folkert/KEK
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ASH etc flags

Browse source
This commit is contained in:
folkert van heusden 2023-03-20 14:00:49 +01:00
parent a57d89a045
commit 3761b177af
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 13 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
cpu.cpp
View file

@ -627,15 +627,23 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
if (shift == 0) {
setPSW_c(false);
setPSW_v(SIGN(R, false) != SIGN(oldR, false));
}
else if (shift < 32) {
else if (shift <= 15) {
R <<= shift;
setPSW_c(R & 0x10000);
setPSW_v((!!SIGN(oldR, false)) != (!!(R >> 15)));
}
else if (shift < 32) {
setPSW_c((R << (shift - 16)) & 1);
R = 0;
setPSW_v(!!oldR);
}
else if (shift == 32) {
R = -sign;
setPSW_c(sign);
setPSW_v(SIGN(R, false) != SIGN(oldR, false));
}
else {
int shift_n = (64 - shift) - 1;
@ -643,6 +651,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
R >>= shift_n;
setPSW_c(R & 1);
setPSW_v(SIGN(R, false) != SIGN(oldR, false));
R >>= 1;
}
@ -651,7 +660,6 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
setPSW_n(SIGN(R, false));
setPSW_z(R == 0);
setPSW_v(SIGN(R, false) != SIGN(oldR, false));
setRegister(reg, R);
@ -1179,11 +1187,12 @@ bool cpu::single_operand_instructions(const uint16_t instr)
v |= add;
setPSW_n(SIGN(v, word_mode));
setPSW_z(IS_0(v, word_mode));
setPSW_z(IS_0(v, false));
setPSW_c(SIGN(vl, word_mode));
setPSW_v(getPSW_n() ^ getPSW_c());
setRegister(dst_reg, false, v);
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
@ -1194,7 +1203,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (set_flags) {
setPSW_n(SIGN(v, word_mode));
setPSW_z(IS_0(v, word_mode));
setPSW_z(IS_0(v, false));
setPSW_c(SIGN(vl, word_mode));
setPSW_v(getPSW_n() ^ getPSW_c());
}