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perf: optimize f32_vec_to_bytes and bytes_to_f32_vec #12618

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Merged
alexcrichton merged 1 commit into from
Feb 18, 2026
+3 −9
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perf: optimize f32_vec_to_bytes and bytes_to_f32_vec #12618

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12 changes: 3 additions & 9 deletions crates/wasi-nn/src/backend/onnx.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -437,19 +437,13 @@ fn to_input_value(slot: &TensorSlot) -> Result<[SessionInputValue<'_>; 1], Backe
}

pub fn f32_vec_to_bytes(data: Vec<f32>) -> Vec<u8> {
let chunks: Vec<[u8; 4]> = data.into_iter().map(|f| f.to_le_bytes()).collect();
let result: Vec<u8> = chunks.iter().flatten().copied().collect();
result
data.into_iter().flat_map(f32::to_le_bytes).collect()
}

pub fn bytes_to_f32_vec(data: Vec<u8>) -> Vec<f32> {
let chunks: Vec<&[u8]> = data.chunks(4).collect();
let v: Vec<f32> = chunks
.into_iter()
data.chunks(4)
.map(|c| f32::from_le_bytes(c.try_into().unwrap()))
.collect();

v.into_iter().collect()
.collect()
}

/// Returns whether the dimension is dynamic.
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