ryujinx/Ryujinx.Graphics.Shader/Instructions/InstEmitFlowControl.cs
gdkchan a7109c767b
Rewrite shader decoding stage (#2698)
* Rewrite shader decoding stage

* Fix P2R constant buffer encoding

* Fix PSET/PSETP

* PR feedback

* Log unimplemented shader instructions

* Implement NOP

* Remove using

* PR feedback
2021-10-12 22:35:31 +02:00

238 lines
7.4 KiB
C#

using Ryujinx.Graphics.Shader.Decoders;
using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using Ryujinx.Graphics.Shader.Translation;
using System.Collections.Generic;
using System.Linq;
using static Ryujinx.Graphics.Shader.Instructions.InstEmitHelper;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Instructions
{
static partial class InstEmit
{
public static void Bra(EmitterContext context)
{
InstBra op = context.GetOp<InstBra>();
EmitBranch(context, context.CurrBlock.Successors[^1].Address);
}
public static void Brk(EmitterContext context)
{
InstBrk op = context.GetOp<InstBrk>();
EmitBrkOrSync(context);
}
public static void Brx(EmitterContext context)
{
InstBrx op = context.GetOp<InstBrx>();
InstOp currOp = context.CurrOp;
int startIndex = context.CurrBlock.HasNext() ? 1 : 0;
if (context.CurrBlock.Successors.Count <= startIndex)
{
context.Config.GpuAccessor.Log($"Failed to find targets for BRX instruction at 0x{currOp.Address:X}.");
return;
}
int offset = (int)currOp.GetAbsoluteAddress();
Operand address = context.IAdd(Register(op.SrcA, RegisterType.Gpr), Const(offset));
// Sorting the target addresses in descending order improves the code,
// since it will always check the most distant targets first, then the
// near ones. This can be easily transformed into if/else statements.
var sortedTargets = context.CurrBlock.Successors.Skip(startIndex).OrderByDescending(x => x.Address);
Block lastTarget = sortedTargets.LastOrDefault();
foreach (Block possibleTarget in sortedTargets)
{
Operand label = context.GetLabel(possibleTarget.Address);
if (possibleTarget != lastTarget)
{
context.BranchIfTrue(label, context.ICompareEqual(address, Const((int)possibleTarget.Address)));
}
else
{
context.Branch(label);
}
}
}
public static void Cal(EmitterContext context)
{
InstCal op = context.GetOp<InstCal>();
context.Call(context.GetFunctionId(context.CurrOp.GetAbsoluteAddress()), false);
}
public static void Exit(EmitterContext context)
{
InstExit op = context.GetOp<InstExit>();
if (context.IsNonMain)
{
context.Config.GpuAccessor.Log("Invalid exit on non-main function.");
return;
}
// TODO: Figure out how this is supposed to work in the
// presence of other condition codes.
if (op.Ccc == Ccc.T)
{
context.Return();
}
}
public static void Kil(EmitterContext context)
{
InstKil op = context.GetOp<InstKil>();
context.Discard();
}
public static void Pbk(EmitterContext context)
{
InstPbk op = context.GetOp<InstPbk>();
EmitPbkOrSsy(context);
}
public static void Ret(EmitterContext context)
{
InstRet op = context.GetOp<InstRet>();
if (context.IsNonMain)
{
context.Return();
}
else
{
context.Config.GpuAccessor.Log("Invalid return on main function.");
}
}
public static void Ssy(EmitterContext context)
{
InstSsy op = context.GetOp<InstSsy>();
EmitPbkOrSsy(context);
}
public static void Sync(EmitterContext context)
{
InstSync op = context.GetOp<InstSync>();
EmitBrkOrSync(context);
}
private static void EmitPbkOrSsy(EmitterContext context)
{
var consumers = context.CurrBlock.PushOpCodes.First(x => x.Op.Address == context.CurrOp.Address).Consumers;
foreach (KeyValuePair<Block, Operand> kv in consumers)
{
Block consumerBlock = kv.Key;
Operand local = kv.Value;
int id = consumerBlock.SyncTargets[context.CurrOp.Address].PushOpId;
context.Copy(local, Const(id));
}
}
private static void EmitBrkOrSync(EmitterContext context)
{
var targets = context.CurrBlock.SyncTargets;
if (targets.Count == 1)
{
// If we have only one target, then the SSY/PBK is basically
// a branch, we can produce better codegen for this case.
EmitBranch(context, targets.Values.First().PushOpInfo.Op.GetAbsoluteAddress());
}
else
{
// TODO: Support CC here aswell (condition).
foreach (SyncTarget target in targets.Values)
{
PushOpInfo pushOpInfo = target.PushOpInfo;
Operand label = context.GetLabel(pushOpInfo.Op.GetAbsoluteAddress());
Operand local = pushOpInfo.Consumers[context.CurrBlock];
context.BranchIfTrue(label, context.ICompareEqual(local, Const(target.PushOpId)));
}
}
}
private static void EmitBranch(EmitterContext context, ulong address)
{
InstOp op = context.CurrOp;
InstConditional opCond = new InstConditional(op.RawOpCode);
// If we're branching to the next instruction, then the branch
// is useless and we can ignore it.
if (address == op.Address + 8)
{
return;
}
Operand label = context.GetLabel(address);
Operand pred = Register(opCond.Pred, RegisterType.Predicate);
if (opCond.Ccc != Ccc.T)
{
Operand cond = GetCondition(context, opCond.Ccc);
if (opCond.Pred == RegisterConsts.PredicateTrueIndex)
{
pred = cond;
}
else if (opCond.PredInv)
{
pred = context.BitwiseAnd(context.BitwiseNot(pred), cond);
}
else
{
pred = context.BitwiseAnd(pred, cond);
}
context.BranchIfTrue(label, pred);
}
else if (opCond.Pred == RegisterConsts.PredicateTrueIndex)
{
context.Branch(label);
}
else if (opCond.PredInv)
{
context.BranchIfFalse(label, pred);
}
else
{
context.BranchIfTrue(label, pred);
}
}
private static Operand GetCondition(EmitterContext context, Ccc cond)
{
// TODO: More condition codes, figure out how they work.
switch (cond)
{
case Ccc.Eq:
case Ccc.Equ:
return GetZF();
case Ccc.Ne:
case Ccc.Neu:
return context.BitwiseNot(GetZF());
}
return Const(IrConsts.True);
}
}
}