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folkert van heusden 2024-04-22 15:45:07 +02:00
parent f0bb29fed3
commit 046dc7d579
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 10 additions and 1 deletions
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11
cpu.cpp
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@ -831,6 +831,15 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
setPSW_v(SIGN(R, wm_word) != SIGN(oldR, wm_word));
}
else {
int shift_n = 64 - shift;
uint32_t sign_extend = sign ? 0x8000 : 0;
for(int i=0; i<shift_n; i++) {
setPSW_c(R & 1);
R >>= 1;
R |= sign_extend;
}
/*
int shift_n = 64 - shift;
uint16_t new_value = (sign ? uint64_t(0xffffffff0000) : 0) | R;
@ -839,7 +848,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
new_value >>= 1;
R = new_value;
*/
setPSW_v(SIGN(R, wm_word) != SIGN(oldR, wm_word));
}