Actually use the llvm backend and not the khronos backend

[vchuravy]

As noticed by Simeon in #626 (comment)

[christiangnrd]

This could explain why we weren't encountering this issue over in OpenCL with validation on

[github-actions]

Benchmark Results

	main	e08d61a...	main / e08d61a...
saxpy/default/Float32/1024	0.0841 ± 0.012 ms	0.0861 ± 0.0086 ms	0.976 ± 0.17
saxpy/default/Float32/1048576	0.451 ± 0.027 ms	0.464 ± 0.024 ms	0.971 ± 0.076
saxpy/default/Float32/16384	0.0653 ± 0.033 ms	0.0675 ± 0.034 ms	0.968 ± 0.69
saxpy/default/Float32/2048	0.0813 ± 0.029 ms	0.0856 ± 0.024 ms	0.95 ± 0.43
saxpy/default/Float32/256	0.0836 ± 0.022 ms	0.0865 ± 0.013 ms	0.966 ± 0.29
saxpy/default/Float32/262144	0.165 ± 0.031 ms	0.167 ± 0.031 ms	0.988 ± 0.26
saxpy/default/Float32/32768	0.0692 ± 0.03 ms	0.0722 ± 0.031 ms	0.959 ± 0.59
saxpy/default/Float32/4096	0.0757 ± 0.03 ms	0.081 ± 0.03 ms	0.935 ± 0.51
saxpy/default/Float32/512	0.0833 ± 0.021 ms	0.0856 ± 0.0088 ms	0.973 ± 0.26
saxpy/default/Float32/64	0.0825 ± 0.027 ms	0.0864 ± 0.013 ms	0.955 ± 0.34
saxpy/default/Float32/65536	0.0834 ± 0.03 ms	0.086 ± 0.031 ms	0.969 ± 0.49
saxpy/default/Float64/1024	0.0839 ± 0.024 ms	0.085 ± 0.015 ms	0.987 ± 0.33
saxpy/default/Float64/1048576	0.58 ± 0.058 ms	0.576 ± 0.071 ms	1.01 ± 0.16
saxpy/default/Float64/16384	0.065 ± 0.029 ms	0.0706 ± 0.03 ms	0.921 ± 0.57
saxpy/default/Float64/2048	0.0805 ± 0.032 ms	0.0853 ± 0.026 ms	0.944 ± 0.48
saxpy/default/Float64/256	0.0842 ± 0.013 ms	0.0854 ± 0.01 ms	0.986 ± 0.19
saxpy/default/Float64/262144	0.198 ± 0.037 ms	0.199 ± 0.038 ms	0.994 ± 0.27
saxpy/default/Float64/32768	0.0751 ± 0.029 ms	0.0787 ± 0.029 ms	0.954 ± 0.51
saxpy/default/Float64/4096	0.0758 ± 0.03 ms	0.0781 ± 0.03 ms	0.971 ± 0.53
saxpy/default/Float64/512	0.0838 ± 0.026 ms	0.0855 ± 0.0079 ms	0.98 ± 0.32
saxpy/default/Float64/64	0.0843 ± 0.023 ms	0.086 ± 0.013 ms	0.98 ± 0.3
saxpy/default/Float64/65536	0.0921 ± 0.029 ms	0.096 ± 0.031 ms	0.959 ± 0.43
saxpy/static workgroup=(1024,)/Float32/1024	0.082 ± 0.012 ms	0.0832 ± 0.0073 ms	0.986 ± 0.17
saxpy/static workgroup=(1024,)/Float32/1048576	0.455 ± 0.022 ms	0.461 ± 0.023 ms	0.986 ± 0.068
saxpy/static workgroup=(1024,)/Float32/16384	0.0627 ± 0.031 ms	0.0638 ± 0.032 ms	0.982 ± 0.69
saxpy/static workgroup=(1024,)/Float32/2048	0.0802 ± 0.03 ms	0.0821 ± 0.027 ms	0.977 ± 0.48
saxpy/static workgroup=(1024,)/Float32/256	0.0825 ± 0.019 ms	0.0839 ± 0.013 ms	0.984 ± 0.28
saxpy/static workgroup=(1024,)/Float32/262144	0.166 ± 0.029 ms	0.165 ± 0.028 ms	1.01 ± 0.25
saxpy/static workgroup=(1024,)/Float32/32768	0.0666 ± 0.027 ms	0.0697 ± 0.029 ms	0.956 ± 0.55
saxpy/static workgroup=(1024,)/Float32/4096	0.075 ± 0.03 ms	0.0831 ± 0.029 ms	0.902 ± 0.48
saxpy/static workgroup=(1024,)/Float32/512	0.0823 ± 0.013 ms	0.0832 ± 0.015 ms	0.989 ± 0.23
saxpy/static workgroup=(1024,)/Float32/64	0.0825 ± 0.021 ms	0.0839 ± 0.015 ms	0.984 ± 0.31
saxpy/static workgroup=(1024,)/Float32/65536	0.0808 ± 0.029 ms	0.0838 ± 0.031 ms	0.964 ± 0.49
saxpy/static workgroup=(1024,)/Float64/1024	0.0814 ± 0.023 ms	0.0826 ± 0.017 ms	0.985 ± 0.34
saxpy/static workgroup=(1024,)/Float64/1048576	0.57 ± 0.051 ms	0.574 ± 0.054 ms	0.994 ± 0.13
saxpy/static workgroup=(1024,)/Float64/16384	0.0626 ± 0.028 ms	0.0673 ± 0.029 ms	0.931 ± 0.57
saxpy/static workgroup=(1024,)/Float64/2048	0.078 ± 0.032 ms	0.0823 ± 0.029 ms	0.948 ± 0.52
saxpy/static workgroup=(1024,)/Float64/256	0.0824 ± 0.017 ms	0.0835 ± 0.014 ms	0.987 ± 0.26
saxpy/static workgroup=(1024,)/Float64/262144	0.194 ± 0.032 ms	0.192 ± 0.032 ms	1.01 ± 0.24
saxpy/static workgroup=(1024,)/Float64/32768	0.0713 ± 0.026 ms	0.0754 ± 0.027 ms	0.946 ± 0.48
saxpy/static workgroup=(1024,)/Float64/4096	0.0735 ± 0.03 ms	0.0767 ± 0.03 ms	0.958 ± 0.54
saxpy/static workgroup=(1024,)/Float64/512	0.0818 ± 0.011 ms	0.083 ± 0.0086 ms	0.985 ± 0.17
saxpy/static workgroup=(1024,)/Float64/64	0.0819 ± 0.027 ms	0.0836 ± 0.017 ms	0.979 ± 0.38
saxpy/static workgroup=(1024,)/Float64/65536	0.0901 ± 0.027 ms	0.0916 ± 0.028 ms	0.984 ± 0.42
time_to_load	0.975 ± 0.0061 s	0.968 ± 0.0085 s	1.01 ± 0.011

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.21%. Comparing base (0586ae6) to head (e08d61a).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #706   +/-   ##
=======================================
  Coverage   52.21%   52.21%           
=======================================
  Files          22       22           
  Lines        1691     1691           
=======================================
  Hits          883      883           
  Misses        808      808           

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