Forum Discussion

eheim's avatar
eheim
Icon for New Contributor rankNew Contributor
7 years ago
Solved

OpenCL Compiler Local Memory Address Space Splitter fails

Hello, when compiling my OpenCL kernels with AOCL 17.1, I get the following error: aoc: Optimizing and doing static analysis of code...aocl-opt: Value.cpp:287: void llvm::Value::replaceAllUsesWith(...
  • eheim's avatar
    eheim
    7 years ago

    Thank you for your reply, AKert. It is great to hear that my report is of some value. Meanwhile, I have found that the issue seems to be caused by reading from global memory and writing to an Intel FPGA channel in a single statement. When replacing

    UTL_WRITE_CH(ch_1, data1[j]);
UTL_WRITE_CH(ch_2, buf_d2[i]);

    with (make sure to use the actual types)

    const my_type1 temp1 data1[j]
UTL_WRITE_CH(ch_1, temp1);
 
const my_type2 temp2 buf_d2[i]
UTL_WRITE_CH(ch_2, temp2);

    the error goes away. It may or may not be related to also using char (8 bits) buffers.

Audrey_K_Intel's avatar
Audrey_K_Intel
Icon for New Contributor rankNew Contributor
7 years ago

Intel engineer here. The problem you have encountered is an assertion in the compiler code, which as you suspected (usually) indicates a bug in the tool, not a problem with the input. I can't see anything obviously wrong with your OpenCL code that would trigger this.

I've opened a ticket in the engineering system to have this looked at, with a cross-link to this post.

Thanks for taking the time to post this issue! This is valuable feedback; the fact that it crashes in multiple releases suggests a corner case we failed to consider. It's extremely helpful to have a minimal non-working example to debug from.