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Enable atomic cas for bpf targets #105708

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merged 1 commit into from
Jan 10, 2023
Merged

Enable atomic cas for bpf targets #105708

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6 changes: 5 additions & 1 deletion compiler/rustc_target/src/spec/bpf_base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ pub fn opts(endian: Endian) -> TargetOptions {
allow_asm: true,
endian,
linker_flavor: LinkerFlavor::Bpf,
atomic_cas: false,
atomic_cas: true,
dynamic_linking: true,
no_builtins: true,
panic_strategy: PanicStrategy::Abort,
Expand All @@ -19,6 +19,10 @@ pub fn opts(endian: Endian) -> TargetOptions {
obj_is_bitcode: true,
requires_lto: false,
singlethread: true,
// When targeting the `v3` cpu in llvm, 32-bit atomics are also supported.
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Is there any reason why anybody would want to use an older target-cpu with BPF targets?

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Support older kernels

// But making this value change based on the target cpu can be mostly confusing
// and would require a bit of a refactor.
min_atomic_width: Some(64),
max_atomic_width: Some(64),
..Default::default()
}
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