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fix(instr): fix timing issues with select instructions 

instr_timing now runs (and fails on everything)
This commit is contained in:
Rekai Nyangadzayi Musuka 2021-10-30 14:02:28 +09:00
parent b9519d9b7a
commit 4125ea5c74
1 changed files with 11 additions and 8 deletions
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19
src/instruction.rs
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@ -334,7 +334,6 @@ impl Instruction {
Instruction::ADD(target, src) => match (target, src) {
(AddTarget::HL, AddSource::Group1(pair)) => {
// ADD HL, r16 | Add 16-bit register to HL
// FIXME: Memory Timings are not properly emulated for this instruction
use Group1RegisterPair::*;
let mut flags: Flags = *cpu.flags();
@ -342,10 +341,11 @@ impl Instruction {
BC | DE | HL | SP => {
let left = cpu.register_pair(RegisterPair::HL);
let right = cpu.register_pair(pair.as_register_pair());
cpu.set_register_pair(
RegisterPair::HL,
Self::add_u16(left, right, &mut flags),
);
let result = Self::add_u16(left, right, &mut flags);
cpu.set_register(CpuRegister::L, result as u8);
cpu.bus.clock();
cpu.set_register(CpuRegister::H, (result >> 8) as u8);
}
}
cpu.set_flags(flags);
@ -376,12 +376,15 @@ impl Instruction {
}
(AddTarget::SP, AddSource::ImmediateSignedByte) => {
// ADD SP, i8 | Add i8 to stack pointer
// FIXME: Memory Timings are not properly emulated for this instruction
let mut flags: Flags = *cpu.flags();
let left = cpu.register_pair(RegisterPair::SP);
let sum = Self::add_u16_i8(left, Self::imm_byte(cpu) as i8, &mut flags);
cpu.bus.clock(); // internal
cpu.set_register_pair(RegisterPair::SP, sum);
cpu.bus.clock();
cpu.set_flags(flags);
16
}
@ -423,7 +426,6 @@ impl Instruction {
AllRegisters::Group1(pair) => {
// INC r16 | Increment 16-bit register
// Note: No flags are set with this version of the INC instruction
// FIXME: Memory Timings are not properly emulated for this instruction
use Group1RegisterPair::*;
match pair {
@ -431,6 +433,7 @@ impl Instruction {
let pair = pair.as_register_pair();
let left = cpu.register_pair(pair);
cpu.set_register_pair(pair, left.wrapping_add(1));
cpu.bus.clock(); // internal
}
}
8
@ -462,7 +465,6 @@ impl Instruction {
}
AllRegisters::Group1(pair) => {
// DEC r16 | Decrement Register Pair
// FIXME: Memory Timings are not properly emulated for this instruction
use Group1RegisterPair::*;
match pair {
@ -470,6 +472,7 @@ impl Instruction {
let pair = pair.as_register_pair();
let left = cpu.register_pair(pair);
cpu.set_register_pair(pair, left.wrapping_sub(1));
cpu.bus.clock(); // internal
}
};
8