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ASL: do not extend sign

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folkert van heusden 2022-03-31 10:21:27 +02:00
parent 1b155473d2
commit dd437e65db
1 changed files with 1 additions and 2 deletions
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3
cpu.cpp
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@ -1045,14 +1045,13 @@ bool cpu::single_operand_instructions(const uint16_t instr)
uint16_t a = getGAMAddress(dst_mode, dst_reg, word_mode, false); uint16_t a = getGAMAddress(dst_mode, dst_reg, word_mode, false);
int32_t vl = b -> read(a, word_mode); int32_t vl = b -> read(a, word_mode);
uint16_t v = (vl << 1) & (word_mode ? 0xff : 0xffff); uint16_t v = (vl << 1) & (word_mode ? 0xff : 0xffff);
uint16_t add = word_mode ? v & 0xff00 : 0;
setPSW_n(word_mode ? v & 0x80 : v & 0x8000); setPSW_n(word_mode ? v & 0x80 : v & 0x8000);
setPSW_z(v == 0); setPSW_z(v == 0);
setPSW_c(word_mode ? vl & 0x80 : vl & 0x8000); setPSW_c(word_mode ? vl & 0x80 : vl & 0x8000);
setPSW_v(getPSW_n() ^ getPSW_c()); setPSW_v(getPSW_n() ^ getPSW_c());
put_result(a, dst_mode, dst_reg, word_mode, v | add); put_result(a, dst_mode, dst_reg, word_mode, v);
} }
break; break;
} }