ConclusionĪssembly is a language that many developers don’t use on a daily basis, but it can still be fun and educational to see how code manipulates the CPU directly. The syntax is nice and compact given the complexity of crossing the Rust/assembly boundary. The inout(reg) x statement indicates that the compiler should find a suitable general-purpose register, prepare that register with the current value of x, store the output of the add instruction in the same general-purpose register, then store the value of that general-purpose register in x. Println!("All ", inout(reg) x, number = const 5) To view the assembly output of each tool, we’ll use the following example program. In this guide, we’ll explore what the Rust community has to offer for extracting and embedding assembly. Rust also has facilities for embedding assembly. The Rust compiler emits various types of output, one of which is assembly. In diagnosing performance issues like this, inspecting the output of the compiler can be helpful. However, modern compilers are complicated programs in and of themselves and may yield binaries that perform very differently in response to a minor change in the source code. For many Rust developers, the process of producing a binary from their Rust code is a straightforward process that doesn’t require much thought.
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