Hi, i got very recently access to a brand new Arm 64 V9 system and the official documentation says that, for GCC the following flags needs to be set to optimize:
-march=armv9-a: turn on cpu feature
-mcpu=neoverse-v2: turning compiled code to be best optimized for cpu
Still figuring out the flags for LLVM, but here is my actual question:
As I am currently cross compiling from an X86_64 box, I wonder if it's possible to get Rust to target and optimize for Arm V9?
I'd say target-cpu and target-feature are the rough equivalents of GCC's mcpu and march flags. I believe something like RUSTCFLAGS="--target-cpu=neoverse-v2" cargo build --release --target=aarch64-unknown-linux-gnu should generate an artefact optimized for a Linux system running on a Neoverse-V2 CPU.
Thank you; that is the solution.
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