There are multiple mov mnemonics in the Intel syntax, so looking only at the mnemonics is not enough

• MOV within GPRs
• MOV to/from CR registers,
• MOV to/from DR registers

When adding suffixes the AT&T syntax is even more ambiguous since there are Intel instructions with q suffix in the mnemonic

• MOVD/MOVQ: move between GPR and mm/xmm registers
• MOVQ: move between mm/xmm registers or between mm/xmm register and memory

Here's the demo code. The AT&T asm doc always shows the vector version of MOVQ even though the instruction only acts on GPRs like movq %rsp, %rbp. On the Intel side CE can't recognize MOVs to/from control and debug registers

Other examples:

• CMPSD and MOVSD for vector operations
• CMPSD and MOVSD for string operations

For other cases like MOVSQ or CMPSQ we're lucky since dropping the suffix we still arrive at the same document page