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[compiler-rt][builtins] Implement some fetch-and-x operations for Cortex-M
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Authored by aykevl on Apr 23 2019, 6:54 PM.

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Reviewers
howard.hinnant
Summary

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.

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aykevl created this revision.Apr 23 2019, 6:54 PM
Herald added projects: Restricted Project, Restricted Project. · View Herald TranscriptApr 23 2019, 6:54 PM
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aykevl abandoned this revision.Apr 23 2019, 6:54 PM

wrong patch