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JitArm64: Implement dcbt #2845

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Aug 14, 2015
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JitArm64: Implement dcbt #2845

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1 change: 1 addition & 0 deletions Source/Core/Core/PowerPC/JitArm64/Jit.h
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,7 @@ class JitArm64 : public JitBase, public Arm64Gen::ARM64CodeBlock
void stX(UGeckoInstruction inst);
void lmw(UGeckoInstruction inst);
void stmw(UGeckoInstruction inst);
void dcbt(UGeckoInstruction inst);

// LoadStore floating point
void lfXX(UGeckoInstruction inst);
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20 changes: 20 additions & 0 deletions Source/Core/Core/PowerPC/JitArm64/JitArm64_LoadStore.cpp
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Expand Up @@ -623,3 +623,23 @@ void JitArm64::stmw(UGeckoInstruction inst)

gpr.Unlock(WA, WB);
}

void JitArm64::dcbt(UGeckoInstruction inst)
{
INSTRUCTION_START
JITDISABLE(bJITLoadStoreOff);

// Prefetch. Since we don't emulate the data cache, we don't need to do anything.

// If a dcbst follows a dcbt, it probably isn't a case of dynamic code
// modification, so don't bother invalidating the jit block cache.
// This is important because invalidating the block cache when we don't
// need to is terrible for performance.
// (Invalidating the jit block cache on dcbst is a heuristic.)
if (MergeAllowedNextInstructions(1) &&
js.op[1].inst.OPCD == 31 && js.op[1].inst.SUBOP10 == 54 &&
js.op[1].inst.RA == inst.RA && js.op[1].inst.RB == inst.RB)
{
js.skipInstructions = 1;
}
}
4 changes: 2 additions & 2 deletions Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp
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Expand Up @@ -222,8 +222,8 @@ static GekkoOPTemplate table31[] =

{54, &JitArm64::FallBackToInterpreter}, // dcbst
{86, &JitArm64::FallBackToInterpreter}, // dcbf
{246, &JitArm64::DoNothing}, // dcbtst
{278, &JitArm64::DoNothing}, // dcbt
{246, &JitArm64::dcbt}, // dcbtst
{278, &JitArm64::dcbt}, // dcbt
{470, &JitArm64::FallBackToInterpreter}, // dcbi
{758, &JitArm64::DoNothing}, // dcba
{1014, &JitArm64::FallBackToInterpreter}, // dcbz
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