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Speed up hash chain initialization using memset.

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That gains 1% on lossy compression.

Change-Id: Ib9aa210194ed2f17eaff85b499b55cc4eb99ff11
This commit is contained in:
Vincent Rabaud 2015-12-07 11:54:50 +01:00
parent 4c60f63c64
commit 6c702b81ac
1 changed files with 4 additions and 7 deletions
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11
src/enc/backward_references.c
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@ -196,14 +196,11 @@ int VP8LBackwardRefsCopy(const VP8LBackwardRefs* const src,
// initialize as empty // initialize as empty
static void HashChainReset(VP8LHashChain* const p) { static void HashChainReset(VP8LHashChain* const p) {
int i;
assert(p != NULL); assert(p != NULL);
for (i = 0; i < p->size_; ++i) { // Set the int32_t arrays to -1.
p->chain_[i] = -1; memset(p->chain_, 0xff, p->size_ * sizeof(*p->chain_));
} memset(p->hash_to_first_index_, 0xff,
for (i = 0; i < HASH_SIZE; ++i) { HASH_SIZE * sizeof(*p->hash_to_first_index_));
p->hash_to_first_index_[i] = -1;
}
} }
int VP8LHashChainInit(VP8LHashChain* const p, int size) { int VP8LHashChainInit(VP8LHashChain* const p, int size) {