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[linker script, crt0] align all sections to 32-bit boundaries #323

Merged
merged 3 commits into from
May 21, 2022
Merged

[linker script, crt0] align all sections to 32-bit boundaries #323

merged 3 commits into from
May 21, 2022

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stnolting
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This PR modifies the default NEORV32 linker script and start-up code (crt0):

  • all relevant sections start and end on a 32-bit (word) aligned boundary
  • crt0 can use word-level memory operations instead of byte-level memory operations to initialize .data and clear .bss sections (faster booting / start-up!)

@stnolting
align all sections
5d7b44c 
sections start and end on a 32-bit (word) aligned boundary
@stnolting stnolting added the optimization Make things faster, smaller and more efficient label May 20, 2022
@stnolting stnolting self-assigned this May 20, 2022
@stnolting stnolting changed the title [linker script, crt0] align all sections [linker script, crt0] align all sections to 32-bit boaundaries May 20, 2022
@stnolting stnolting added the SW software-related label May 20, 2022
@stnolting stnolting changed the title [linker script, crt0] align all sections to 32-bit boaundaries [linker script, crt0] align all sections to 32-bit boundaries May 20, 2022
@stnolting stnolting marked this pull request as draft May 20, 2022 21:15
@stnolting
[crt0] use word-level memory operations
5f47404 
* minor comment edits
* faster init of .data section
* faster clearing of .bss section
* => faster start-up / booting
@stnolting
[docs] added note regarding section alignment
d3caaf9
@stnolting stnolting marked this pull request as ready for review May 20, 2022 21:37
@stnolting stnolting mentioned this pull request May 21, 2022
Merged
@stnolting stnolting merged commit ee494d9 into main May 21, 2022
@stnolting stnolting deleted the align_sections branch May 21, 2022 13:32
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