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ASHC fix (see ASH)

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folkert van heusden 2022-03-19 22:09:19 +01:00
parent d71f441877
commit 52bdfbdaa1
1 changed files with 3 additions and 2 deletions
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5
cpu.cpp
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@ -495,7 +495,8 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 3: { // ASHC
uint32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg + 1);
int16_t shift = getGAM(dst_mode, dst_reg, true, false);
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
int16_t shift = b->read(a, false);
if (shift > 0) {
R0R1 <<= (shift & 0b111111) - 1;
@ -503,7 +504,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
R0R1 <<= 1;
}
else if (shift < 0) {
R0R1 >>= -(shift & 0b111111) - 1;
R0R1 >>= -((shift & 0b111111) - 1);
setPSW_c(R0R1 & 1);
R0R1 >>= 1;
}