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Add cpu idling and int checks to instructions, refactor branching

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scawful
2024-04-22 19:09:00 -04:00
parent 365811739a
commit f301976316
6 changed files with 338 additions and 141 deletions
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19
src/app/emu/cpu/cpu.h
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@@ -250,6 +250,16 @@ class Cpu : public Loggable, public core::ExperimentFlags {
return (high << 16) | low;
}
void DoBranch(bool check) {
if (!check) CheckInt();
uint8_t value = FetchByte();
if (check) {
CheckInt();
callbacks_.idle(false); // taken branch: 1 extra cycle
next_pc_ += (int8_t)value;
}
}
// ==========================================================================
// Addressing Modes
@@ -519,13 +529,13 @@ class Cpu : public Loggable, public core::ExperimentFlags {
void JMP(uint16_t address);
// JML: Jump long
void JML(uint32_t address);
void JML(uint16_t address);
// JSR: Jump to subroutine
void JSR(uint16_t address);
// JSL: Jump to subroutine long
void JSL(uint32_t address);
void JSL(uint16_t address);
// LDA: Load accumulator
void LDA(uint16_t address, bool immediate = false, bool direct_page = false,
@@ -541,10 +551,10 @@ class Cpu : public Loggable, public core::ExperimentFlags {
void LSR(uint16_t address, bool accumulator = false);
// MVN: Block move next
void MVN(uint16_t source, uint16_t dest, uint16_t length);
void MVN();
// MVP: Block move previous
void MVP(uint16_t source, uint16_t dest, uint16_t length);
void MVP();
// NOP: No operation
void NOP();
@@ -769,6 +779,7 @@ class Cpu : public Loggable, public core::ExperimentFlags {
uint16_t last_call_frame_;
uint16_t next_pc_;
uint8_t next_pb_;
memory::CpuCallbacks callbacks_;
memory::Memory& memory;