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| 1 | // Copyright 2019-2022 Cambridge Quantum Computing | |||
| 2 | // | |||
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |||
| 4 | // you may not use this file except in compliance with the License. | |||
| 5 | // You may obtain a copy of the License at | |||
| 6 | // | |||
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 | |||
| 8 | // | |||
| 9 | // Unless required by applicable law or agreed to in writing, software | |||
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, | |||
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||
| 12 | // See the License for the specific language governing permissions and | |||
| 13 | // limitations under the License. | |||
| 14 | ||||
| 15 | #include "HelperFunctions.hpp" | |||
| 16 | ||||
| 17 | namespace tket { | |||
| 18 | ||||
| 19 | 1520 | GrayCode gen_graycode(unsigned m_controls) { | ||
| 20 | 1520 | const unsigned n = m_controls; | ||
| 21 |
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1520 | if (m_controls == 0) return {}; |
| 22 |
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7600 | GrayCode gc{{0}, {1}}; | |
| 23 | ||||
| 24 |
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5071 | for (unsigned i = 2; i < (1u << n); i = i << 1) { |
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23051 | for (unsigned j = 0; j < i; ++j) { |
| 26 |
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19500 | gc.push_back(gc[i - 1 - j]); | |
| 27 | } | |||
| 28 |
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19500 | gc[j].push_back(0); | |
| 30 | } | |||
| 31 |
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23051 | for (unsigned j = i; j < 2 * i; ++j) { |
| 32 |
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19500 | gc[j].push_back(1); | |
| 33 | } | |||
| 34 | } | |||
| 35 | 1520 | return gc; | ||
| 36 | 1520 | } | ||
| 37 | ||||
| 38 | 32 | uint32_t reverse_bits(uint32_t v, unsigned w) { | ||
| 39 | 32 | uint32_t r = 0; | ||
| 40 |
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88 | for (unsigned i = w; i--;) { |
| 41 | 56 | r |= (v & 1) << i; | ||
| 42 | 56 | v >>= 1; | ||
| 43 | } | |||
| 44 | 32 | return r; | ||
| 45 | } | |||
| 46 | ||||
| 47 | } // namespace tket | |||
| 48 |