aarch64: lower AtomicCAS128 to caspal when LSE is supported - #14141
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V3L0C1T13S wants to merge 2 commits into
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aarch64: lower AtomicCAS128 to caspal when LSE is supported#14141V3L0C1T13S wants to merge 2 commits into
AtomicCAS128 to caspal when LSE is supported#14141V3L0C1T13S wants to merge 2 commits into
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This PR adds support for lowering
AtomicCAS128by lowering it tocaspal, gated behindFEAT_LSE. Lowering tocaspalmakes it use acquire-release semantics like other atomics do.This is currently being used in a project I'm working on (privately for now) to emulate the semantics of an x86-64
cmpxchg16bon AArch64 and other backends that may eventually supportAtomicCAS128.