compiler: fix operator arg processing and subsampling size

[mloubout]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.45%. Comparing base (2413d19) to head (ea5f763).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2883      +/-   ##
==========================================
+ Coverage   83.43%   83.45%   +0.02%     
==========================================
  Files         248      248              
  Lines       51330    51371      +41     
  Branches     4428     4430       +2     
==========================================
+ Hits        42825    42870      +45     
+ Misses       7750     7749       -1     
+ Partials      755      752       -3     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.79% <61.90%> (-0.01%)	⬇️
pytest-gpu-gcc-	78.04% <94.33%> (+0.02%)	⬆️
pytest-gpu-icx-	77.66% <94.33%> (+0.01%)	⬆️
pytest-gpu-nvc-nvidiaX	69.31% <61.90%> (-0.03%)	⬇️

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[FabioLuporini]

if it's green , it's obviously uncontroversial