Ryujinx/ARMeilleure/CodeGen/Optimizations/ConstantFolding.cs
LDj3SNuD c050994995
Fix PPTC on Windows 7. (#1369)
* Fix PPTC on Windows 7.

* Address gdkchan comment.
2020-07-09 10:45:24 +10:00

260 lines
No EOL
8.9 KiB
C#

using ARMeilleure.IntermediateRepresentation;
using System;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
namespace ARMeilleure.CodeGen.Optimizations
{
static class ConstantFolding
{
public static void RunPass(Operation operation)
{
if (operation.Destination == null || operation.SourcesCount == 0)
{
return;
}
if (!AreAllSourcesConstantAndCFEnabled(operation))
{
return;
}
OperandType type = operation.Destination.Type;
switch (operation.Instruction)
{
case Instruction.Add:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x + y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x + y);
}
break;
case Instruction.BitwiseAnd:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x & y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x & y);
}
break;
case Instruction.BitwiseExclusiveOr:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x ^ y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x ^ y);
}
break;
case Instruction.BitwiseNot:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => ~x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => ~x);
}
break;
case Instruction.BitwiseOr:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x | y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x | y);
}
break;
case Instruction.Copy:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => x);
}
break;
case Instruction.Divide:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => y != 0 ? x / y : 0);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => y != 0 ? x / y : 0);
}
break;
case Instruction.DivideUI:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => y != 0 ? (int)((uint)x / (uint)y) : 0);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => y != 0 ? (long)((ulong)x / (ulong)y) : 0);
}
break;
case Instruction.Multiply:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x * y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x * y);
}
break;
case Instruction.Negate:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => -x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => -x);
}
break;
case Instruction.ShiftLeft:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x << y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x << (int)y);
}
break;
case Instruction.ShiftRightSI:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x >> y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x >> (int)y);
}
break;
case Instruction.ShiftRightUI:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => (int)((uint)x >> y));
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => (long)((ulong)x >> (int)y));
}
break;
case Instruction.SignExtend16:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => (short)x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => (short)x);
}
break;
case Instruction.SignExtend32:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => (int)x);
}
break;
case Instruction.SignExtend8:
if (type == OperandType.I32)
{
EvaluateUnaryI32(operation, (x) => (sbyte)x);
}
else if (type == OperandType.I64)
{
EvaluateUnaryI64(operation, (x) => (sbyte)x);
}
break;
case Instruction.Subtract:
if (type == OperandType.I32)
{
EvaluateBinaryI32(operation, (x, y) => x - y);
}
else if (type == OperandType.I64)
{
EvaluateBinaryI64(operation, (x, y) => x - y);
}
break;
}
}
private static bool AreAllSourcesConstantAndCFEnabled(Operation operation)
{
for (int index = 0; index < operation.SourcesCount; index++)
{
Operand srcOp = operation.GetSource(index);
if (srcOp.Kind != OperandKind.Constant || srcOp.Relocatable)
{
return false;
}
}
return true;
}
private static void EvaluateUnaryI32(Operation operation, Func<int, int> op)
{
int x = operation.GetSource(0).AsInt32();
operation.TurnIntoCopy(Const(op(x)));
}
private static void EvaluateUnaryI64(Operation operation, Func<long, long> op)
{
long x = operation.GetSource(0).AsInt64();
operation.TurnIntoCopy(Const(op(x)));
}
private static void EvaluateBinaryI32(Operation operation, Func<int, int, int> op)
{
int x = operation.GetSource(0).AsInt32();
int y = operation.GetSource(1).AsInt32();
operation.TurnIntoCopy(Const(op(x, y)));
}
private static void EvaluateBinaryI64(Operation operation, Func<long, long, long> op)
{
long x = operation.GetSource(0).AsInt64();
long y = operation.GetSource(1).AsInt64();
operation.TurnIntoCopy(Const(op(x, y)));
}
}
}