Martin Stein b04a70177b base & arm: simplify and optimize cmpxchg
The old inline assembly provided two output operands that were afterwards
combined for a return value. However, the second output operand isn't
necessary when using the "Acquiring a Lock" example-code of the ARM manual
"Barrier Litmus Tests and Cookbook". This saves two logical operations
per acquisition try. Additionally better documentation is now provided.

Fixes #1292
2019-04-01 19:33:47 +02:00
..
2017-05-31 13:16:07 +02:00

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