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OpcodeDispatcher: use ForeachDirection for scas

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
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Alyssa Rosenzweig committed 2024-03-31 20:31:38 -04:00
1 parent 5c7f2934de
commit 7b1bb159fa
1 file changed
+47 -48
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FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+47 -48
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@@ -3819,71 +3819,70 @@ void OpDispatchBuilder::SCASOp(OpcodeArgs) {
// Calculate flags early. because end of block
CalculateDeferredFlags();
bool REPE = Op->Flags & FEXCore::X86Tables::DecodeFlags::FLAG_REP_PREFIX;
ForeachDirection([this, Op, Size](int Dir){
bool REPE = Op->Flags & FEXCore::X86Tables::DecodeFlags::FLAG_REP_PREFIX;
// read DF once
auto PtrDir = LoadDir(Size);
auto JumpStart = Jump();
// Make sure to start a new block after ending this one
auto LoopStart = CreateNewCodeBlockAfter(GetCurrentBlock());
SetJumpTarget(JumpStart, LoopStart);
SetCurrentCodeBlock(LoopStart);
StartNewBlock();
auto JumpStart = Jump();
// Make sure to start a new block after ending this one
auto LoopStart = CreateNewCodeBlockAfter(GetCurrentBlock());
SetJumpTarget(JumpStart, LoopStart);
SetCurrentCodeBlock(LoopStart);
StartNewBlock();
OrderedNode *Counter = LoadGPRRegister(X86State::REG_RCX);
OrderedNode *Counter = LoadGPRRegister(X86State::REG_RCX);
// Can we end the block?
// We leave if RCX = 0
auto CondJump_ = CondJump(Counter, {COND_EQ});
IRPair<IROp_CondJump> InternalCondJump;
// Can we end the block?
// We leave if RCX = 0
auto CondJump_ = CondJump(Counter, {COND_EQ});
IRPair<IROp_CondJump> InternalCondJump;
auto LoopTail = CreateNewCodeBlockAfter(LoopStart);
SetFalseJumpTarget(CondJump_, LoopTail);
SetCurrentCodeBlock(LoopTail);
StartNewBlock();
auto LoopTail = CreateNewCodeBlockAfter(LoopStart);
SetFalseJumpTarget(CondJump_, LoopTail);
SetCurrentCodeBlock(LoopTail);
StartNewBlock();
// Working loop
{
OrderedNode *Dest_RDI = LoadGPRRegister(X86State::REG_RDI);
// Working loop
{
OrderedNode *Dest_RDI = LoadGPRRegister(X86State::REG_RDI);
Dest_RDI = AppendSegmentOffset(Dest_RDI, 0, FEXCore::X86Tables::DecodeFlags::FLAG_ES_PREFIX, true);
Dest_RDI = AppendSegmentOffset(Dest_RDI, 0, FEXCore::X86Tables::DecodeFlags::FLAG_ES_PREFIX, true);
auto Src1 = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});
auto Src2 = _LoadMemAutoTSO(GPRClass, Size, Dest_RDI, Size);
auto Src1 = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});
auto Src2 = _LoadMemAutoTSO(GPRClass, Size, Dest_RDI, Size);
GenerateFlags_SUB(Op, Src1, Src2);
GenerateFlags_SUB(Op, Src1, Src2);
// Calculate flags early.
CalculateDeferredFlags();
// Calculate flags early.
CalculateDeferredFlags();
OrderedNode *TailCounter = LoadGPRRegister(X86State::REG_RCX);
OrderedNode *TailDest_RDI = LoadGPRRegister(X86State::REG_RDI);
OrderedNode *TailCounter = LoadGPRRegister(X86State::REG_RCX);
OrderedNode *TailDest_RDI = LoadGPRRegister(X86State::REG_RDI);
// Decrement counter
TailCounter = _Sub(OpSize::i64Bit, TailCounter, _Constant(1));
// Decrement counter
TailCounter = _Sub(OpSize::i64Bit, TailCounter, _Constant(1));
// Store the counter since we don't have phis
StoreGPRRegister(X86State::REG_RCX, TailCounter);
// Store the counter since we don't have phis
StoreGPRRegister(X86State::REG_RCX, TailCounter);
// Offset the pointer
TailDest_RDI = _Add(OpSize::i64Bit, TailDest_RDI, _Constant(Dir * Size));
StoreGPRRegister(X86State::REG_RDI, TailDest_RDI);
// Offset the pointer
TailDest_RDI = _Add(OpSize::i64Bit, TailDest_RDI, PtrDir);
StoreGPRRegister(X86State::REG_RDI, TailDest_RDI);
CalculateDeferredFlags();
InternalCondJump = CondJumpNZCV({REPE ? COND_EQ : COND_NEQ});
CalculateDeferredFlags();
InternalCondJump = CondJumpNZCV({REPE ? COND_EQ : COND_NEQ});
// Jump back to the start if we have more work to do
SetTrueJumpTarget(InternalCondJump, LoopStart);
}
// Make sure to start a new block after ending this one
auto LoopEnd = CreateNewCodeBlockAfter(LoopTail);
SetTrueJumpTarget(CondJump_, LoopEnd);
// Jump back to the start if we have more work to do
SetTrueJumpTarget(InternalCondJump, LoopStart);
}
// Make sure to start a new block after ending this one
auto LoopEnd = CreateNewCodeBlockAfter(LoopTail);
SetTrueJumpTarget(CondJump_, LoopEnd);
SetFalseJumpTarget(InternalCondJump, LoopEnd);
SetFalseJumpTarget(InternalCondJump, LoopEnd);
SetCurrentCodeBlock(LoopEnd);
StartNewBlock();
SetCurrentCodeBlock(LoopEnd);
StartNewBlock();
});
}
}