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Implements shifts and rotates.

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This commit is contained in:
Thomas Harte 2021-01-20 21:39:13 -05:00
parent 8564e7406b
commit 64d556f60f
1 changed files with 29 additions and 1 deletions
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30
InstructionSets/M50740/Executor.cpp
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@ -350,7 +350,35 @@ template <Operation operation> void Executor::perform(uint8_t *operand [[maybe_u
// TODO:
//
// BRK, STP,
// ADC, SBC, BIT, ASL, LSR, ROL, ROR, RRF
// ADC, SBC, BIT
case Operation::ASL:
carry_flag_ = *operand >> 7;
*operand <<= 1;
set_nz(*operand);
break;
case Operation::LSR:
carry_flag_ = *operand & 1;
*operand >>= 1;
set_nz(*operand);
break;
case Operation::ROL: {
const uint8_t temp8 = uint8_t((*operand << 1) | carry_flag_);
carry_flag_ = *operand >> 7;
set_nz(*operand = temp8);
} break;
case Operation::ROR: {
const uint8_t temp8 = uint8_t((*operand >> 1) | (carry_flag_ << 7));
carry_flag_ = *operand & 1;
set_nz(*operand = temp8);
} break;
case Operation::RRF:
*operand = uint8_t((*operand >> 4) | (*operand << 4));
break;
/*
Operations affected by the index mode flag: ADC, AND, CMP, EOR, LDA, ORA, and SBC.