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Patched fall-back method for cntlzw

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dingusdev 2020-12-14 08:27:13 -07:00
parent 0b5b56500f
commit b970a8d253
1 changed files with 8 additions and 3 deletions
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11
cpu/ppc/ppcopcodes.cpp
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@ -516,17 +516,22 @@ void dppc_interpreter::ppc_neg() {
void dppc_interpreter::ppc_cntlzw() {
ppc_grab_regssa();
uint32_t lead;
uint32_t lead = 0;
uint32_t mask = 0x80000000UL;
uint32_t bit_check = ppc_result_d;
#ifdef USE_GCC_BUILTINS
lead = !bit_check ? 32 : __builtin_clz(bit_check);
#elif defined USE_VS_BUILTINS
lead = __lzcnt(bit_check);
lead = !bit_check ? 32 : __lzcnt(bit_check);
#else
for (uint32_t mask = 0x80000000UL, lead = 0; mask; lead++, mask >>= 1) {
while (mask > 0){
if (bit_check & mask)
break;
else {
mask >>= 1;
lead++;
}
}
#endif
ppc_result_a = lead;