{"type":"doc","content":[{"type":"paragraph","content":[{"text":"This is a list of x64 intrinsics used in many popular codebases but is lacking an ARM64 implementation and an alternative MSVC intrinsics.","type":"text"}]},{"type":"paragraph","content":[{"text":"An alternative ARM64 implementation in C is provided to help developers port code for windows arm64 targets.","type":"text"}]},{"type":"table","attrs":{"layout":"full-width","isNumberColumnEnabled":true,"localId":"2fbb9902-ed3d-43cf-b4b4-a239cf4d6997"},"content":[{"type":"tableRow","content":[{"type":"tableHeader","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"Intrinsics / Windows API","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableHeader","attrs":{"colspan":1,"rowspan":1,"colwidth":[256.0]},"content":[{"type":"paragraph","content":[{"text":"Description","type":"text","marks":[{"type":"strong"}]}]}]},{"type":"tableHeader","attrs":{"colspan":1,"rowspan":1,"colwidth":[748.0]},"content":[{"type":"paragraph","content":[{"text":"ARM64 alternative implementation","type":"text","marks":[{"type":"strong"}]}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"_umul128","type":"text","marks":[{"type":"link","attrs":{"href":"https://docs.microsoft.com/en-us/cpp/intrinsics/umul128?view=msvc-170"}}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":2,"colwidth":[256.0]},"content":[{"type":"paragraph","content":[{"text":"128-bit unsigned multiplication","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":2,"colwidth":[748.0]},"content":[{"type":"codeBlock","attrs":{"language":"c"},"content":[{"text":"#pragma intrinsic(__umulh)\n\nuint64_t _umul128(uint64_t a, uint64_t b, uint64_t *high) {\n *high = __umulh(a, b);\n return a * b;\n}\n","type":"text"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"UnsignedMultiply128","type":"text","marks":[{"type":"link","attrs":{"href":"https://docs.microsoft.com/en-us/windows/win32/api/winnt/nf-winnt-unsignedmultiply128"}}]}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"_addcarry_u64","type":"text","marks":[{"type":"link","attrs":{"href":"https://docs.microsoft.com/en-us/cpp/intrinsics/x64-amd64-intrinsics-list?view=msvc-170"}}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[256.0]},"content":[{"type":"paragraph","content":[{"text":"64-bit add with carry returning the carry flag","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[748.0]},"content":[{"type":"codeBlock","attrs":{"language":"c"},"content":[{"text":"uint64_t addcarry(uint64_t x, uint64_t y, uint64_t carry_in, uint64_t *sum) {\n *sum = x + y + (carry_in !=0 ? 1 : 0);\n return x > UINT32_MAX - y;\n}","type":"text"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"__rdtsc","type":"text","marks":[{"type":"link","attrs":{"href":"https://docs.microsoft.com/en-us/cpp/intrinsics/rdtsc?view=msvc-170"}}]}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[256.0]},"content":[{"type":"paragraph","content":[{"text":"Processor time stamp - Number of clock cycles since reset","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[748.0]},"content":[{"type":"codeBlock","attrs":{"language":"c"},"content":[{"text":" int64_t processor_cycle_count() {\n const int64_t pmccntr_el0 = (((3 & 1) << 14) | // op0\n ((3 & 7) << 11) | // op1\n ((9 & 15) << 7) | // crn\n ((13 & 15) << 3) | // crm\n ((0 & 7) << 0)); // op2\n return _ReadStatusReg (pmccntr_el0);\n }","type":"text"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[537.0]},"content":[{"type":"paragraph","content":[{"text":"__popcnt","type":"text","marks":[{"type":"link","attrs":{"href":"https://docs.microsoft.com/en-us/cpp/intrinsics/popcnt16-popcnt-popcnt64"}}]},{"text":" and variants","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[256.0]},"content":[{"type":"paragraph","content":[{"text":"Counts the number of ","type":"text"},{"text":"1","type":"text","marks":[{"type":"code"}]},{"text":" bits (population count) in a 16-, 32-, or 64-bit unsigned integer.","type":"text"}]}]},{"type":"tableCell","attrs":{"colspan":1,"rowspan":1,"colwidth":[748.0]},"content":[{"type":"paragraph"}]}]}]},{"type":"paragraph"}],"version":1}

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