Debugging with GDB Manual The GNU Source-Level Debugger (769148-001, March 2014)

Some architectures have more than one commonly-used set of instruction mnemonics or other
syntax.
set disassembly-flavor
instruction-set
Select the instruction set to use when disassembling the
program via the disassemble or x/i commands.
Currently this command is only defined for the Intel x86
family. You can set instruction-set to either intel
or att. The default is att, the AT&T flavor used by default
by Unix assemblers for x86-based targets.
Source and machine code 57