How Profile a program that have avx instructions

[Innocenzo_M_]

Hi, there is a tool or a Visual Studio plugin that give me how many SSE/AVX instructions there are in my code? How many SIMD Instruction I've performed? ecc. ecc. 

 

[Bernard]

One of the best tools for profiling SSE/AVX code is Intel VTune. You can also look at disassembled code and check for AVX machine code instructions.

[Bernard]

@Innocenzo,

Have a look at this Intel presentation: http://www.gdcvault.com/play/1014645

[Bernard]

Can you read this paper: https://software.intel.com/sites/default/files/article/394181/using-intel-vtune-amplifier-xe-on-4th-generation-intel-core-processors.pdf

[McCalpinJohn]

The floating-point arithmetic counters are disabled on Haswell processors -- perhaps because of accuracy problems with these events on Sandy Bridge and Ivy Bridge cores.  One of these days I will find a Broadwell or Skylake system to check the new floating-point counters that have been added on those processors.

[Bernard]

Theoretically you can count AVX machine code instructions which are executed and that way you asses how many GFLOPs were achieved. Of course this will be crude approximation of real result.

[Bernard]

Yes I know that. For simple loops like accumulation of variable it will work, but for complex nested loops with embedded control statement it will be hard and not accurate task.