On 2016.09.21 at 17:48 +0000, Mahmood Naderan wrote: > OK guys... > (gdb) x/i $pc > => 0x8fdb6e <zdot_kernel_8+334>: vfmadd231pd %xmm8,%xmm12,%xmm0 > > So, the instruction is vfmadd231pd > > Any idea? It is an FMA3 instruction. See: https://en.wikipedia.org/wiki/FMA_instruction_set -- Markus
