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by dragontamer
1481 days ago
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8x 64-bit is 512-bit, which is designed for AVX512. You'll probably need AVX512 to fully benefit from unrolling x8. 4x 64-bit is 256-bit, which requires special compiler flags for 256-bit AVX2, but most x86 CPUs should support them these days. 2x64-bit is 128-bit, which fits in default SSE 128-bit SIMD with default GCC / Visual Studio compiler flags. |
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