xiaoxiang781216 commented on PR #14181:
URL: https://github.com/apache/nuttx/pull/14181#issuecomment-2408787289

   > @yangsong8-ai please include a commit log message explaining why to use 
r1-r3 instead of the original r2-r4. Maybe r1 used to have some 
specific/important function
   
   since r4 can't be used directly without saving into stack, so it's morr 
simple to only use r1 to r3.


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