https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1369877#M6967 <P>Hey guys,</P> <P>Working on a kernel that uses the OpenCL 128-bit '<EM>unsigned long long'</EM> datatype, the compiler errors out when fed too many XOR-swap with modulus operations using operands of this type.</P> <P>Proof of concept kernel:</P> <LI-CODE lang="cpp">__kernel void test(__private const uint test) { // 128-bit unsigned integers. __private unsigned long long a, b; a = 15; b = 103; while (a != 0) { // XOR-swap. a ^= b; b ^= a; a ^= b; // MOD. a %= b; } } </LI-CODE> <P>Output when compiling (Intel OpenCL CPU Runtime 18.1, Linux):</P> <LI-CODE lang="markup">**Internal compiler error** Program used external function '__umodti3' which could not be resolved! Please report the issue on Intel OpenCL forum https://software.intel.com/en-us/forums/opencl for assistance. Aborted (core dumped) </LI-CODE> <P>Kernels not using 'unsigned long long' run fine on same system. </P> <P>Any help is appreciated <LI-EMOJI id="lia_slightly-smiling-face" title=":slightly_smiling_face:"></LI-EMOJI></P> Fri, 18 Mar 2022 00:33:25 GMT kzwarthoed 2022-03-18T00:33:25Z https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1369877#M6967 <P>Hey guys,</P> <P>Working on a kernel that uses the OpenCL 128-bit '<EM>unsigned long long'</EM> datatype, the compiler errors out when fed too many XOR-swap with modulus operations using operands of this type.</P> <P>Proof of concept kernel:</P> <LI-CODE lang="cpp">__kernel void test(__private const uint test) { // 128-bit unsigned integers. __private unsigned long long a, b; a = 15; b = 103; while (a != 0) { // XOR-swap. a ^= b; b ^= a; a ^= b; // MOD. a %= b; } } </LI-CODE> <P>Output when compiling (Intel OpenCL CPU Runtime 18.1, Linux):</P> <LI-CODE lang="markup">**Internal compiler error** Program used external function '__umodti3' which could not be resolved! Please report the issue on Intel OpenCL forum https://software.intel.com/en-us/forums/opencl for assistance. Aborted (core dumped) </LI-CODE> <P>Kernels not using 'unsigned long long' run fine on same system. </P> <P>Any help is appreciated <LI-EMOJI id="lia_slightly-smiling-face" title=":slightly_smiling_face:"></LI-EMOJI></P> Fri, 18 Mar 2022 00:33:25 GMT https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1369877#M6967 kzwarthoed 2022-03-18T00:33:25Z https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1374711#M6996 <P>Hi,</P><P><BR /></P><P>Can you try the latest OpenCL CPU RT 2022.0? You can download it from <A href="https://www.intel.com/content/www/us/en/developer/articles/technical/intel-cpu-runtime-for-opencl-applications-with-sycl-support.html" target="_blank">https://www.intel.com/content/www/us/en/developer/articles/technical/intel-cpu-runtime-for-opencl-applications-with-sycl-support.html</A></P><P><BR /></P><P>Thanks</P><BR /> Wed, 06 Apr 2022 07:07:20 GMT https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1374711#M6996 cw_intel 2022-04-06T07:07:20Z https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1394415#M7060 <P>Hi,</P><P><BR /></P><P>We haven't heard back from you for a long time so we are assuming that the provided details helped you in solving your problem. If you require additional assistance from Intel, please start a new thread.&nbsp;Any further interaction in this thread will be considered community only.</P><P><BR /></P><P>Thanks</P><BR /> Wed, 22 Jun 2022 06:31:06 GMT https://community.intel.com/t5/OpenCL-for-CPU/Internal-compiler-error-Program-used-external-function-umodti3/m-p/1394415#M7060 cw_intel 2022-06-22T06:31:06Z