asm! -> llvm_asm!

[chrysn]

Current c2rust produces assembler in the style of asm!("cpsie i" : : : "memory" : "volatile"), which is the style nowadays used with the llvm_asm macro since rust-lang/rust#71007 was merged.

A short-term solution I'm currently using as a workaround is to replace " asm!(" with " llvm_asm!(" in the output (hoping nobody puts this into literals); that's the route I'd like to take for a fix in c2rust as well. It has produced working binaries, though I'm not sure it ever passed through the asm code. (But hey, at least it built).

(A long-term solution might be using modern asm!, but a) that can wait until stable and b) it's probably better suited for a separate ... casm2rust? project, if it's ever really needed at all).

[chrysn]

A thing I missed originally (as I'm only using --emit-modules) but discovered in unrelated testing: The feature(asm) present when exporting transpiled code as a whole needs to become feature(llvm_asm) as well.

[chrysn]

The third occurrence of asm, global_asm!, seems to be unaffected by this transition, and did not have its name changed when asm was renamed to llvm_asm.

[ahomescu]

This makes sense to me, afaik when they introduced the new asm syntax they just renamed the old macro from asm! to llvm_asm!.

[fw-immunant]

Closing as this is no longer relevant: in current Rust, llvm_asm! is gone, asm! is stable since 1.59, and PR #374 landed translation that produces asm!. Anything left is tracked in #363.