warning: xx.cl:x:x: loop not unrolled: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering

Description

Due to a problem in the Intel® FPGA SDK for OpenCL version 19.3, this false warning may be produced when unrolling a loop which includes reads/writes from an array of channels. This loop is correctly unrolled.

Resolution

This problem is fixed in Intel® FPGA SDK for OpenCL software version 20.2.