[rustc.git] / compiler / rustc_error_codes / src / error_codes / E0668.md

#### Note: this error code is no longer emitted by the compiler.

Malformed inline assembly rejected by LLVM.

Erroneous code example:

```ignore (no longer emitted)
#![feature(llvm_asm)]

fn main() {
    let rax: u64;
    unsafe {
        llvm_asm!("" :"={rax"(rax));
        println!("Accumulator is: {}", rax);
    }
}
```

LLVM checks the validity of the constraints and the assembly string passed to
it. This error implies that LLVM seems something wrong with the inline
assembly call.

In particular, it can happen if you forgot the closing bracket of a register
constraint (see issue #51430), like in the previous code example.
Commit	Line	Data
5099ac24 FG	1	#### Note: this error code is no longer emitted by the compiler.
5099ac24 FG	2
60c5eb7d XL	3	Malformed inline assembly rejected by LLVM.
60c5eb7d XL	4
f035d41b	5	Erroneous code example:
60c5eb7d	6
5099ac24	7	```ignore (no longer emitted)
ba9703b0	8	#![feature(llvm_asm)]
60c5eb7d XL	9
	10	fn main() {
	11	let rax: u64;
	12	unsafe {
ba9703b0	13	llvm_asm!("" :"={rax"(rax));
60c5eb7d XL	14	println!("Accumulator is: {}", rax);
	15	}
	16	}
	17	```
f035d41b XL	18
	19	LLVM checks the validity of the constraints and the assembly string passed to
	20	it. This error implies that LLVM seems something wrong with the inline
	21	assembly call.
	22
	23	In particular, it can happen if you forgot the closing bracket of a register
	24	constraint (see issue #51430), like in the previous code example.