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multiexp: tune which variants to use for which number of points
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8b4767221c
commit
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2 changed files with 30 additions and 14 deletions
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@ -48,7 +48,7 @@ extern "C"
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#define PERF_TIMER_START_BP(x) PERF_TIMER_START_UNIT(x, 1000000)
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#define PERF_TIMER_START_BP(x) PERF_TIMER_START_UNIT(x, 1000000)
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#define STRAUS_SIZE_LIMIT 128
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#define STRAUS_SIZE_LIMIT 232
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#define PIPPENGER_SIZE_LIMIT 0
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#define PIPPENGER_SIZE_LIMIT 0
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namespace rct
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namespace rct
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@ -77,11 +77,11 @@ static inline rct::key multiexp(const std::vector<MultiexpData> &data, size_t Hi
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{
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{
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if (HiGi_size > 0)
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if (HiGi_size > 0)
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{
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{
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static_assert(128 <= STRAUS_SIZE_LIMIT, "Straus in precalc mode can only be calculated till STRAUS_SIZE_LIMIT");
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static_assert(232 <= STRAUS_SIZE_LIMIT, "Straus in precalc mode can only be calculated till STRAUS_SIZE_LIMIT");
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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()));
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return HiGi_size <= 232 && data.size() == HiGi_size ? straus(data, straus_HiGi_cache, 0) : pippenger(data, pippenger_HiGi_cache, HiGi_size, get_pippenger_c(data.size()));
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}
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}
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else
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else
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return data.size() <= 64 ? straus(data, NULL, 0) : pippenger(data, NULL, 0, get_pippenger_c(data.size()));
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return data.size() <= 95 ? straus(data, NULL, 0) : pippenger(data, NULL, 0, get_pippenger_c(data.size()));
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}
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}
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static inline bool is_reduced(const rct::key &scalar)
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static inline bool is_reduced(const rct::key &scalar)
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@ -79,6 +79,25 @@ extern "C"
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// Best/cached Straus Straus Straus Straus Straus Straus Straus Straus Pip Pip Pip Pip
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// Best/cached Straus Straus Straus Straus Straus Straus Straus Straus Pip Pip Pip Pip
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// Best/uncached Straus Straus Straus Straus Straus Straus Pip Pip Pip Pip Pip Pip
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// Best/uncached Straus Straus Straus Straus Straus Straus Pip Pip Pip Pip Pip Pip
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// New timings:
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// Pippenger:
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// 2/1 always
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// 3/2 at ~13
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// 4/3 at ~29
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// 5/4 at ~83
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// 6/5 < 200
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// 7/6 at ~470
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// 8/7 at ~1180
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// 9/8 at ~2290
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// Cached Pippenger:
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// 6/5 < 200
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// 7/6 at 460
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// 8/7 at 1180
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// 9/8 at 2300
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//
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// Cached Straus/Pippenger cross at 232
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//
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namespace rct
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namespace rct
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{
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{
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@ -543,16 +562,13 @@ skipfirst:
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size_t get_pippenger_c(size_t N)
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size_t get_pippenger_c(size_t N)
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{
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{
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// uncached: 2:1, 4:2, 8:2, 16:3, 32:4, 64:4, 128:5, 256:6, 512:7, 1024:7, 2048:8, 4096:9
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if (N <= 13) return 2;
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// cached: 2:1, 4:2, 8:2, 16:3, 32:4, 64:4, 128:5, 256:6, 512:7, 1024:7, 2048:8, 4096:9
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if (N <= 29) return 3;
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if (N <= 2) return 1;
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if (N <= 83) return 4;
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if (N <= 8) return 2;
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if (N <= 185) return 5;
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if (N <= 16) return 3;
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if (N <= 465) return 6;
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if (N <= 64) return 4;
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if (N <= 1180) return 7;
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if (N <= 128) return 5;
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if (N <= 2295) return 8;
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if (N <= 256) return 6;
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if (N <= 1024) return 7;
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if (N <= 2048) return 8;
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return 9;
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return 9;
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}
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}
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