diff options
Diffstat (limited to 'src/ringct')
| -rw-r--r-- | src/ringct/multiexp.cc | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/src/ringct/multiexp.cc b/src/ringct/multiexp.cc index 21957b94c..fb2f18551 100644 --- a/src/ringct/multiexp.cc +++ b/src/ringct/multiexp.cc @@ -320,7 +320,7 @@ rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> data) return res; } -static constexpr unsigned int STRAUS_C = 4; +#define STRAUS_C 4 struct straus_cached_data { @@ -447,26 +447,23 @@ rct::key straus(const std::vector<MultiexpData> &data, const std::shared_ptr<str #endif MULTIEXP_PERF(PERF_TIMER_START_UNIT(digits, 1000000)); +#if STRAUS_C==4 + std::unique_ptr<uint8_t[]> digits{new uint8_t[64 * data.size()]}; +#else std::unique_ptr<uint8_t[]> digits{new uint8_t[256 * data.size()]}; +#endif for (size_t j = 0; j < data.size(); ++j) { unsigned char bytes33[33]; memcpy(bytes33, data[j].scalar.bytes, 32); bytes33[32] = 0; const unsigned char *bytes = bytes33; -#if 1 - static_assert(STRAUS_C == 4, "optimized version needs STRAUS_C == 4"); +#if STRAUS_C==4 unsigned int i; - for (i = 0; i < 256; i += 8, bytes++) + for (i = 0; i < 64; i += 2, bytes++) { - digits[j*256+i] = bytes[0] & 0xf; - digits[j*256+i+1] = (bytes[0] >> 1) & 0xf; - digits[j*256+i+2] = (bytes[0] >> 2) & 0xf; - digits[j*256+i+3] = (bytes[0] >> 3) & 0xf; - digits[j*256+i+4] = ((bytes[0] >> 4) | (bytes[1]<<4)) & 0xf; - digits[j*256+i+5] = ((bytes[0] >> 5) | (bytes[1]<<3)) & 0xf; - digits[j*256+i+6] = ((bytes[0] >> 6) | (bytes[1]<<2)) & 0xf; - digits[j*256+i+7] = ((bytes[0] >> 7) | (bytes[1]<<1)) & 0xf; + digits[j*64+i] = bytes[0] & 0xf; + digits[j*64+i+1] = bytes[0] >> 4; } #elif 1 for (size_t i = 0; i < 256; ++i) @@ -521,7 +518,11 @@ skipfirst: if (skip[j]) continue; #endif +#if STRAUS_C==4 + const uint8_t digit = digits[j*64+i/4]; +#else const uint8_t digit = digits[j*256+i]; +#endif if (digit) { ge_add(&p1, &band_p3, &CACHE_OFFSET(local_cache, j, digit)); |