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ppcopcodes: fix cntlzw with __builtin_clz.
The result of __builtin_clz is undefined when the source operand is zero. Add a check for this case and handle it accordingly.
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@ -516,15 +516,15 @@ void dppc_interpreter::ppc_neg() {
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void dppc_interpreter::ppc_cntlzw() {
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ppc_grab_regssa();
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uint32_t lead = 0;
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uint32_t lead;
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uint32_t bit_check = ppc_result_d;
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#ifdef USE_GCC_BUILTINS
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lead = __builtin_clz(bit_check);
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lead = !bit_check ? 32 : __builtin_clz(bit_check);
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#elif defined USE_VS_BUILTINS
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lead = __lzcnt(bit_check);
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#else
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for (uint32_t mask = 0x80000000UL; mask; lead++, mask >>= 1) {
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for (uint32_t mask = 0x80000000UL, lead = 0; mask; lead++, mask >>= 1) {
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if (bit_check & mask)
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break;
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}
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