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A comment on AMD Claims Arm ISA Doesn't Offer Efficiency Advantage over x86. Parent comment

Re:AMD Claims Arm ISA Doesn't Offer Efficiency Advantage ove... by wvenable on Monday September 08, 2025 @07:23PM (#45175434)
I believe it's the `lock xadd` instruction. It's faster when combined with x86 Total Store Ordering mode that the Rosetta emulation runs under.
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Re:AMD Claims Arm ISA Doesn't Offer Efficiency Advantage ove... by saagarjha on Monday September 08, 2025 @09:11PM (#45176214)
Looking at objc_retain apparently it's a lock cmpxchg these days
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