[PATCH] D61050: [compiler-rt][builtins] Implement some fetch-and-x operations for Cortex-M

[Ayke via Phabricator via llvm-commits]

aykevl created this revision.
aykevl added a reviewer: howard.hinnant.
Herald added subscribers: Sanitizers, llvm-commits, kristof.beyls, javed.absar, dberris.
Herald added projects: LLVM, Sanitizers.

This patch adds support for the following builtins on the Cortex-M0 and Cortex-M3:

__sync_fetch_and_add_4
__sync_fetch_and_add_8
__sync_fetch_and_and_4
__sync_fetch_and_and_8
__sync_fetch_and_nand_4
__sync_fetch_and_nand_8
__sync_fetch_and_or_4
__sync_fetch_and_or_8
__sync_fetch_and_sub_4
__sync_fetch_and_sub_8
__sync_fetch_and_xor_4
__sync_fetch_and_xor_8

The assembly for Cortex-M3 and up could be slightly more efficient, but I've chosen to keep it simple so that all ARM processors can deal with it.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D61050

Files:
  lib/builtins/arm/sync-ops.h
  lib/builtins/arm/sync_fetch_and_add_8.S
  lib/builtins/arm/sync_fetch_and_and_8.S
  lib/builtins/arm/sync_fetch_and_max_8.S
  lib/builtins/arm/sync_fetch_and_nand_8.S
  lib/builtins/arm/sync_fetch_and_or_8.S
  lib/builtins/arm/sync_fetch_and_sub_8.S
  lib/builtins/arm/sync_fetch_and_xor_8.S

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