[experiment] enable outline-atomics on more aarch64 platforms #144938
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Add dynamic support for aarch64 LSE atomic ops on linux targets when optimized-compiler-builtins is not enabled. A hook, __enable_rust_lse, is provided for the runtime to enable them if available. A future patch will use this to enable them if available. The resulting asm should exactly match that of LLVM's compiler-rt builtins, though the symbol naming for the support function and global does not. (cherry picked from commit 3da32fb)
Create a private module to hold the bootstrap code needed enable LSE at startup on aarch64-*-linux-* targets when rust implements the intrinsics. This is a bit more heavyweight than compiler-rt's LSE initialization, but has the benefit of initializing the aarch64 cpu feature detection for other uses. Using the rust initialization code does use some atomic operations, that's OK. Mixing LSE and non-LSE operations should work while the update flag propagates. (cherry picked from commit 1c36432)
This is a feature used by LLVM that is enabled for our `aarch64-linux` targets, which we would like to configure on in `std`. Thus, mark `outline-atomics` a known feature. It is left unstable for now. (cherry picked from commit 24c770b)
Build the symbols whenever outline atomics is in our baseline.
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[experiment] enable outline-atomics on more aarch64 platforms try-job: arm-android try-job: dist-android try-job: dist-x86_64-freebsd try-job: dist-aarch64-windows-gnullvm try-job: dist-aarch64-apple try-job: aarch64-msvc-1 try-job: aarch64-msvc-2 try-job: dist-aarch64-msvc
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[experiment] enable outline-atomics on more aarch64 platforms try-job: arm-android try-job: dist-android try-job: dist-x86_64-freebsd try-job: dist-aarch64-windows-gnullvm try-job: dist-aarch64-apple try-job: aarch64-msvc-1 try-job: aarch64-msvc-2 try-job: dist-aarch64-msvc
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try-job: arm-android
try-job: dist-android
try-job: dist-x86_64-freebsd
try-job: dist-aarch64-windows-gnullvm
try-job: dist-aarch64-apple
try-job: aarch64-msvc-1
try-job: aarch64-msvc-2
try-job: dist-aarch64-msvc