/*
- * Copyright (c) 2008, 2009, 2010, 2012, 2013 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2012, 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
{
return hash_words64_inline(p, n_words, basis);
}
+
+#if !(defined(__x86_64__))
+void
+hash_bytes128(const void *p_, size_t len, uint32_t basis, ovs_u128 *out)
+{
+ const uint32_t c1 = 0x239b961b;
+ const uint32_t c2 = 0xab0e9789;
+ const uint32_t c3 = 0x38b34ae5;
+ const uint32_t c4 = 0xa1e38b93;
+ const uint8_t *tail, *data = (const uint8_t *)p_;
+ const uint32_t *blocks = (const uint32_t *)p_;
+ const int nblocks = len / 16;
+ uint32_t h1 = basis;
+ uint32_t h2 = basis;
+ uint32_t h3 = basis;
+ uint32_t h4 = basis;
+ uint32_t k1, k2, k3, k4;
+
+ /* Body */
+ for (int i = 0; i < nblocks; i++) {
+ uint32_t k1 = get_unaligned_u32(&blocks[i * 4 + 0]);
+ uint32_t k2 = get_unaligned_u32(&blocks[i * 4 + 1]);
+ uint32_t k3 = get_unaligned_u32(&blocks[i * 4 + 2]);
+ uint32_t k4 = get_unaligned_u32(&blocks[i * 4 + 3]);
+
+ k1 *= c1;
+ k1 = hash_rot(k1, 15);
+ k1 *= c2;
+ h1 ^= k1;
+
+ h1 = hash_rot(h1, 19);
+ h1 += h2;
+ h1 = h1 * 5 + 0x561ccd1b;
+
+ k2 *= c2;
+ k2 = hash_rot(k2, 16);
+ k2 *= c3;
+ h2 ^= k2;
+
+ h2 = hash_rot(h2, 17);
+ h2 += h3;
+ h2 = h2 * 5 + 0x0bcaa747;
+
+ k3 *= c3;
+ k3 = hash_rot(k3, 17);
+ k3 *= c4;
+ h3 ^= k3;
+
+ h3 = hash_rot(h3, 15);
+ h3 += h4;
+ h3 = h3 * 5 + 0x96cd1c35;
+
+ k4 *= c4;
+ k4 = hash_rot(k4, 18);
+ k4 *= c1;
+ h4 ^= k4;
+
+ h4 = hash_rot(h4, 13);
+ h4 += h1;
+ h4 = h4 * 5 + 0x32ac3b17;
+ }
+
+ /* Tail */
+ k1 = k2 = k3 = k4 = 0;
+ tail = data + nblocks * 16;
+ switch (len & 15) {
+ case 15:
+ k4 ^= tail[14] << 16;
+ case 14:
+ k4 ^= tail[13] << 8;
+ case 13:
+ k4 ^= tail[12] << 0;
+ k4 *= c4;
+ k4 = hash_rot(k4, 18);
+ k4 *= c1;
+ h4 ^= k4;
+
+ case 12:
+ k3 ^= tail[11] << 24;
+ case 11:
+ k3 ^= tail[10] << 16;
+ case 10:
+ k3 ^= tail[9] << 8;
+ case 9:
+ k3 ^= tail[8] << 0;
+ k3 *= c3;
+ k3 = hash_rot(k3, 17);
+ k3 *= c4;
+ h3 ^= k3;
+
+ case 8:
+ k2 ^= tail[7] << 24;
+ case 7:
+ k2 ^= tail[6] << 16;
+ case 6:
+ k2 ^= tail[5] << 8;
+ case 5:
+ k2 ^= tail[4] << 0;
+ k2 *= c2;
+ k2 = hash_rot(k2, 16);
+ k2 *= c3;
+ h2 ^= k2;
+
+ case 4:
+ k1 ^= tail[3] << 24;
+ case 3:
+ k1 ^= tail[2] << 16;
+ case 2:
+ k1 ^= tail[1] << 8;
+ case 1:
+ k1 ^= tail[0] << 0;
+ k1 *= c1;
+ k1 = hash_rot(k1, 15);
+ k1 *= c2;
+ h1 ^= k1;
+ };
+
+ /* Finalization */
+ h1 ^= len;
+ h2 ^= len;
+ h3 ^= len;
+ h4 ^= len;
+
+ h1 += h2;
+ h1 += h3;
+ h1 += h4;
+ h2 += h1;
+ h3 += h1;
+ h4 += h1;
+
+ h1 = mhash_finish(h1);
+ h2 = mhash_finish(h2);
+ h3 = mhash_finish(h3);
+ h4 = mhash_finish(h4);
+
+ h1 += h2;
+ h1 += h3;
+ h1 += h4;
+ h2 += h1;
+ h3 += h1;
+ h4 += h1;
+
+ out->u32[0] = h1;
+ out->u32[1] = h2;
+ out->u32[2] = h3;
+ out->u32[3] = h4;
+}
+
+#else /* __x86_64__ */
+
+static inline uint64_t
+hash_rot64(uint64_t x, int8_t r)
+{
+ return (x << r) | (x >> (64 - r));
+}
+
+static inline uint64_t
+fmix64(uint64_t k)
+{
+ k ^= k >> 33;
+ k *= 0xff51afd7ed558ccdULL;
+ k ^= k >> 33;
+ k *= 0xc4ceb9fe1a85ec53ULL;
+ k ^= k >> 33;
+
+ return k;
+}
+
+void
+hash_bytes128(const void *p_, size_t len, uint32_t basis, ovs_u128 *out)
+{
+ const uint64_t c1 = 0x87c37b91114253d5ULL;
+ const uint64_t c2 = 0x4cf5ad432745937fULL;
+ const uint8_t *tail, *data = (const uint8_t *)p_;
+ const uint64_t *blocks = (const uint64_t *)p_;
+ const int nblocks = len / 16;
+ uint64_t h1 = basis;
+ uint64_t h2 = basis;
+ uint64_t k1, k2;
+
+ /* Body */
+ for (int i = 0; i < nblocks; i++) {
+ k1 = get_unaligned_u64(&blocks[i * 2 + 0]);
+ k2 = get_unaligned_u64(&blocks[i * 2 + 1]);
+
+ k1 *= c1;
+ k1 = hash_rot64(k1, 31);
+ k1 *= c2;
+ h1 ^= k1;
+
+ h1 = hash_rot64(h1, 27);
+ h1 += h2;
+ h1 = h1 * 5 + 0x52dce729;
+
+ k2 *= c2;
+ k2 = hash_rot64(k2, 33);
+ k2 *= c1;
+ h2 ^= k2;
+
+ h2 = hash_rot64(h2, 31);
+ h2 += h1;
+ h2 = h2 * 5 + 0x38495ab5;
+ }
+
+ /* Tail */
+ k1 = 0;
+ k2 = 0;
+ tail = data + nblocks * 16;
+ switch (len & 15) {
+ case 15:
+ k2 ^= ((uint64_t) tail[14]) << 48;
+ case 14:
+ k2 ^= ((uint64_t) tail[13]) << 40;
+ case 13:
+ k2 ^= ((uint64_t) tail[12]) << 32;
+ case 12:
+ k2 ^= ((uint64_t) tail[11]) << 24;
+ case 11:
+ k2 ^= ((uint64_t) tail[10]) << 16;
+ case 10:
+ k2 ^= ((uint64_t) tail[9]) << 8;
+ case 9:
+ k2 ^= ((uint64_t) tail[8]) << 0;
+ k2 *= c2;
+ k2 = hash_rot64(k2, 33);
+ k2 *= c1;
+ h2 ^= k2;
+
+ case 8:
+ k1 ^= ((uint64_t) tail[7]) << 56;
+ case 7:
+ k1 ^= ((uint64_t) tail[6]) << 48;
+ case 6:
+ k1 ^= ((uint64_t) tail[5]) << 40;
+ case 5:
+ k1 ^= ((uint64_t) tail[4]) << 32;
+ case 4:
+ k1 ^= ((uint64_t) tail[3]) << 24;
+ case 3:
+ k1 ^= ((uint64_t) tail[2]) << 16;
+ case 2:
+ k1 ^= ((uint64_t) tail[1]) << 8;
+ case 1:
+ k1 ^= ((uint64_t) tail[0]) << 0;
+ k1 *= c1;
+ k1 = hash_rot64(k1, 31);
+ k1 *= c2;
+ h1 ^= k1;
+ };
+
+ /* Finalization */
+ h1 ^= len;
+ h2 ^= len;
+ h1 += h2;
+ h2 += h1;
+ h1 = fmix64(h1);
+ h2 = fmix64(h2);
+ h1 += h2;
+ h2 += h1;
+
+ out->u64.lo = h1;
+ out->u64.hi = h2;
+}
+#endif /* __x86_64__ */
projects / cascardo / ovs.git / blobdiff