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poweropcodes: Fix sllq.

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Test bit 26 of rB instead of using >= 0x20 to determine which operation to perform.
Since the mask is not complicated, we don't need to use power_rot_mask.
This commit is contained in:
joevt 2024-04-09 02:21:39 -07:00 committed by dingusdev
parent e1f31a2da3
commit e8273ecc61
1 changed files with 4 additions and 7 deletions
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11
cpu/ppc/poweropcodes.cpp
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@ -458,14 +458,11 @@ template <field_rc rec>
void dppc_interpreter::power_sllq() {
ppc_grab_regssab(ppc_cur_instruction);
unsigned rot_sh = ppc_result_b & 0x1F;
uint32_t r = ((ppc_result_d << rot_sh) | (ppc_result_d >> (32 - rot_sh)));
uint32_t mask = power_rot_mask(0, 31 - rot_sh);
if (ppc_result_b >= 0x20) {
ppc_result_a = (ppc_state.spr[SPR::MQ] & mask);
}
else {
ppc_result_a = ((r & mask) | (ppc_state.spr[SPR::MQ] & ~mask));
if (ppc_result_b & 0x20) {
ppc_result_a = ppc_state.spr[SPR::MQ] & (-1U << rot_sh);
} else {
ppc_result_a = ((ppc_result_d << rot_sh) | (ppc_state.spr[SPR::MQ] & ((1 << rot_sh) - 1)));
}
if (rec)