[GitHub] [incubator-nuttx] gustavonihei opened a new pull request #5143: xtensa/esp32: Use ROM implementations of libc functions

[GitBox <gi...@apache.org>]

gustavonihei opened a new pull request #5143:
URL: https://github.com/apache/incubator-nuttx/pull/5143


   ## Summary
   This PR intends to make use of available ROM implementations of libc functions on ESP32.
   
   ## Impact
   ROM functions may be accessed while the MMU and Flash Cache is disabled, which contributes to the execution in SMP mode.
   Depending on the usage scenario, usage of ROM function may result in minor increment to code size due to the effect of `-mlongcalls`: 
   Calling `strlen` from FLASH:
   ```asm
   400dd51c:	0110e5        	call8	400de62c <strlen>
   ```
   Calling `strlen` from Internal ROM:
   ```asm
   400dd6a8:	caa281        	l32r	a8, 400d0130 <_stext+0x110>
   400dd6ab:	0008e0        	callx8	a8
   ```
   
   ## Testing
   CI build pass and object code and map file inspection.


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[GitHub] [incubator-nuttx] acassis merged pull request #5143: xtensa/esp32: Use ROM implementations of libc functions

[GitBox <gi...@apache.org>]

acassis merged pull request #5143:
URL: https://github.com/apache/incubator-nuttx/pull/5143


   


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