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LightningJit: Reduce stack usage for Arm32 code (#6245)

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* Write/read guest state to context for sync points, stop reserving stack for them

* Fix UsedGprsMask not being updated when allocating with preferencing

* POP should be also considered a return
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gdkchan 2024-02-08 16:17:47 -03:00 • committed by GitHub
parent a0b3d82ee0
commit ea07328aea
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7 changed files with 86 additions and 36 deletions
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66
src/Ryujinx.Cpu/LightningJit/Arm32/Target/Arm64/InstEmitSystem.cs
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@ -354,11 +354,18 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
// All instructions that might do a host call should be included here.
// That is required to reserve space on the stack for caller saved registers.
return name == InstName.Mrrc;
}
public static bool NeedsCallSkipContext(InstName name)
{
// All instructions that might do a host call should be included here.
// That is required to reserve space on the stack for caller saved registers.
switch (name)
{
case InstName.Mcr:
case InstName.Mrc:
case InstName.Mrrc:
case InstName.Svc:
case InstName.Udf:
return true;
@ -372,7 +379,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
Assembler asm = new(writer);
WriteCall(ref asm, regAlloc, GetBkptHandlerPtr(), skipContext: true, spillBaseOffset, null, pc, imm);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, skipContext: true, spillBaseOffset);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, spillBaseOffset);
}
public static void WriteSvc(CodeWriter writer, RegisterAllocator regAlloc, TailMerger tailMerger, int spillBaseOffset, uint pc, uint svcId)
@ -380,7 +387,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
Assembler asm = new(writer);
WriteCall(ref asm, regAlloc, GetSvcHandlerPtr(), skipContext: true, spillBaseOffset, null, pc, svcId);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, skipContext: true, spillBaseOffset);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, spillBaseOffset);
}
public static void WriteUdf(CodeWriter writer, RegisterAllocator regAlloc, TailMerger tailMerger, int spillBaseOffset, uint pc, uint imm)
@ -388,7 +395,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
Assembler asm = new(writer);
WriteCall(ref asm, regAlloc, GetUdfHandlerPtr(), skipContext: true, spillBaseOffset, null, pc, imm);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, skipContext: true, spillBaseOffset);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, spillBaseOffset);
}
public static void WriteReadCntpct(CodeWriter writer, RegisterAllocator regAlloc, int spillBaseOffset, int rt, int rt2)
@ -422,14 +429,14 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
WriteFill(ref asm, regAlloc, resultMask, skipContext: false, spillBaseOffset, tempRegister);
}
public static void WriteSyncPoint(CodeWriter writer, RegisterAllocator regAlloc, TailMerger tailMerger, int spillBaseOffset)
{
Assembler asm = new(writer);
WriteSyncPoint(writer, ref asm, regAlloc, tailMerger, skipContext: false, spillBaseOffset);
}
private static void WriteSyncPoint(CodeWriter writer, ref Assembler asm, RegisterAllocator regAlloc, TailMerger tailMerger, bool skipContext, int spillBaseOffset)
public static void WriteSyncPoint(
CodeWriter writer,
ref Assembler asm,
RegisterAllocator regAlloc,
TailMerger tailMerger,
int spillBaseOffset,
Action storeToContext = null,
Action loadFromContext = null)
{
int tempRegister = regAlloc.AllocateTempGprRegister();
@ -440,7 +447,8 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
int branchIndex = writer.InstructionPointer;
asm.Cbnz(rt, 0);
WriteSpill(ref asm, regAlloc, 1u << tempRegister, skipContext, spillBaseOffset, tempRegister);
storeToContext?.Invoke();
WriteSpill(ref asm, regAlloc, 1u << tempRegister, skipContext: true, spillBaseOffset, tempRegister);
Operand rn = Register(tempRegister == 0 ? 1 : 0);
@ -449,7 +457,8 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
tailMerger.AddConditionalZeroReturn(writer, asm, Register(0, OperandType.I32));
WriteFill(ref asm, regAlloc, 1u << tempRegister, skipContext, spillBaseOffset, tempRegister);
WriteFill(ref asm, regAlloc, 1u << tempRegister, skipContext: true, spillBaseOffset, tempRegister);
loadFromContext?.Invoke();
asm.LdrRiUn(rt, Register(regAlloc.FixedContextRegister), NativeContextOffsets.CounterOffset);
@ -514,18 +523,31 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
private static void WriteSpill(ref Assembler asm, RegisterAllocator regAlloc, uint exceptMask, bool skipContext, int spillOffset, int tempRegister)
{
WriteSpillOrFill(ref asm, regAlloc, skipContext, exceptMask, spillOffset, tempRegister, spill: true);
if (skipContext)
{
InstEmitFlow.WriteSpillSkipContext(ref asm, regAlloc, spillOffset);
}
else
{
WriteSpillOrFill(ref asm, regAlloc, exceptMask, spillOffset, tempRegister, spill: true);
}
}
private static void WriteFill(ref Assembler asm, RegisterAllocator regAlloc, uint exceptMask, bool skipContext, int spillOffset, int tempRegister)
{
WriteSpillOrFill(ref asm, regAlloc, skipContext, exceptMask, spillOffset, tempRegister, spill: false);
if (skipContext)
{
InstEmitFlow.WriteFillSkipContext(ref asm, regAlloc, spillOffset);
}
else
{
WriteSpillOrFill(ref asm, regAlloc, exceptMask, spillOffset, tempRegister, spill: false);
}
}
private static void WriteSpillOrFill(
ref Assembler asm,
RegisterAllocator regAlloc,
bool skipContext,
uint exceptMask,
int spillOffset,
int tempRegister,
@ -533,11 +555,6 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
{
uint gprMask = regAlloc.UsedGprsMask & ~(AbiConstants.GprCalleeSavedRegsMask | exceptMask);
if (skipContext)
{
gprMask &= ~Compiler.UsableGprsMask;
}
if (!spill)
{
// We must reload the status register before reloading the GPRs,
@ -600,11 +617,6 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
uint fpSimdMask = regAlloc.UsedFpSimdMask;
if (skipContext)
{
fpSimdMask &= ~Compiler.UsableFpSimdMask;
}
while (fpSimdMask != 0)
{
int reg = BitOperations.TrailingZeroCount(fpSimdMask);