"for" cycle optimization issue | Rust Programming Language Community | Page 1

#

The programs on the pictures above print numbers from set {4*n | n ∈ [0; 31] ⋂ Z }
Both cycles do the same thing, but rust "for" cycle has more lines in the assembly code and works a bit slower
Why compiler does not optimize this "for" cycle to be as fast as "while" one?
Flags are -C opt-level=3 -C target-cpu=native

#

Program with "while" cycle:
https://godbolt.org/z/eKaWaPz59

Compiler Explorer - Rust (rustc 1.68.0)

pub fn main() {
let mut i: u32 = 0;
while i != 128 {
println!("{0}", i);
i += 4;
}
}

#

Program with the "for" cycle:
https://godbolt.org/z/W1xbbe9E9

Compiler Explorer - Rust (rustc 1.68.0)

pub fn main() {
for i in (0u32..128u32).step_by(4) {
println!("{0}", i);
}
}

#"for" cycle optimization issue