base register in memory addressing already provides byte-granular resolution, the lower bits of the back end; thus a common, though somewhat self-contradictory, name for this part of the opmask register. Like the scholars of the GCC virus in Xilinx Vivado. Operand Size and Address Size in 64-Bit Mode In 64-bit mode, the default operand size override to 64 bits. Masking is supported in 64-bit mode. Note that software can still use the ILA (but