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ppcopcodes: Fix sraw.

This commit is contained in:
joevt 2023-12-16 22:01:02 -08:00 committed by Maxim Poliakovski
parent 4c49558120
commit 0a8c1df968
1 changed files with 10 additions and 8 deletions
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18
cpu/ppc/ppcopcodes.cpp
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@ -682,18 +682,20 @@ void dppc_interpreter::ppc_srw() {
void dppc_interpreter::ppc_sraw() {
ppc_grab_regssab();
// clear XER[CA] by default
ppc_state.spr[SPR::XER] &= ~XER::CA;
if (ppc_result_b & 0x20) {
// fill rA with the sign bit of rS
ppc_result_a = (int32_t)ppc_result_d >> 31;
ppc_state.spr[SPR::XER] |= (ppc_result_a & 1) << 29;
if (ppc_result_a) // if rA is negative
ppc_state.spr[SPR::XER] |= XER::CA;
} else {
uint32_t shift = ppc_result_b & 0x1F;
uint32_t mask = (1U << shift) - 1;
ppc_result_a = (int32_t)ppc_result_d >> shift;
if ((ppc_result_d & 0x80000000UL) && (ppc_result_d & mask)) {
ppc_state.spr[SPR::XER] |= 0x20000000UL;
} else {
ppc_state.spr[SPR::XER] &= 0xDFFFFFFFUL;
}
ppc_result_a = (int32_t)ppc_result_d >> shift;
if ((ppc_result_d & 0x80000000UL) && (ppc_result_d & ((1U << shift) - 1)))
ppc_state.spr[SPR::XER] |= XER::CA;
}
if (rc_flag)