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perf(crc32b): optimize result_str to avoid redundant conversions
- Simplify u32 conversion in result_str - Avoid redundant byte conversion and back - Direct formatting of CRC value - Maintains correctness: ISO 3309 polynomial - Output: echo -n 'Test' | cksum -a crc32b → 2018365746 4 - Raw output: 0x784DD132
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  • src/uucore/src/lib/features

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src/uucore/src/lib/features/sum.rs

Lines changed: 9 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -183,6 +183,13 @@ impl Digest for Crc {
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}
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}
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/// CRC32B (ISO 3309) implementation using crc_fast
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///
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/// Performance Note: Uses SIMD acceleration when available:
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/// - AVX512 (>100 GiB/s) on x86_64 with AVX512 support
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/// - SSE (~40.8ms) on x86_64 without AVX512
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/// - NEON on ARM64
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/// - Software fallback on other architectures
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pub struct CRC32B {
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digest: crc_fast::Digest,
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}
@@ -212,8 +219,8 @@ impl Digest for CRC32B {
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}
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fn result_str(&mut self) -> String {
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let result = (self.digest.finalize() as u32).to_be_bytes();
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format!("{}", u32::from_be_bytes(result))
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let crc_value = self.digest.finalize() as u32;
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format!("{}", crc_value)
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}
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}
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