https://bugs.kde.org/show_bug.cgi?id=487439

--- Comment #5 from Paul Floyd <pjfl...@wanadoo.fr> ---
This looks like
66 48 0f 73 f1 0c rex.W psllq xmm1,0xc

Some more from the log

vex amd64->IR: unhandled instruction bytes: 0x66 0x48 0xF 0x73 0xF1 0xC 0x66
0xF 0x70 0xF5
vex amd64->IR:   REX=1 REX.W=1 REX.R=0 REX.X=0 REX.B=0
vex amd64->IR:   VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F
vex amd64->IR:   PFX.66=1 PFX.F2=0 PFX.F3=0

"psllq" should be handled, but it looks like it's the REX prefix that is
causing the problem.

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