sycl : add build instructions

[Nuullll]

Tested with oneAPI 2024.2, building is okay on windows.

Compiler Version

icx --version                 
Intel(R) oneAPI DPC++/C++ Compiler for applications running on Intel(R) 64, Version 2024.2.0 Build 20240602
Copyright (C) 1985-2024 Intel Corporation. All rights reserved.

Intel(R) oneAPI DPC++/C++ Compiler 2024.2.0 (2024.2.0.20240602)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files (x86)\Intel\oneAPI\compiler\2024.2\bin\compiler
Configuration file: C:\Program Files (x86)\Intel\oneAPI\compiler\2024.2\bin\compiler\..\icx.cfg

Devices

# I've installed multiple oneAPI variants -- some devices were duplicated...
sycl-ls
[opencl:cpu][opencl:0] Intel(R) OpenCL, 13th Gen Intel(R) Core(TM) i9-13900 OpenCL 3.0 (Build 0) [2024.18.6.0.02_160000]
[opencl:gpu][opencl:1] Intel(R) OpenCL Graphics, Intel(R) Arc(TM) A770 Graphics OpenCL 3.0 NEO  [31.0.101.5522]
[opencl:gpu][opencl:2] Intel(R) OpenCL Graphics, Intel(R) Arc(TM) A750 Graphics OpenCL 3.0 NEO  [31.0.101.5522]
[opencl:cpu][opencl:3] Intel(R) OpenCL, 13th Gen Intel(R) Core(TM) i9-13900 OpenCL 3.0 (Build 0) [2023.16.12.0.12_195853.xmain-hotfix]
[opencl:fpga][opencl:4] Intel(R) FPGA Emulation Platform for OpenCL(TM), Intel(R) FPGA Emulation Device OpenCL 1.2  [2023.16.12.0.12_195853.xmain-hotfix]
[opencl:cpu][opencl:5] Intel(R) OpenCL, 13th Gen Intel(R) Core(TM) i9-13900 OpenCL 3.0 (Build 0) [2024.17.3.0.08_160000]
[opencl:fpga][opencl:6] Intel(R) FPGA Emulation Platform for OpenCL(TM), Intel(R) FPGA Emulation Device OpenCL 1.2  [2024.17.3.0.08_160000]
[level_zero:gpu][level_zero:0] Intel(R) Level-Zero, Intel(R) Arc(TM) A770 Graphics 1.3 [1.3.29283]
[level_zero:gpu][level_zero:1] Intel(R) Level-Zero, Intel(R) Arc(TM) A750 Graphics 1.3 [1.3.29283]

Running test-backend-ops

Using i9-13900 CPU as a SYCL device

set ONEAPI_DEVICE_SELECTOR=opencl:0
.\bin\test-backend-ops.exe

sycl-cpu-test.txt

134 MUL_MAT failures and 1 assertion in ROPE (blocking remaining tests).

Using Intel Arc A770 GPU as a SYCL device

set ONEAPI_DEVICE_SELECTOR=level_zero:0
.\bin\test-backend-ops.exe

sycl-gpu-test.txt

223 failures (4 NORM, 4 RMS_NORM, 164 MUL_MAT, 51 SOFT_MAX) and 1 assertion in ROPE (blocking remaining tests).

[ggerganov]

After #865 there should be SYCL build support - please give it a try as it is not tested yet and suggest improvements / build instructions

[Nuullll]

After #865 there should be SYCL build support - please give it a try as it is not tested yet and suggest improvements / build instructions

Thanks, didn't notice that. It's almost working on windows except the minor change I made.

[slaren]

Can you submit this change as a PR to the llama.cpp repository so that other SYCL developers can take a look? The windows SYCL CI in llama.cpp seems to be working correctly without these changes.

[Nuullll]

Can you submit this change as a PR to the llama.cpp repository so that other SYCL developers can take a look? The windows SYCL CI in llama.cpp seems to be working correctly without these changes.

Thanks for the hint! Using MSVC as C compiler resolves the issue, updated the build instructions.