On 7/10/19 8:32 PM, Jan Bobek wrote: > On 7/3/19 5:49 PM, Richard Henderson wrote: >> On 7/1/19 6:35 AM, Jan Bobek wrote: >>> +MOVQ MMX 00001111 011 d 1110 !emit { rex(w => 1); modrm(mod >>> => MOD_DIRECT, rm => ~REG_ESP); } >>> +MOVQ_mem MMX 00001111 011 d 1110 !emit { rex(w => 1); modrm(mod >>> => ~MOD_DIRECT); mem(size => 8); } >> >> Oh, note that there are only 8 mmx registers, so the respective rex.{r,b} bit >> can't be set. > > Actually, my CPU chewed it without choking even when the bits were > set, but it will taken care of in v3.
That's interesting data. I wonder if it's worth retaining this as a feature in order to check qemu's implementation? r~