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.text _start: rex/fxsave (%rax) rex64/fxsave (%rax) rex/fxsave (%r8) rex64/fxsave (%r8) rex/fxsave (,%r8) rex64/fxsave (,%r8) rex/fxsave (%r8,%r8) rex64/fxsave (%r8,%r8) # Test prefixes family. rex rex.B rex.X rex.XB rex.R rex.RB rex.RX rex.RXB rex.W rex.WB rex.WX rex.WXB rex.WR rex.WRB rex.WRX rex.WRXB