Function rotl

3rd/mimalloc-2.0.9/src/random.c:40–42

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static inline uint32_t rotl(uint32_t x, uint32_t shift) {
  return (x << shift) | (x >> (32 - shift));
}

static inline void qround(uint32_t x[16], size_t a, size_t b, size_t c, size_t d) {
  x[a] += x[b]; x[d] = rotl(x[d] ^ x[a], 16);