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multiexp: handle pippenger multiexps with part precalc

This commit is contained in:
moneromooo-monero 2018-08-24 21:20:56 +00:00
parent 10e5a92769
commit 6f9ae5b6eb
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GPG Key ID: 686F07454D6CEFC3
4 changed files with 29 additions and 21 deletions
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21
src/ringct/bulletproofs.cc
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@ -73,15 +73,15 @@ static const rct::keyV twoN = vector_powers(TWO, maxN);
static const rct::key ip12 = inner_product(oneN, twoN);
static boost::mutex init_mutex;
static inline rct::key multiexp(const std::vector<MultiexpData> &data, bool HiGi)
static inline rct::key multiexp(const std::vector<MultiexpData> &data, size_t HiGi_size)
{
if (HiGi)
if (HiGi_size > 0)
{
static_assert(128 <= STRAUS_SIZE_LIMIT, "Straus in precalc mode can only be calculated till STRAUS_SIZE_LIMIT");
return data.size() <= 128 ? straus(data, straus_HiGi_cache, 0) : pippenger(data, pippenger_HiGi_cache, get_pippenger_c(data.size()));
return HiGi_size <= 128 && data.size() == HiGi_size ? straus(data, straus_HiGi_cache, 0) : pippenger(data, pippenger_HiGi_cache, HiGi_size, get_pippenger_c(data.size()));
}
else
return data.size() <= 64 ? straus(data, NULL, 0) : pippenger(data, NULL, get_pippenger_c(data.size()));
return data.size() <= 64 ? straus(data, NULL, 0) : pippenger(data, NULL, 0, get_pippenger_c(data.size()));
}
static inline bool is_reduced(const rct::key &scalar)
@ -118,7 +118,7 @@ static void init_exponents()
}
straus_HiGi_cache = straus_init_cache(data, STRAUS_SIZE_LIMIT);
pippenger_HiGi_cache = pippenger_init_cache(data, PIPPENGER_SIZE_LIMIT);
pippenger_HiGi_cache = pippenger_init_cache(data, 0, PIPPENGER_SIZE_LIMIT);
MINFO("Hi/Gi cache size: " << (sizeof(Hi)+sizeof(Gi))/1024 << " kB");
MINFO("Hi_p3/Gi_p3 cache size: " << (sizeof(Hi_p3)+sizeof(Gi_p3))/1024 << " kB");
@ -142,7 +142,7 @@ static rct::key vector_exponent(const rct::keyV &a, const rct::keyV &b)
multiexp_data.emplace_back(a[i], Gi_p3[i]);
multiexp_data.emplace_back(b[i], Hi_p3[i]);
}
return multiexp(multiexp_data, true);
return multiexp(multiexp_data, 2 * a.size());
}
/* Compute a custom vector-scalar commitment */
@ -169,7 +169,7 @@ static rct::key cross_vector_exponent8(size_t size, const std::vector<ge_p3> &A,
sc_mul(multiexp_data.back().scalar.bytes, extra_scalar->bytes, INV_EIGHT.bytes);
multiexp_data.back().point = *extra_point;
}
return multiexp(multiexp_data, false);
return multiexp(multiexp_data, 0);
}
/* Given a scalar, construct a vector of powers */
@ -839,6 +839,7 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
std::vector<MultiexpData> multiexp_data;
multiexp_data.reserve(nV + (2 * (10/*logM*/ + logN) + 4) * proofs.size() + 2 * maxMN);
multiexp_data.resize(2 * maxMN);
PERF_TIMER_START_BP(VERIFY_line_24_25_invert);
const std::vector<rct::key> inverses = invert(to_invert);
@ -1011,10 +1012,10 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
multiexp_data.emplace_back(tmp, rct::H);
for (size_t i = 0; i < maxMN; ++i)
{
multiexp_data.emplace_back(m_z4[i], Gi_p3[i]);
multiexp_data.emplace_back(m_z5[i], Hi_p3[i]);
multiexp_data[i * 2] = {m_z4[i], Gi_p3[i]};
multiexp_data[i * 2 + 1] = {m_z5[i], Hi_p3[i]};
}
if (!(multiexp(multiexp_data, false) == rct::identity()))
if (!(multiexp(multiexp_data, 2 * maxMN) == rct::identity()))
{
PERF_TIMER_STOP(VERIFY_step2_check);
MERROR("Verification failure");

21
src/ringct/multiexp.cc
View File

@ -564,12 +564,13 @@ struct pippenger_cached_data
~pippenger_cached_data() { aligned_free(cached); }
};
std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<MultiexpData> &data, size_t N)
std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<MultiexpData> &data, size_t start_offset, size_t N)
{
MULTIEXP_PERF(PERF_TIMER_START_UNIT(pippenger_init_cache, 1000000));
CHECK_AND_ASSERT_THROW_MES(start_offset <= data.size(), "Bad cache base data");
if (N == 0)
N = data.size();
CHECK_AND_ASSERT_THROW_MES(N <= data.size(), "Bad cache base data");
N = data.size() - start_offset;
CHECK_AND_ASSERT_THROW_MES(N <= data.size() - start_offset, "Bad cache base data");
ge_cached cached;
std::shared_ptr<pippenger_cached_data> cache(new pippenger_cached_data());
@ -577,7 +578,7 @@ std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<Mu
cache->cached = (ge_cached*)aligned_realloc(cache->cached, N * sizeof(ge_cached), 4096);
CHECK_AND_ASSERT_THROW_MES(cache->cached, "Out of memory");
for (size_t i = 0; i < N; ++i)
ge_p3_to_cached(&cache->cached[i], &data[i].point);
ge_p3_to_cached(&cache->cached[i], &data[i+start_offset].point);
MULTIEXP_PERF(PERF_TIMER_STOP(pippenger_init_cache));
return cache;
@ -588,9 +589,11 @@ size_t pippenger_get_cache_size(const std::shared_ptr<pippenger_cached_data> &ca
return cache->size * sizeof(*cache->cached);
}
rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<pippenger_cached_data> &cache, size_t c)
rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<pippenger_cached_data> &cache, size_t cache_size, size_t c)
{
CHECK_AND_ASSERT_THROW_MES(cache == NULL || cache->size >= data.size(), "Cache is too small");
if (cache != NULL && cache_size == 0)
cache_size = cache->size;
CHECK_AND_ASSERT_THROW_MES(cache == NULL || cache_size <= cache->size, "Cache is too small");
if (c == 0)
c = get_pippenger_c(data.size());
CHECK_AND_ASSERT_THROW_MES(c <= 9, "c is too large");
@ -598,6 +601,7 @@ rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<
ge_p3 result = ge_p3_identity;
std::unique_ptr<ge_p3[]> buckets{new ge_p3[1<<c]};
std::shared_ptr<pippenger_cached_data> local_cache = cache == NULL ? pippenger_init_cache(data) : cache;
std::shared_ptr<pippenger_cached_data> local_cache_2 = data.size() > cache_size ? pippenger_init_cache(data, cache_size) : NULL;
rct::key maxscalar = rct::zero();
for (size_t i = 0; i < data.size(); ++i)
@ -641,7 +645,10 @@ rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<
CHECK_AND_ASSERT_THROW_MES(bucket < (1u<<c), "bucket overflow");
if (!ge_p3_is_point_at_infinity(&buckets[bucket]))
{
add(buckets[bucket], local_cache->cached[i]);
if (i < cache_size)
add(buckets[bucket], local_cache->cached[i]);
else
add(buckets[bucket], local_cache_2->cached[i - cache_size]);
}
else
buckets[bucket] = data[i].point;

4
src/ringct/multiexp.h
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@ -61,10 +61,10 @@ rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> data);
std::shared_ptr<straus_cached_data> straus_init_cache(const std::vector<MultiexpData> &data, size_t N =0);
size_t straus_get_cache_size(const std::shared_ptr<straus_cached_data> &cache);
rct::key straus(const std::vector<MultiexpData> &data, const std::shared_ptr<straus_cached_data> &cache = NULL, size_t STEP = 0);
std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<MultiexpData> &data, size_t N =0);
std::shared_ptr<pippenger_cached_data> pippenger_init_cache(const std::vector<MultiexpData> &data, size_t start_offset = 0, size_t N =0);
size_t pippenger_get_cache_size(const std::shared_ptr<pippenger_cached_data> &cache);
size_t get_pippenger_c(size_t N);
rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<pippenger_cached_data> &cache = NULL, size_t c = 0);
rct::key pippenger(const std::vector<MultiexpData> &data, const std::shared_ptr<pippenger_cached_data> &cache = NULL, size_t cache_size = 0, size_t c = 0);
}

4
tests/performance_tests/multiexp.h
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@ -78,9 +78,9 @@ public:
case multiexp_straus_cached:
return res == straus(data, straus_cache);
case multiexp_pippenger:
return res == pippenger(data, NULL, c);
return res == pippenger(data, NULL, 0, c);
case multiexp_pippenger_cached:
return res == pippenger(data, pippenger_cache, c);
return res == pippenger(data, pippenger_cache, 0, c);
default:
return false;
}