>       /* Really format SS_b, but we pack both lengths into one argument
> @@ -735,6 +753,9 @@
>   /* PACK UNICODE */
>       C(0xe100, PKU,     SS_f,  E2,  la1, a2, 0, 0, pku, 0)
>   +/* POPULATION COUNT */
> +    C(0xb9e1, POPCNT,  RRE,   PC,  0, r2_o, r1, 0, popcnt, nz64)

You actually need RRF_c instead of RRE.

Otherwise QEMU aborts when the guest executes POPCNT as RRE does not
include the m3 field.


-- 
Thanks,

David / dhildenb


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