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Optimize cmp#0 always has carry set

This commit is contained in:
drmortalwombat 2022-05-30 22:28:36 +02:00
parent a86f5b877a
commit 1b8e1f4048
1 changed files with 78 additions and 0 deletions
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78
oscar64/NativeCodeGenerator.cpp
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@ -1640,6 +1640,12 @@ void NativeCodeInstruction::Simulate(NativeRegisterDataSet& data)
data.mRegs[CPU_REG_Z].Reset();
}
}
else if (mMode == ASMIM_IMMEDIATE && mAddress == 0)
{
data.mRegs[CPU_REG_C].mValue = 1;
data.mRegs[CPU_REG_C].mMode = NRDM_IMMEDIATE;
data.mRegs[CPU_REG_Z].Reset();
}
else
{
data.mRegs[CPU_REG_C].Reset();
@ -1664,6 +1670,12 @@ void NativeCodeInstruction::Simulate(NativeRegisterDataSet& data)
data.mRegs[CPU_REG_Z].Reset();
}
}
else if (mMode == ASMIM_IMMEDIATE && mAddress == 0)
{
data.mRegs[CPU_REG_C].mValue = 1;
data.mRegs[CPU_REG_C].mMode = NRDM_IMMEDIATE;
data.mRegs[CPU_REG_Z].Reset();
}
else
{
data.mRegs[CPU_REG_C].Reset();
@ -1688,6 +1700,12 @@ void NativeCodeInstruction::Simulate(NativeRegisterDataSet& data)
data.mRegs[CPU_REG_Z].Reset();
}
}
else if (mMode == ASMIM_IMMEDIATE && mAddress == 0)
{
data.mRegs[CPU_REG_C].mValue = 1;
data.mRegs[CPU_REG_C].mMode = NRDM_IMMEDIATE;
data.mRegs[CPU_REG_Z].Reset();
}
else
{
data.mRegs[CPU_REG_C].Reset();
@ -11967,6 +11985,36 @@ bool NativeCodeBasicBlock::ExpandADCToBranch(NativeCodeProcedure* proc)
{
if (mBranch == ASMIT_BEQ)
{
if (mIns[sz - 1].mMode == ASMIM_IMMEDIATE && mIns[sz - 1].mAddress == 0)
{
if (mFalseJump->mIns.Size() == 0)
{
if (mFalseJump->mBranch == ASMIT_BCC)
{
mFalseJump = mFalseJump->mFalseJump;
changed = true;
}
else if (mFalseJump->mBranch == ASMIT_BCS)
{
mFalseJump = mFalseJump->mTrueJump;
changed = true;
}
}
if (mTrueJump->mIns.Size() == 0)
{
if (mTrueJump->mBranch == ASMIT_BCC)
{
mTrueJump = mTrueJump->mFalseJump;
changed = true;
}
else if (mTrueJump->mBranch == ASMIT_BCS)
{
mTrueJump = mTrueJump->mTrueJump;
changed = true;
}
}
}
if (mFalseJump->mNumEntries == 1 && mTrueJump->mNumEntries == 2 && mFalseJump->mIns.Size() == 0)
{
if (mFalseJump->mBranch == ASMIT_BCC)
@ -11991,6 +12039,36 @@ bool NativeCodeBasicBlock::ExpandADCToBranch(NativeCodeProcedure* proc)
}
else if (mBranch == ASMIT_BNE)
{
if (mIns[sz - 1].mMode == ASMIM_IMMEDIATE && mIns[sz - 1].mAddress == 0)
{
if (mFalseJump->mIns.Size() == 0)
{
if (mFalseJump->mBranch == ASMIT_BCC)
{
mFalseJump = mFalseJump->mFalseJump;
changed = true;
}
else if (mFalseJump->mBranch == ASMIT_BCS)
{
mFalseJump = mFalseJump->mTrueJump;
changed = true;
}
}
if (mTrueJump->mIns.Size() == 0)
{
if (mTrueJump->mBranch == ASMIT_BCC)
{
mTrueJump = mTrueJump->mFalseJump;
changed = true;
}
else if (mTrueJump->mBranch == ASMIT_BCS)
{
mTrueJump = mTrueJump->mTrueJump;
changed = true;
}
}
}
if (mTrueJump->mNumEntries == 1 && mFalseJump->mNumEntries == 2 && mTrueJump->mIns.Size() == 0)
{
if (mTrueJump->mBranch == ASMIT_BCC)