = Operator.IAdd.ApplyConstants(cLeftRight, cRight);
}
else
{
if (Math.Abs(cRight.ToInt64()) >= Math.Abs(cLeftRight.ToInt64()))
{
c = Operator.ISub.ApplyConstants(cRight, cLeftRight);
}
else
{
binOperator =
binOperator == Operator.IAdd
? Operator.ISub
: Operator.IAdd;
c = Operator.ISub.ApplyConstants(cLeftRight, cRight);
}
}
if (c.IsIntegerZero)
{
return(binLeft.Left);
}
return(new BinaryExpression(binOperator, binExp.DataType, binLeft.Left, c));
}
if (binExp.Operator == Operator.IMul && binLeft.Operator == Operator.IMul)
{
Changed = true;
var c = Operator.IMul.ApplyConstants(cLeftRight, cRight);
if (c.IsIntegerZero)
{
return(c);
}
else
{
return(new BinaryExpression(binExp.Operator, binExp.DataType, binLeft.Left, c));
}
}
}
// (rel (- c e) 0 => (rel -c e) => (rel.Negate e c)
if (binLeft != null && cRight != null && cRight.IsIntegerZero &&
IsIntComparison(binExp.Operator) &&
binLeft.Left is Constant cBinLeft &&
binLeft.Operator == Operator.ISub)
{
return(new BinaryExpression(
((ConditionalOperator)binExp.Operator).Negate(),
binExp.DataType,
binLeft.Right,
cBinLeft));
}
// (rel (- e c1) c2) => (rel e c1+c2)
if (binLeft != null && cLeftRight != null && cRight != null &&
IsIntComparison(binExp.Operator) && IsAddOrSub(binLeft.Operator) &&
!cLeftRight.IsReal && !cRight.IsReal)
{
// (>u (- e c1) c2) => (>u e c1+c2) || (<u e c2)
if (binExp.Operator == Operator.Ugt &&
binLeft.Operator == Operator.ISub &&
!cRight.IsIntegerZero)
{
Changed = true;
ctx.UseExpression(binLeft.Left);
var c = ExpressionSimplifier.SimplifyTwoConstants(Operator.IAdd, cLeftRight, cRight);
return(new BinaryExpression(Operator.Cor, PrimitiveType.Bool,
new BinaryExpression(binExp.Operator, PrimitiveType.Bool, binLeft.Left, c),
new BinaryExpression(Operator.Ult, PrimitiveType.Bool, binLeft.Left, cLeftRight)));
}
else
{
Changed = true;
ctx.RemoveIdentifierUse(idLeft !);
var op = binLeft.Operator == Operator.IAdd ? Operator.ISub : Operator.IAdd;
var c = ExpressionSimplifier.SimplifyTwoConstants(op, cLeftRight, cRight);
return(new BinaryExpression(binExp.Operator, PrimitiveType.Bool, binLeft.Left, c));
}
}
// (rel C non-C) => (trans(rel) non-C C)
if (constOnLeft.Match(binExp))
{
Changed = true;
return(constOnLeft.Transform().Accept(this));
}
if (addMici.Match(binExp))
{
Changed = true;
return(addMici.Transform());
}
if (shAdd.Match(binExp))
{
Changed = true;
return(shAdd.Transform());
}
if (shMul.Match(binExp))
{
Changed = true;
return(shMul.Transform());
}
if (shiftShift.Match(binExp))
{
Changed = true;
return(shiftShift.Transform());
}
eNew = ShiftLeftShiftRight(binExp, cRight);
if (eNew != null)
{
Changed = true;
return(eNew);
}
// (-exp == 0) => (exp == 0)
if (unaryNegEqZero.Match(binExp))
{
Changed = true;
return(unaryNegEqZero.Transform());
}
if (logicalNotFromBorrow.Match(binExp))
{
Changed = true;
return(logicalNotFromBorrow.Transform());
}
// No change, just return as is.
return(binExp);
}
public virtual Expression VisitBinaryExpression(BinaryExpression binExp)
{
// (+ id1 id1) ==> (* id1 2)
if (add2ids.Match(binExp))
{
Changed = true;
return(add2ids.Transform().Accept(this));
}
if (binopWithSelf.Match(binExp))
{
Changed = true;
return(binopWithSelf.Transform(ctx).Accept(this));
}
if (distributedCast.Match(binExp))
{
Changed = true;
return(distributedCast.Transform(ctx).Accept(this));
}
if (distributedSlice.Match(binExp))
{
Changed = true;
return(distributedSlice.Transform(ctx).Accept(this));
}
var left = binExp.Left.Accept(this);
var right = binExp.Right.Accept(this);
Constant?cLeft = left as Constant;
Constant?cRight = right as Constant;
if (cLeft != null && BinaryExpression.Commutes(binExp.Operator))
{
cRight = cLeft; left = right; right = cLeft;
}
// (- X 0) ==> X
// (+ X 0) ==> X
if (cRight != null && cRight.IsIntegerZero && IsAddOrSub(binExp.Operator))
{
Changed = true;
return(left);
}
else if (cRight != null && cRight.IsIntegerZero && binExp.Operator == Operator.Or)
{
Changed = true;
return(left);
}
//$REVIEW: this is evaluation! Shouldn't the be done by the evaluator?
if (left == Constant.Invalid || right == Constant.Invalid)
{
return(Constant.Invalid);
}
binExp = new BinaryExpression(binExp.Operator, binExp.DataType, left, right);
if (constConstBin.Match(binExp))
{
Changed = true;
return(constConstBin.Transform());
}
Identifier?idLeft = left as Identifier;
Identifier?idRight = right as Identifier;
// (rel? id1 c) should just pass.
if (IsIntComparison(binExp.Operator) && cRight != null && idLeft != null)
{
return(binExp);
}
// Floating point expressions with "integer" constants
if (IsFloatComparison(binExp.Operator) && IsNonFloatConstant(cRight))
{
cRight = ReinterpretAsIeeeFloat(cRight !);
right = cRight;
binExp = new BinaryExpression(
binExp.Operator,
binExp.DataType,
binExp.Left,
cRight);
}
var binLeft = left as BinaryExpression;
var cLeftRight = (binLeft != null) ? binLeft.Right as Constant : null;
// (+ (+ e c1) c2) ==> (+ e (+ c1 c2))
// (+ (- e c1) c2) ==> (+ e (- c2 c1))
// (- (+ e c1) c2) ==> (- e (- c2 c1))
// (- (- e c1) c2) ==> (- e (+ c1 c2))
if (binLeft != null && cLeftRight != null && cRight != null)
{
if (IsAddOrSub(binExp.Operator) && IsAddOrSub(binLeft.Operator) &&
!cLeftRight.IsReal && !cRight.IsReal)
{
Changed = true;
var binOperator = binExp.Operator;
Constant c;
if (binLeft.Operator == binOperator)
{
c = Operator.IAdd.ApplyConstants(cLeftRight, cRight);
}
else
{
if (Math.Abs(cRight.ToInt64()) >= Math.Abs(cLeftRight.ToInt64()))
{
c = Operator.ISub.ApplyConstants(cRight, cLeftRight);
}
else
{
binOperator =
binOperator == Operator.IAdd
? Operator.ISub
: Operator.IAdd;
c = Operator.ISub.ApplyConstants(cLeftRight, cRight);
}
}
if (c.IsIntegerZero)
{
return(binLeft.Left);
}
return(new BinaryExpression(binOperator, binExp.DataType, binLeft.Left, c));
}
if (binExp.Operator == Operator.IMul && binLeft.Operator == Operator.IMul)
{
Changed = true;
var c = Operator.IMul.ApplyConstants(cLeftRight, cRight);
if (c.IsIntegerZero)
{
return(c);
}
else
{
return(new BinaryExpression(binExp.Operator, binExp.DataType, binLeft.Left, c));
}
}
}
// (rel (- c e) 0 => (rel -c e) => (rel.Negate e c)
if (binLeft != null && cRight != null && cRight.IsIntegerZero &&
IsIntComparison(binExp.Operator) &&
binLeft.Left is Constant cBinLeft &&
binLeft.Operator == Operator.ISub)
{
return(new BinaryExpression(
((ConditionalOperator)binExp.Operator).Negate(),
binExp.DataType,
binLeft.Right,
cBinLeft));
}
// (rel (- e c1) c2) => (rel e c1+c2)
if (binLeft != null && cLeftRight != null && cRight != null &&
IsIntComparison(binExp.Operator) && IsAddOrSub(binLeft.Operator) &&
!cLeftRight.IsReal && !cRight.IsReal)
{
// (>u (- e c1) c2) => (>u e c1+c2) || (<u e c2)
if (binExp.Operator == Operator.Ugt &&
binLeft.Operator == Operator.ISub &&
!cRight.IsIntegerZero)
{
Changed = true;
ctx.UseExpression(binLeft.Left);
var c = ExpressionSimplifier.SimplifyTwoConstants(Operator.IAdd, cLeftRight, cRight);
return(new BinaryExpression(Operator.Cor, PrimitiveType.Bool,
new BinaryExpression(binExp.Operator, PrimitiveType.Bool, binLeft.Left, c),
new BinaryExpression(Operator.Ult, PrimitiveType.Bool, binLeft.Left, cLeftRight)));
}
else
{
Changed = true;
ctx.RemoveIdentifierUse(idLeft !);
var op = binLeft.Operator == Operator.IAdd ? Operator.ISub : Operator.IAdd;
var c = ExpressionSimplifier.SimplifyTwoConstants(op, cLeftRight, cRight);
return(new BinaryExpression(binExp.Operator, PrimitiveType.Bool, binLeft.Left, c));
}
}
// (rel C non-C) => (trans(rel) non-C C)
if (constOnLeft.Match(binExp))
{
Changed = true;
return(constOnLeft.Transform().Accept(this));
}
if (addMici.Match(binExp))
{
Changed = true;
return(addMici.Transform());
}
if (shAdd.Match(binExp))
{
Changed = true;
return(shAdd.Transform());
}
if (shMul.Match(binExp))
{
Changed = true;
return(shMul.Transform());
}
if (shiftShift.Match(binExp))
{
Changed = true;
return(shiftShift.Transform());
}
// (-exp == 0) => (exp == 0)
if (unaryNegEqZero.Match(binExp))
{
Changed = true;
return(unaryNegEqZero.Transform());
}
if (logicalNotFromBorrow.Match(binExp))
{
Changed = true;
return(logicalNotFromBorrow.Transform());
}
// No change, just return as is.
return(binExp);
}