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Combined I and R into a register pair.

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This commit is contained in:
Thomas Harte 2017-06-17 18:18:28 -04:00
parent 50cd617bd9
commit efc7f9df37
1 changed files with 15 additions and 14 deletions
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29
Processors/Z80/Z80.hpp
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@ -87,10 +87,11 @@ struct MachineCycle {
*/
template <class T> class Processor {
private:
uint8_t a_, i_, r_;
uint8_t a_;
RegisterPair bc_, de_, hl_;
RegisterPair afDash_, bcDash_, deDash_, hlDash_;
RegisterPair ix_, iy_, pc_, sp_;
RegisterPair ir_;
bool iff1_, iff2_;
int interrupt_mode_;
uint16_t pc_increment_;
@ -392,19 +393,19 @@ template <class T> class Processor {
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(bc_.bytes.high),
/* 0x42 SBC HL, BC */ SBC16(hl_, bc_), /* 0x43 LD (nn), BC */ Program(FETCH16(temp16_, pc_), STORE16L(bc_, temp16_)),
/* 0x44 NEG */ Program({MicroOp::NEG}), /* 0x45 RETN */ Program(POP(pc_), {MicroOp::RETN}),
/* 0x46 IM 0 */ Program({MicroOp::IM}), /* 0x47 LD I, A */ Program(WAIT(1), {MicroOp::Move8, &a_, &i_}),
/* 0x46 IM 0 */ Program({MicroOp::IM}), /* 0x47 LD I, A */ Program(WAIT(1), {MicroOp::Move8, &a_, &ir_.bytes.high}),
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(bc_.bytes.low),
/* 0x4a ADC HL, BC */ ADC16(hl_, bc_), /* 0x4b LD BC, (nn) */ Program(FETCH16(temp16_, pc_), FETCH16L(bc_, temp16_)),
/* 0x4c NEG */ Program({MicroOp::NEG}), /* 0x4d RETI */ Program(POP(pc_), {MicroOp::RETN}),
/* 0x4e IM 0/1 */ Program({MicroOp::IM}), /* 0x4f LD R, A */ Program(WAIT(1), {MicroOp::Move8, &a_, &r_}),
/* 0x4e IM 0/1 */ Program({MicroOp::IM}), /* 0x4f LD R, A */ Program(WAIT(1), {MicroOp::Move8, &a_, &ir_.bytes.low}),
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(de_.bytes.high),
/* 0x52 SBC HL, DE */ SBC16(hl_, de_), /* 0x53 LD (nn), DE */ Program(FETCH16(temp16_, pc_), STORE16L(de_, temp16_)),
/* 0x54 NEG */ Program({MicroOp::NEG}), /* 0x55 RETN */ Program(POP(pc_), {MicroOp::RETN}),
/* 0x56 IM 1 */ Program({MicroOp::IM}), /* 0x57 LD A, I */ Program(WAIT(1), {MicroOp::Move8, &i_, &a_}, {MicroOp::SetAFlags}),
/* 0x56 IM 1 */ Program({MicroOp::IM}), /* 0x57 LD A, I */ Program(WAIT(1), {MicroOp::Move8, &ir_.bytes.high, &a_}, {MicroOp::SetAFlags}),
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(de_.bytes.low),
/* 0x5a ADC HL, DE */ ADC16(hl_, de_), /* 0x5b LD DE, (nn) */ Program(FETCH16(temp16_, pc_), FETCH16L(de_, temp16_)),
/* 0x5c NEG */ Program({MicroOp::NEG}), /* 0x5d RETN */ Program(POP(pc_), {MicroOp::RETN}),
/* 0x5e IM 2 */ Program({MicroOp::IM}), /* 0x5f LD A, R */ Program(WAIT(1), {MicroOp::Move8, &r_, &a_}, {MicroOp::SetAFlags}),
/* 0x5e IM 2 */ Program({MicroOp::IM}), /* 0x5f LD A, R */ Program(WAIT(1), {MicroOp::Move8, &ir_.bytes.low, &a_}, {MicroOp::SetAFlags}),
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(hl_.bytes.high),
/* 0x62 SBC HL, HL */ SBC16(hl_, hl_), /* 0x63 LD (nn), HL */ Program(FETCH16(temp16_, pc_), STORE16L(hl_, temp16_)),
/* 0x64 NEG */ Program({MicroOp::NEG}), /* 0x65 RETN */ Program(POP(pc_), {MicroOp::RETN}),
@ -731,7 +732,7 @@ template <class T> class Processor {
{ MicroOp::BeginIRQ },
{ MicroOp::BusOperation, nullptr, nullptr, {BusOperation::Interrupt, 7, nullptr, &temp16_.bytes.low}},
PUSH(pc_),
{ MicroOp::Move8, &i_, &temp16_.bytes.high },
{ MicroOp::Move8, &ir_.bytes.high, &temp16_.bytes.high },
FETCH16L(pc_, temp16_),
{ MicroOp::MoveToNextProgram }
};
@ -813,7 +814,7 @@ template <class T> class Processor {
advance_operation();
break;
case MicroOp::DecodeOperation:
r_ = (r_ & 0x80) | ((r_ + current_instruction_page_->r_step) & 0x7f);
ir_.bytes.low = (ir_.bytes.low & 0x80) | ((ir_.bytes.low + current_instruction_page_->r_step) & 0x7f);
pc_.full += pc_increment_ & (uint16_t)halt_mask_;
case MicroOp::DecodeOperationNoRChange:
scheduled_program_counter_ = current_instruction_page_->instructions[operation_ & halt_mask_];
@ -1544,7 +1545,7 @@ template <class T> class Processor {
sp_.full = 0xffff;
a_ = 0xff;
set_flags(0xff);
i_ = r_ = 0;
ir_.full = 0;
break;
#pragma mark - Internal bookkeeping
@ -1661,9 +1662,9 @@ template <class T> class Processor {
case Register::IYl: return iy_.bytes.low;
case Register::IY: return iy_.full;
case Register::R: return r_;
case Register::I: return i_;
case Register::Refresh: return (uint16_t)(r_ | (i_ << 8));
case Register::R: return ir_.bytes.low;
case Register::I: return ir_.bytes.high;
case Register::Refresh: return ir_.full;
case Register::IFF1: return iff1_ ? 1 : 0;
case Register::IFF2: return iff2_ ? 1 : 0;
@ -1720,9 +1721,9 @@ template <class T> class Processor {
case Register::IYl: iy_.bytes.low = (uint8_t)value; break;
case Register::IY: iy_.full = value; break;
case Register::R: r_ = (uint8_t)value; break;
case Register::I: i_ = (uint8_t)value; break;
case Register::Refresh: r_ = (uint8_t)value; i_ = (uint8_t)(value >> 8); break;
case Register::R: ir_.bytes.low = (uint8_t)value; break;
case Register::I: ir_.bytes.high = (uint8_t)value; break;
case Register::Refresh: ir_.full = (uint16_t)value; break;
case Register::IFF1: iff1_ = !!value; break;
case Register::IFF2: iff2_ = !!value; break;