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Rotate by scalar shift counts in in_out_mapper_simd #4

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Merged
RagnarGrootKoerkamp merged 1 commit into from
Oct 23, 2026
Merged

Rotate by scalar shift counts in in_out_mapper_simd #4

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6 changes: 2 additions & 4 deletions src/nthash.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -349,14 +349,12 @@ impl<CH: CharHasher> KmerHasher for CH {
assert!(seq.bits_per_char() <= CH::BITS_PER_CHAR);
let mut fw = S::splat(self.fw_init());
let mut rc = S::splat(self.rc_init());
let shl = S::splat(CH::R);
let shr = S::splat(32 - CH::R);

move |(a, r)| {
let fw_out = ((fw << shl) | (fw >> shr)) ^ self.simd_f(a);
let fw_out = ((fw << CH::R) | (fw >> (32 - CH::R))) ^ self.simd_f(a);
fw = fw_out ^ self.simd_f_rot(r);
if Self::CANONICAL {
let rc_out = ((rc >> shl) | (rc << shr)) ^ self.simd_c_rot(a);
let rc_out = ((rc >> CH::R) | (rc << (32 - CH::R))) ^ self.simd_c_rot(a);
rc = rc_out ^ self.simd_c(r);
// Wrapping SIMD add
fw_out + rc_out
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