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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
#include "IntBranchDelayTest.h"
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#include "VuAssembler.h"
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void CIntBranchDelayTest::Execute(CTestVm& virtualMachine)
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{
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virtualMachine.Reset();
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auto microMem = reinterpret_cast<uint32*>(virtualMachine.m_microMem);
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//Inspired by Dawn of Mana (FMAC delay right at the moment branch is to be executed)
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{
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CVuAssembler assembler(microMem);
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auto equalLabel = assembler.CreateLabel();
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auto doneLabel = assembler.CreateLabel();
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//pipeTime = 0 (LQ result available at pipeTime 4)
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::LQ(CVuAssembler::DEST_XYZ, CVuAssembler::VF2, 0, CVuAssembler::VI5));
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//pipeTime = 1
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::LQ(CVuAssembler::DEST_XYZ, CVuAssembler::VF3, 1, CVuAssembler::VI5));
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//pipeTime = 2
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::ISUBIU(CVuAssembler::VI1, CVuAssembler::VI1, 1));
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//pipeTime = 3, 4
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//Upper instruction stalls here waiting for result from pipeTime 0
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//This gives enough time for the IBEQ instruction to pick up the result
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//from the previous ISUBIU instruction
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assembler.Write(
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CVuAssembler::Upper::ITOF12(CVuAssembler::DEST_XYZ, CVuAssembler::VF2, CVuAssembler::VF2),
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CVuAssembler::Lower::IBEQ(CVuAssembler::VI1, CVuAssembler::VI0, equalLabel));
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assembler.Write(
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CVuAssembler::Upper::ITOF12(CVuAssembler::DEST_XYZ, CVuAssembler::VF3, CVuAssembler::VF3),
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CVuAssembler::Lower::NOP());
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::IADDIU(CVuAssembler::VI2, CVuAssembler::VI0, 0));
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::IBEQ(CVuAssembler::VI0, CVuAssembler::VI0, doneLabel));
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::NOP());
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assembler.MarkLabel(equalLabel);
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::IADDIU(CVuAssembler::VI2, CVuAssembler::VI0, 1));
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assembler.MarkLabel(doneLabel);
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assembler.Write(
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CVuAssembler::Upper::NOP() | CVuAssembler::Upper::E_BIT,
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CVuAssembler::Lower::NOP());
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assembler.Write(
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CVuAssembler::Upper::NOP(),
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CVuAssembler::Lower::NOP());
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}
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virtualMachine.m_cpu.m_State.nCOP2VI[1] = 1;
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virtualMachine.ExecuteTest(0);
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TEST_VERIFY(virtualMachine.m_cpu.m_State.nCOP2VI[1] == 0);
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TEST_VERIFY(virtualMachine.m_cpu.m_State.nCOP2VI[2] == 1);
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}
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