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poweropcodes: Fix sraq.

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If bit 26 of rB is set then the mask should be all ones.
If bit 26 of rB is set then rA should be all ones or all zeros (depending on the sign bit of rA).
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joevt 2024-04-09 02:29:13 -07:00 committed by dingusdev
parent 2b8f510603
commit a928c67913
1 changed files with 2 additions and 2 deletions
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4
cpu/ppc/poweropcodes.cpp
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@ -521,8 +521,8 @@ template <field_rc rec>
void dppc_interpreter::power_sraq() {
ppc_grab_regssab(ppc_cur_instruction);
unsigned rot_sh = ppc_result_b & 0x1F;
uint32_t mask = (1 << rot_sh) - 1;
ppc_result_a = (int32_t)ppc_result_d >> rot_sh;
uint32_t mask = (ppc_result_b & 0x20) ? -1 : (1 << rot_sh) - 1;
ppc_result_a = (int32_t)ppc_result_d >> ((ppc_result_b & 0x20) ? 31 : rot_sh);
ppc_state.spr[SPR::MQ] = ((ppc_result_d << rot_sh) | (ppc_result_d >> (32 - rot_sh)));
if ((int32_t(ppc_result_d) < 0) && (ppc_result_d & mask)) {