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issue #68 - added support for prefetch in MSVC

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greg
2020-10-02 14:35:08 -04:00
parent c4121f9ef5
commit 1120316af3
1 changed files with 6 additions and 4 deletions
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parallel_hashmap/phmap.h
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+6 -4
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@@ -1600,7 +1600,11 @@ public:
// specific benchmarks indicating its importance.
void prefetch_hash(size_t hash) const {
(void)hash;
#if defined(__GNUC__)
#if defined(_MSC_VER)
auto seq = probe(hash);
_mm_prefetch((const char *)(ctrl_ + seq.offset()), _MM_HINT_NTA);
_mm_prefetch((const char *)(slots_ + seq.offset()), _MM_HINT_NTA);
#elif defined(__GNUC__)
auto seq = probe(hash);
__builtin_prefetch(static_cast<const void*>(ctrl_ + seq.offset()));
__builtin_prefetch(static_cast<const void*>(slots_ + seq.offset()));
@@ -3070,13 +3074,11 @@ public:
template <class K = key_type>
void prefetch(const key_arg<K>& key) const {
(void)key;
#if 0 && defined(__GNUC__)
size_t hashval = HashElement{hash_ref()}(key);
const Inner& inner = sets_[subidx(hashval)];
const auto& set = inner.set_;
typename Lockable::UniqueLock m(inner);
typename Lockable::SharedLock m(const_cast<Inner&>(inner));
set.prefetch_hash(hashval);
#endif // __GNUC__
}
// The API of find() has two extensions.