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Rollup merge of #105708 - tomerze:enable-atomic-cas-bpf, r=nagisa

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Enable atomic cas for bpf targets

It seems like LLVM now supports it.

https://reviews.llvm.org/D72184 - the PR in LLVM
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Yuki Okushi 2023-01-10 08:05:33 +09:00 • committed by GitHub
commit 5773e8baf0
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6
compiler/rustc_target/src/spec/bpf_base.rs
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@ -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,
@ -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.
// 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()
}