// Copyright 2022 gRPC authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include #include #include #include "src/core/ext/transport/chttp2/transport/bin_encoder.h" #include "src/core/ext/transport/chttp2/transport/decode_huff.h" #include "src/core/lib/slice/slice.h" #include "test/core/util/test_config.h" static const std::vector* kInput = [] { std::vector v; std::mt19937 rd(0); std::uniform_int_distribution<> dist_ty(0, 100); std::uniform_int_distribution<> dist_byte(0, 255); std::uniform_int_distribution<> dist_normal(32, 126); for (int i = 0; i < 1024 * 1024; i++) { if (dist_ty(rd) == 1) { v.push_back(dist_byte(rd)); } else { v.push_back(dist_normal(rd)); } } grpc_core::Slice s = grpc_core::Slice::FromCopiedBuffer(v); grpc_core::Slice c(grpc_chttp2_huffman_compress(s.c_slice())); return new std::vector(c.begin(), c.end()); }(); static void BM_Decode(benchmark::State& state) { std::vector output; auto add = [&output](uint8_t c) { output.push_back(c); }; for (auto _ : state) { output.clear(); grpc_core::HuffDecoder(add, kInput->data(), kInput->data() + kInput->size()) .Run(); } } BENCHMARK(BM_Decode); // Legacy huffman decoder static void BM_LegacyDecode(benchmark::State& state) { // state table for huffman decoding: given a state, gives an index/16 into // next_sub_tbl. Taking that index and adding the value of the nibble being // considered returns the next state. // generated by gen_hpack_tables.c static const uint8_t next_tbl[256] = { 0, 1, 2, 3, 4, 1, 2, 5, 6, 1, 7, 8, 1, 3, 3, 9, 10, 11, 1, 1, 1, 12, 1, 2, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 14, 1, 15, 16, 1, 17, 1, 15, 2, 7, 3, 18, 19, 1, 1, 1, 1, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 15, 2, 2, 7, 21, 1, 22, 1, 1, 1, 1, 1, 1, 1, 1, 15, 2, 2, 2, 2, 2, 2, 23, 24, 25, 1, 1, 1, 1, 2, 2, 2, 26, 3, 3, 27, 10, 28, 1, 1, 1, 1, 1, 1, 2, 3, 29, 10, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 31, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 32, 1, 1, 15, 33, 1, 34, 35, 9, 36, 1, 1, 1, 1, 1, 1, 1, 37, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 26, 9, 38, 1, 1, 1, 1, 1, 1, 1, 15, 2, 2, 2, 2, 26, 3, 3, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 7, 3, 3, 3, 40, 2, 41, 1, 1, 1, 42, 43, 1, 1, 44, 1, 1, 1, 1, 15, 2, 2, 2, 2, 2, 2, 3, 3, 3, 45, 46, 1, 1, 2, 2, 2, 35, 3, 3, 18, 47, 2, }; // next state, based upon current state and the current nibble: see above. // generated by gen_hpack_tables.c static const int16_t next_sub_tbl[48 * 16] = { 1, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 2, 6, 10, 13, 14, 15, 16, 17, 2, 6, 10, 13, 14, 15, 16, 17, 3, 7, 11, 24, 3, 7, 11, 24, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 199, 200, 201, 202, 203, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 132, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 19, 20, 21, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 22, 23, 91, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 3, 7, 11, 24, 3, 7, 11, 24, 0, 0, 0, 0, 0, 41, 42, 43, 2, 6, 10, 13, 14, 15, 16, 17, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 44, 45, 2, 6, 10, 13, 14, 15, 16, 17, 46, 47, 48, 49, 50, 51, 52, 57, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 74, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 73, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 3, 7, 11, 24, 3, 7, 11, 24, 3, 7, 11, 24, 0, 0, 0, 0, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 0, 0, 0, 92, 0, 0, 0, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 2, 6, 10, 13, 14, 15, 16, 17, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 148, 149, 150, 151, 3, 7, 11, 24, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 152, 153, 3, 7, 11, 24, 3, 7, 11, 24, 3, 7, 11, 24, 154, 155, 156, 164, 3, 7, 11, 24, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 157, 158, 159, 160, 161, 162, 163, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 197, 198, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 219, 220, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 0, 0, 221, 222, 223, 224, 3, 7, 11, 24, 3, 7, 11, 24, 4, 8, 4, 8, 4, 8, 225, 228, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 226, 227, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, }; // emission table: indexed like next_tbl, ultimately gives the byte to be // emitted, or -1 for no byte, or 256 for end of stream // generated by gen_hpack_tables.c static const uint16_t emit_tbl[256] = { 0, 1, 2, 3, 4, 5, 6, 7, 0, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 0, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 0, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 0, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 0, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 0, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 0, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, }; // generated by gen_hpack_tables.c static const int16_t emit_sub_tbl[249 * 16] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 48, 48, 48, 48, 48, 48, 48, 48, 49, 49, 49, 49, 49, 49, 49, 49, 48, 48, 48, 48, 49, 49, 49, 49, 50, 50, 50, 50, 97, 97, 97, 97, 48, 48, 49, 49, 50, 50, 97, 97, 99, 99, 101, 101, 105, 105, 111, 111, 48, 49, 50, 97, 99, 101, 105, 111, 115, 116, -1, -1, -1, -1, -1, -1, 32, 32, 32, 32, 32, 32, 32, 32, 37, 37, 37, 37, 37, 37, 37, 37, 99, 99, 99, 99, 101, 101, 101, 101, 105, 105, 105, 105, 111, 111, 111, 111, 115, 115, 116, 116, 32, 37, 45, 46, 47, 51, 52, 53, 54, 55, 56, 57, 61, 61, 61, 61, 61, 61, 61, 61, 65, 65, 65, 65, 65, 65, 65, 65, 115, 115, 115, 115, 116, 116, 116, 116, 32, 32, 37, 37, 45, 45, 46, 46, 61, 65, 95, 98, 100, 102, 103, 104, 108, 109, 110, 112, 114, 117, -1, -1, 58, 58, 58, 58, 58, 58, 58, 58, 66, 66, 66, 66, 66, 66, 66, 66, 47, 47, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55, 56, 56, 57, 57, 61, 61, 65, 65, 95, 95, 98, 98, 100, 100, 102, 102, 103, 103, 104, 104, 108, 108, 109, 109, 110, 110, 112, 112, 114, 114, 117, 117, 58, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 89, 106, 107, 113, 118, 119, 120, 121, 122, -1, -1, -1, -1, 38, 38, 38, 38, 38, 38, 38, 38, 42, 42, 42, 42, 42, 42, 42, 42, 44, 44, 44, 44, 44, 44, 44, 44, 59, 59, 59, 59, 59, 59, 59, 59, 88, 88, 88, 88, 88, 88, 88, 88, 90, 90, 90, 90, 90, 90, 90, 90, 33, 33, 34, 34, 40, 40, 41, 41, 63, 63, 39, 43, 124, -1, -1, -1, 35, 35, 35, 35, 35, 35, 35, 35, 62, 62, 62, 62, 62, 62, 62, 62, 0, 0, 0, 0, 36, 36, 36, 36, 64, 64, 64, 64, 91, 91, 91, 91, 69, 69, 69, 69, 69, 69, 69, 69, 70, 70, 70, 70, 70, 70, 70, 70, 71, 71, 71, 71, 71, 71, 71, 71, 72, 72, 72, 72, 72, 72, 72, 72, 73, 73, 73, 73, 73, 73, 73, 73, 74, 74, 74, 74, 74, 74, 74, 74, 75, 75, 75, 75, 75, 75, 75, 75, 76, 76, 76, 76, 76, 76, 76, 76, 77, 77, 77, 77, 77, 77, 77, 77, 78, 78, 78, 78, 78, 78, 78, 78, 79, 79, 79, 79, 79, 79, 79, 79, 80, 80, 80, 80, 80, 80, 80, 80, 81, 81, 81, 81, 81, 81, 81, 81, 82, 82, 82, 82, 82, 82, 82, 82, 83, 83, 83, 83, 83, 83, 83, 83, 84, 84, 84, 84, 84, 84, 84, 84, 85, 85, 85, 85, 85, 85, 85, 85, 86, 86, 86, 86, 86, 86, 86, 86, 87, 87, 87, 87, 87, 87, 87, 87, 89, 89, 89, 89, 89, 89, 89, 89, 106, 106, 106, 106, 106, 106, 106, 106, 107, 107, 107, 107, 107, 107, 107, 107, 113, 113, 113, 113, 113, 113, 113, 113, 118, 118, 118, 118, 118, 118, 118, 118, 119, 119, 119, 119, 119, 119, 119, 119, 120, 120, 120, 120, 120, 120, 120, 120, 121, 121, 121, 121, 121, 121, 121, 121, 122, 122, 122, 122, 122, 122, 122, 122, 38, 38, 38, 38, 42, 42, 42, 42, 44, 44, 44, 44, 59, 59, 59, 59, 88, 88, 88, 88, 90, 90, 90, 90, 33, 34, 40, 41, 63, -1, -1, -1, 39, 39, 39, 39, 39, 39, 39, 39, 43, 43, 43, 43, 43, 43, 43, 43, 124, 124, 124, 124, 124, 124, 124, 124, 35, 35, 35, 35, 62, 62, 62, 62, 0, 0, 36, 36, 64, 64, 91, 91, 93, 93, 126, 126, 94, 125, -1, -1, 60, 60, 60, 60, 60, 60, 60, 60, 96, 96, 96, 96, 96, 96, 96, 96, 123, 123, 123, 123, 123, 123, 123, 123, -1, -1, -1, -1, -1, -1, -1, -1, 92, 92, 92, 92, 92, 92, 92, 92, 195, 195, 195, 195, 195, 195, 195, 195, 208, 208, 208, 208, 208, 208, 208, 208, 128, 128, 128, 128, 130, 130, 130, 130, 131, 131, 131, 131, 162, 162, 162, 162, 184, 184, 184, 184, 194, 194, 194, 194, 224, 224, 224, 224, 226, 226, 226, 226, 153, 153, 161, 161, 167, 167, 172, 172, 176, 176, 177, 177, 179, 179, 209, 209, 216, 216, 217, 217, 227, 227, 229, 229, 230, 230, 129, 132, 133, 134, 136, 146, 154, 156, 160, 163, 164, 169, 170, 173, 178, 181, 185, 186, 187, 189, 190, 196, 198, 228, 232, 233, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 135, 135, 135, 135, 135, 135, 135, 135, 137, 137, 137, 137, 137, 137, 137, 137, 138, 138, 138, 138, 138, 138, 138, 138, 139, 139, 139, 139, 139, 139, 139, 139, 140, 140, 140, 140, 140, 140, 140, 140, 141, 141, 141, 141, 141, 141, 141, 141, 143, 143, 143, 143, 143, 143, 143, 143, 147, 147, 147, 147, 147, 147, 147, 147, 149, 149, 149, 149, 149, 149, 149, 149, 150, 150, 150, 150, 150, 150, 150, 150, 151, 151, 151, 151, 151, 151, 151, 151, 152, 152, 152, 152, 152, 152, 152, 152, 155, 155, 155, 155, 155, 155, 155, 155, 157, 157, 157, 157, 157, 157, 157, 157, 158, 158, 158, 158, 158, 158, 158, 158, 165, 165, 165, 165, 165, 165, 165, 165, 166, 166, 166, 166, 166, 166, 166, 166, 168, 168, 168, 168, 168, 168, 168, 168, 174, 174, 174, 174, 174, 174, 174, 174, 175, 175, 175, 175, 175, 175, 175, 175, 180, 180, 180, 180, 180, 180, 180, 180, 182, 182, 182, 182, 182, 182, 182, 182, 183, 183, 183, 183, 183, 183, 183, 183, 188, 188, 188, 188, 188, 188, 188, 188, 191, 191, 191, 191, 191, 191, 191, 191, 197, 197, 197, 197, 197, 197, 197, 197, 231, 231, 231, 231, 231, 231, 231, 231, 239, 239, 239, 239, 239, 239, 239, 239, 9, 9, 9, 9, 142, 142, 142, 142, 144, 144, 144, 144, 145, 145, 145, 145, 148, 148, 148, 148, 159, 159, 159, 159, 171, 171, 171, 171, 206, 206, 206, 206, 215, 215, 215, 215, 225, 225, 225, 225, 236, 236, 236, 236, 237, 237, 237, 237, 199, 199, 207, 207, 234, 234, 235, 235, 192, 193, 200, 201, 202, 205, 210, 213, 218, 219, 238, 240, 242, 243, 255, -1, 203, 203, 203, 203, 203, 203, 203, 203, 204, 204, 204, 204, 204, 204, 204, 204, 211, 211, 211, 211, 211, 211, 211, 211, 212, 212, 212, 212, 212, 212, 212, 212, 214, 214, 214, 214, 214, 214, 214, 214, 221, 221, 221, 221, 221, 221, 221, 221, 222, 222, 222, 222, 222, 222, 222, 222, 223, 223, 223, 223, 223, 223, 223, 223, 241, 241, 241, 241, 241, 241, 241, 241, 244, 244, 244, 244, 244, 244, 244, 244, 245, 245, 245, 245, 245, 245, 245, 245, 246, 246, 246, 246, 246, 246, 246, 246, 247, 247, 247, 247, 247, 247, 247, 247, 248, 248, 248, 248, 248, 248, 248, 248, 250, 250, 250, 250, 250, 250, 250, 250, 251, 251, 251, 251, 251, 251, 251, 251, 252, 252, 252, 252, 252, 252, 252, 252, 253, 253, 253, 253, 253, 253, 253, 253, 254, 254, 254, 254, 254, 254, 254, 254, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 11, 11, 11, 11, 12, 12, 12, 12, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 23, 23, 23, 23, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, 127, 127, 127, 127, 220, 220, 220, 220, 249, 249, 249, 249, 10, 13, 22, 256, 93, 93, 93, 93, 126, 126, 126, 126, 94, 94, 125, 125, 60, 96, 123, -1, 92, 195, 208, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 128, 128, 128, 128, 128, 128, 128, 128, 130, 130, 130, 130, 130, 130, 130, 130, 131, 131, 131, 131, 131, 131, 131, 131, 162, 162, 162, 162, 162, 162, 162, 162, 184, 184, 184, 184, 184, 184, 184, 184, 194, 194, 194, 194, 194, 194, 194, 194, 224, 224, 224, 224, 224, 224, 224, 224, 226, 226, 226, 226, 226, 226, 226, 226, 153, 153, 153, 153, 161, 161, 161, 161, 167, 167, 167, 167, 172, 172, 172, 172, 176, 176, 176, 176, 177, 177, 177, 177, 179, 179, 179, 179, 209, 209, 209, 209, 216, 216, 216, 216, 217, 217, 217, 217, 227, 227, 227, 227, 229, 229, 229, 229, 230, 230, 230, 230, 129, 129, 132, 132, 133, 133, 134, 134, 136, 136, 146, 146, 154, 154, 156, 156, 160, 160, 163, 163, 164, 164, 169, 169, 170, 170, 173, 173, 178, 178, 181, 181, 185, 185, 186, 186, 187, 187, 189, 189, 190, 190, 196, 196, 198, 198, 228, 228, 232, 232, 233, 233, 1, 135, 137, 138, 139, 140, 141, 143, 147, 149, 150, 151, 152, 155, 157, 158, 165, 166, 168, 174, 175, 180, 182, 183, 188, 191, 197, 231, 239, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 9, 9, 9, 9, 9, 9, 9, 9, 142, 142, 142, 142, 142, 142, 142, 142, 144, 144, 144, 144, 144, 144, 144, 144, 145, 145, 145, 145, 145, 145, 145, 145, 148, 148, 148, 148, 148, 148, 148, 148, 159, 159, 159, 159, 159, 159, 159, 159, 171, 171, 171, 171, 171, 171, 171, 171, 206, 206, 206, 206, 206, 206, 206, 206, 215, 215, 215, 215, 215, 215, 215, 215, 225, 225, 225, 225, 225, 225, 225, 225, 236, 236, 236, 236, 236, 236, 236, 236, 237, 237, 237, 237, 237, 237, 237, 237, 199, 199, 199, 199, 207, 207, 207, 207, 234, 234, 234, 234, 235, 235, 235, 235, 192, 192, 193, 193, 200, 200, 201, 201, 202, 202, 205, 205, 210, 210, 213, 213, 218, 218, 219, 219, 238, 238, 240, 240, 242, 242, 243, 243, 255, 255, 203, 204, 211, 212, 214, 221, 222, 223, 241, 244, 245, 246, 247, 248, 250, 251, 252, 253, 254, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30, 30, 30, 30, 30, 30, 30, 30, 31, 31, 31, 31, 31, 31, 31, 31, 127, 127, 127, 127, 127, 127, 127, 127, 220, 220, 220, 220, 220, 220, 220, 220, 249, 249, 249, 249, 249, 249, 249, 249, 10, 10, 13, 13, 22, 22, 256, 256, 67, 67, 67, 67, 67, 67, 67, 67, 68, 68, 68, 68, 68, 68, 68, 68, 95, 95, 95, 95, 95, 95, 95, 95, 98, 98, 98, 98, 98, 98, 98, 98, 100, 100, 100, 100, 100, 100, 100, 100, 102, 102, 102, 102, 102, 102, 102, 102, 103, 103, 103, 103, 103, 103, 103, 103, 104, 104, 104, 104, 104, 104, 104, 104, 108, 108, 108, 108, 108, 108, 108, 108, 109, 109, 109, 109, 109, 109, 109, 109, 110, 110, 110, 110, 110, 110, 110, 110, 112, 112, 112, 112, 112, 112, 112, 112, 114, 114, 114, 114, 114, 114, 114, 114, 117, 117, 117, 117, 117, 117, 117, 117, 58, 58, 58, 58, 66, 66, 66, 66, 67, 67, 67, 67, 68, 68, 68, 68, 69, 69, 69, 69, 70, 70, 70, 70, 71, 71, 71, 71, 72, 72, 72, 72, 73, 73, 73, 73, 74, 74, 74, 74, 75, 75, 75, 75, 76, 76, 76, 76, 77, 77, 77, 77, 78, 78, 78, 78, 79, 79, 79, 79, 80, 80, 80, 80, 81, 81, 81, 81, 82, 82, 82, 82, 83, 83, 83, 83, 84, 84, 84, 84, 85, 85, 85, 85, 86, 86, 86, 86, 87, 87, 87, 87, 89, 89, 89, 89, 106, 106, 106, 106, 107, 107, 107, 107, 113, 113, 113, 113, 118, 118, 118, 118, 119, 119, 119, 119, 120, 120, 120, 120, 121, 121, 121, 121, 122, 122, 122, 122, 38, 38, 42, 42, 44, 44, 59, 59, 88, 88, 90, 90, -1, -1, -1, -1, 33, 33, 33, 33, 33, 33, 33, 33, 34, 34, 34, 34, 34, 34, 34, 34, 40, 40, 40, 40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 41, 41, 41, 63, 63, 63, 63, 63, 63, 63, 63, 39, 39, 39, 39, 43, 43, 43, 43, 124, 124, 124, 124, 35, 35, 62, 62, 0, 36, 64, 91, 93, 126, -1, -1, 94, 94, 94, 94, 94, 94, 94, 94, 125, 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185, 185, 185, 186, 186, 186, 186, 186, 186, 186, 186, 187, 187, 187, 187, 187, 187, 187, 187, 189, 189, 189, 189, 189, 189, 189, 189, 190, 190, 190, 190, 190, 190, 190, 190, 196, 196, 196, 196, 196, 196, 196, 196, 198, 198, 198, 198, 198, 198, 198, 198, 228, 228, 228, 228, 228, 228, 228, 228, 232, 232, 232, 232, 232, 232, 232, 232, 233, 233, 233, 233, 233, 233, 233, 233, 1, 1, 1, 1, 135, 135, 135, 135, 137, 137, 137, 137, 138, 138, 138, 138, 139, 139, 139, 139, 140, 140, 140, 140, 141, 141, 141, 141, 143, 143, 143, 143, 147, 147, 147, 147, 149, 149, 149, 149, 150, 150, 150, 150, 151, 151, 151, 151, 152, 152, 152, 152, 155, 155, 155, 155, 157, 157, 157, 157, 158, 158, 158, 158, 165, 165, 165, 165, 166, 166, 166, 166, 168, 168, 168, 168, 174, 174, 174, 174, 175, 175, 175, 175, 180, 180, 180, 180, 182, 182, 182, 182, 183, 183, 183, 183, 188, 188, 188, 188, 191, 191, 191, 191, 197, 197, 197, 197, 231, 231, 231, 231, 239, 239, 239, 239, 9, 9, 142, 142, 144, 144, 145, 145, 148, 148, 159, 159, 171, 171, 206, 206, 215, 215, 225, 225, 236, 236, 237, 237, 199, 207, 234, 235, 192, 192, 192, 192, 192, 192, 192, 192, 193, 193, 193, 193, 193, 193, 193, 193, 200, 200, 200, 200, 200, 200, 200, 200, 201, 201, 201, 201, 201, 201, 201, 201, 202, 202, 202, 202, 202, 202, 202, 202, 205, 205, 205, 205, 205, 205, 205, 205, 210, 210, 210, 210, 210, 210, 210, 210, 213, 213, 213, 213, 213, 213, 213, 213, 218, 218, 218, 218, 218, 218, 218, 218, 219, 219, 219, 219, 219, 219, 219, 219, 238, 238, 238, 238, 238, 238, 238, 238, 240, 240, 240, 240, 240, 240, 240, 240, 242, 242, 242, 242, 242, 242, 242, 242, 243, 243, 243, 243, 243, 243, 243, 243, 255, 255, 255, 255, 255, 255, 255, 255, 203, 203, 203, 203, 204, 204, 204, 204, 211, 211, 211, 211, 212, 212, 212, 212, 214, 214, 214, 214, 221, 221, 221, 221, 222, 222, 222, 222, 223, 223, 223, 223, 241, 241, 241, 241, 244, 244, 244, 244, 245, 245, 245, 245, 246, 246, 246, 246, 247, 247, 247, 247, 248, 248, 248, 248, 250, 250, 250, 250, 251, 251, 251, 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115, 115, 116, 116, 116, 116, 116, 116, 116, 116, 32, 32, 32, 32, 37, 37, 37, 37, 45, 45, 45, 45, 46, 46, 46, 46, 47, 47, 47, 47, 51, 51, 51, 51, 52, 52, 52, 52, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55, 56, 56, 56, 56, 57, 57, 57, 57, 61, 61, 61, 61, 65, 65, 65, 65, 95, 95, 95, 95, 98, 98, 98, 98, 100, 100, 100, 100, 102, 102, 102, 102, 103, 103, 103, 103, 104, 104, 104, 104, 108, 108, 108, 108, 109, 109, 109, 109, 110, 110, 110, 110, 112, 112, 112, 112, 114, 114, 114, 114, 117, 117, 117, 117, 58, 58, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71, 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79, 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87, 89, 89, 106, 106, 107, 107, 113, 113, 118, 118, 119, 119, 120, 120, 121, 121, 122, 122, 38, 42, 44, 59, 88, 90, -1, -1, 33, 33, 33, 33, 34, 34, 34, 34, 40, 40, 40, 40, 41, 41, 41, 41, 63, 63, 63, 63, 39, 39, 43, 43, 124, 124, 35, 62, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 36, 36, 36, 36, 36, 36, 36, 36, 64, 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210, 213, 213, 213, 213, 218, 218, 218, 218, 219, 219, 219, 219, 238, 238, 238, 238, 240, 240, 240, 240, 242, 242, 242, 242, 243, 243, 243, 243, 255, 255, 255, 255, 203, 203, 204, 204, 211, 211, 212, 212, 214, 214, 221, 221, 222, 222, 223, 223, 241, 241, 244, 244, 245, 245, 246, 246, 247, 247, 248, 248, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 2, 3, 4, 5, 6, 7, 8, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 127, 220, 249, -1, 10, 10, 10, 10, 13, 13, 13, 13, 22, 22, 22, 22, 256, 256, 256, 256, }; std::vector output; int16_t decode_state; // Parse one half byte... we leverage some lookup tables to keep the logic // here really simple. auto nibble = [&output, &decode_state](uint8_t nibble) { int16_t emit = emit_sub_tbl[16 * emit_tbl[decode_state] + nibble]; int16_t next = next_sub_tbl[16 * next_tbl[decode_state] + nibble]; if (emit != -1) { if (emit >= 0 && emit < 256) { output.push_back(static_cast(emit)); } else { assert(emit == 256); } } decode_state = next; }; for (auto _ : state) { output.clear(); decode_state = 0; for (auto c : *kInput) { nibble(c >> 4); nibble(c & 0xf); } } } BENCHMARK(BM_LegacyDecode); // Some distros have RunSpecifiedBenchmarks under the benchmark namespace, // and others do not. This allows us to support both modes. namespace benchmark { void RunTheBenchmarksNamespaced() { RunSpecifiedBenchmarks(); } } // namespace benchmark int main(int argc, char** argv) { grpc::testing::TestEnvironment env(&argc, argv); benchmark::Initialize(&argc, argv); benchmark::RunTheBenchmarksNamespaced(); return 0; }