Execution time of ippiDFTInv_CToC_32fc_C1R function in PSXE2016 is slower than PS2011

Hi everybody,

When I migrate source code from VS2008 + PS2011 + Intel C++ Complier (called project Before) to VS2015 + PSXE2016 + Intel C++ Complier (called project After).

I have the problem is: execution time of ippiDFTInv_CToC_32fc_C1R function in project [After] is slower than project [Before].

Detailed as below (About source code sample, please refer the attach file)

Before migration (ms)       After migration (ms)       Deviation (ms)

      20.076                               28.145                      8.069

Note: Configuration of PC

- OS: Win7 Enterprise SP1 64bit

- CPU: Intel Core i3-3220 (3.30 GHz)

- RAM: 8GB.

Currently, I don't know reason why execution time of ippiDFTInv_CToC_32fc_C1R function in project [After] is slower than project [Before].

Please help me explain it.

Best regards,

NhanPham.