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Optimize signed divide by two

This commit is contained in:
drmortalwombat 2023-01-08 19:17:25 +01:00
parent 50d3c843b4
commit b04f05b575
5 changed files with 184 additions and 39 deletions
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3
autotest/autotest.bat
View File

@ -15,6 +15,9 @@ rem @echo off
@call :test testsigned16mul.c
@if %errorlevel% neq 0 goto :error
@call :test testsigned16div.c
@if %errorlevel% neq 0 goto :error
@call :test recursiontest.c
@if %errorlevel% neq 0 goto :error

29
autotest/testsigned16div.c Normal file
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@ -0,0 +1,29 @@
#include <assert.h>
int multab[32];
void fill_mulli(int m)
{
#pragma unroll(full)
for(int i=-16; i<16; i++)
if (i != 0)
multab[i + 16] = m / i;
}
void check_mulli(int m)
{
for(int i=-16; i<16; i++)
if (i != 0)
assert(multab[i + 16] == m / i);
}
int main(void)
{
for(int i=-1024; i<=1024; i++)
{
fill_mulli(i);
check_mulli(i);
}
return 0;
}

4
autotest/testsigned16mul.c
View File

@ -2,14 +2,14 @@
int multab[32];
inline void fill_mulli(int m)
void fill_mulli(int m)
{
#pragma unroll(full)
for(int i=-16; i<16; i++)
multab[i + 16] = m * i;
}
inline void check_mulli(int m)
void check_mulli(int m)
{
for(int i=-16; i<16; i++)
assert(multab[i + 16] == m * i);

186
oscar64/NativeCodeGenerator.cpp
View File

@ -7020,6 +7020,32 @@ void NativeCodeBasicBlock::ShiftRegisterLeftByte(InterCodeProcedure* proc, int r
}
}
int NativeCodeBasicBlock::ShortSignedDivide(InterCodeProcedure* proc, NativeCodeProcedure* nproc, const InterInstruction* ins, const InterInstruction* sins, int mul)
{
int dreg = BC_REG_TMP + proc->mTempOffset[ins->mDst.mTemp];
int sreg = BC_REG_TMP + proc->mTempOffset[ins->mSrc[1].mTemp];
if (sins)
{
LoadValueToReg(proc, sins, dreg, nullptr, nullptr);
sreg = dreg;
}
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ASL));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_IMMEDIATE, 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_IMMEDIATE, 0));
mIns.Push(NativeCodeInstruction(ASMIT_CMP, ASMIM_IMMEDIATE, 0x80));
mIns.Push(NativeCodeInstruction(ASMIT_ROR));
mIns.Push(NativeCodeInstruction(ASMIT_ROR, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
return dreg;
}
int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProcedure* nproc, const InterInstruction * ins, const InterInstruction* sins, int index, int mul)
{
mul &= 0xffff;
@ -7069,6 +7095,10 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
sreg = dreg;
}
int wreg = BC_REG_ACCU;
if (sreg != dreg)
wreg = dreg;
switch (mul)
{
case 0xffff: // -1
@ -7094,19 +7124,19 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
case 0xfffd: // -3
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_ROL));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_SEC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, sreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
break;
case 0xfffc: // -4
@ -7201,6 +7231,10 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
}
int wreg = BC_REG_ACCU;
if (dreg == BC_REG_ACCU)
wreg = BC_REG_WORK + 4;
switch (lmul)
{
#if 1
@ -7228,15 +7262,15 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_CLC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
}
@ -7262,17 +7296,17 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_CLC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
}
@ -7286,21 +7320,46 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
ShiftRegisterLeft(proc, dreg, lshift);
return dreg;
case 7:
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
if (ins->mSrc[index].IsUByte() && ins->mSrc[index].mRange.mMaxValue < 64)
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
}
else if (ins->mSrc[index].IsUByte() && ins->mSrc[index].mRange.mMaxValue < 128)
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
}
else
{
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
}
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_SEC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_SBC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
if (ins->mDst.IsUByte())
@ -7315,19 +7374,19 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
case 9:
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_CLC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 4));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 5));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
if (ins->mDst.IsUByte())
@ -7353,18 +7412,18 @@ int NativeCodeBasicBlock::ShortMultiply(InterCodeProcedure* proc, NativeCodeProc
mIns.Push(NativeCodeInstruction(ASMIT_TAX, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_TYA, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, BC_REG_WORK + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_TXA, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, BC_REG_WORK + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, BC_REG_WORK + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ASL, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, BC_REG_WORK + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ROL, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_CLC, ASMIM_IMPLIED));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, BC_REG_WORK + 0));
mIns.Push(NativeCodeInstruction(ASMIT_LDA, ASMIM_ZERO_PAGE, wreg + 0));
mIns.Push(NativeCodeInstruction(ASMIT_ADC, ASMIM_ZERO_PAGE, dreg + 1));
mIns.Push(NativeCodeInstruction(ASMIT_STA, ASMIM_ZERO_PAGE, dreg + 1));
ShiftRegisterLeft(proc, dreg, lshift);
@ -8790,6 +8849,10 @@ NativeCodeBasicBlock* NativeCodeBasicBlock::BinaryOperator(InterCodeProcedure* p
mIns.Push(NativeCodeInstruction(ASMIT_JSR, ASMIM_ABSOLUTE, frt.mOffset, frt.mLinkerObject, NCIF_RUNTIME | NCIF_LOWER | NCIF_UPPER | NCIF_USE_CPU_REG_A));
reg = BC_REG_WORK + 2;
}
else if (ins->mOperator == IA_DIVS && ins->mSrc[0].mTemp < 0 && ins->mSrc[0].mIntConst == 2)
{
reg = ShortSignedDivide(proc, nproc, ins, sins1, ins->mSrc[0].mIntConst);
}
else
{
if (sins1)
@ -16514,6 +16577,42 @@ bool NativeCodeBasicBlock::JoinTailCodeSequences(NativeCodeProcedure* proc, bool
}
#endif
if (mEntryBlocks.Size() == 1 && mIns.Size() >= 3)
{
NativeCodeBasicBlock* eblock = mEntryBlocks[0];
int es = eblock->mIns.Size();
while (es > 0 && !eblock->mIns[es - 1].ChangesAccu())
es--;
if (es > 0 && eblock->mIns[es - 1].mType == ASMIT_LDA && (eblock->mIns[es - 1].mMode == ASMIM_ZERO_PAGE || eblock->mIns[es - 1].mMode == ASMIM_ABSOLUTE))
{
int i = es;
es--;
while (i < eblock->mIns.Size() && !eblock->mIns[es].MayBeChangedOnAddress(eblock->mIns[i]))
i++;
if (i == eblock->mIns.Size())
{
if (mIns[2].mType == ASMIT_STA && mIns[2].SameEffectiveAddress(eblock->mIns[es]) && !(mIns[2].mLive & (LIVE_CPU_REG_A | LIVE_CPU_REG_C)))
{
if (mIns[0].mType == ASMIT_SEC && mIns[1].mType == ASMIT_SBC && mIns[1].mMode == ASMIM_IMMEDIATE && mIns[1].mAddress == 1)
{
mIns[0].mType = ASMIT_NOP;
mIns[1].mType = ASMIT_NOP; mIns[1].mMode = ASMIM_IMPLIED;
mIns[2].mType = ASMIT_DEC;
changed = true;
}
else if (mIns[0].mType == ASMIT_CLC && mIns[1].mType == ASMIT_ADC && mIns[1].mMode == ASMIM_IMMEDIATE && mIns[1].mAddress == 1)
{
mIns[0].mType = ASMIT_NOP;
mIns[1].mType = ASMIT_NOP; mIns[1].mMode = ASMIM_IMPLIED;
mIns[2].mType = ASMIT_INC;
changed = true;
}
}
}
}
}
CheckLive();
if (mTrueJump && mTrueJump->JoinTailCodeSequences(proc, loops))
@ -24949,6 +25048,19 @@ void NativeCodeBasicBlock::BlockSizeReduction(NativeCodeProcedure* proc, int xen
j += 3;
i += 4;
}
#if 1
else if (i + 3 < mIns.Size() &&
mIns[i + 0].mType == ASMIT_CLC &&
mIns[i + 1].mType == ASMIT_ADC && mIns[i + 1].mMode == ASMIM_IMMEDIATE && mIns[i + 1].mAddress == 0x01 &&
mIns[i + 2].mType == ASMIT_CLC &&
mIns[i + 3].mType == ASMIT_ADC)
{
mIns[j + 0] = NativeCodeInstruction(ASMIT_SEC);
mIns[j + 1] = mIns[i + 3];
j += 2;
i += 4;
}
#endif
else if (i + 1 < mIns.Size() &&
mIns[i + 0].ChangesZFlag() && mIns[i + 1].mType == ASMIT_LDA && mIns[i + 0].SameEffectiveAddress(mIns[i + 1]) && !(mIns[i + 1].mLive & LIVE_CPU_REG_A))
{

1
oscar64/NativeCodeGenerator.h
View File

@ -263,6 +263,7 @@ public:
void ShiftRegisterLeftByte(InterCodeProcedure* proc, int reg, int shift);
void ShiftRegisterLeftFromByte(InterCodeProcedure* proc, int reg, int shift, int max);
int ShortMultiply(InterCodeProcedure* proc, NativeCodeProcedure* nproc, const InterInstruction * ins, const InterInstruction* sins, int index, int mul);
int ShortSignedDivide(InterCodeProcedure* proc, NativeCodeProcedure* nproc, const InterInstruction* ins, const InterInstruction* sins, int mul);
bool CheckPredAccuStore(int reg);