Add add/sub/and/or/xor methods that do not return previous value #47
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Look great to me. @YuhanLiin, if this works for you, I'll release |
YuhanLiin
reviewed
Dec 6, 2022
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Why not use triple slashes for this comment?
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If we want to stringify a macro metavariable using stringify!, we need to use the #[doc] attribute and string literal instead of the usual doc comment. In recent compilers (1.54+), #[doc = concat!(...)] also works, but in older compilers, a macro like this needs to be used.
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Yeah everything looks good to me. |
YuhanLiin
approved these changes
Dec 6, 2022
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Thanks both of you for the review! bors r+ |
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47: Add add/sub/and/or/xor methods that do not return previous value r=taiki-e a=taiki-e
This adds `Atomic{I,U}*::{add,sub,and,or,xor}` and `AtomicBool::{and,or,xor}` methods.
They are equivalent to the corresponding `fetch_*` methods, but do not return the previous value. They are intended for optimization on platforms that implement atomics using inline assembly, such as the MSP430.
Currently, optimizations by these methods (add,sub,and,or,xor) are only guaranteed for MSP430; on x86, LLVM can optimize in most cases, so cases, where this would improve things, should be rare.
See pftbest/msp430-atomic#7 for the context.
cc `@cr1901` `@YuhanLiin`
Co-authored-by: Taiki Endo <[email protected]>
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Published in 0.3.16. |
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This adds
Atomic{I,U}*::{add,sub,and,or,xor}andAtomicBool::{and,or,xor}methods.They are equivalent to the corresponding
fetch_*methods, but do not return the previous value. They are intended for optimization on platforms that implement atomics using inline assembly, such as the MSP430.Currently, optimizations by these methods (add,sub,and,or,xor) are only guaranteed for MSP430; on x86, LLVM can optimize in most cases, so cases, where this would improve things, should be rare.
See pftbest/msp430-atomic#7 for the context.
cc @cr1901 @YuhanLiin