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Daniel Lemire
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More tweaks.
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doc/performance.md

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@@ -165,6 +165,4 @@ On some Intel processors, using SIMD instructions in a sustained manner on the s
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- [Whenever 512-bit AVX-512 instructions are used](https://lemire.me/blog/2018/09/07/avx-512-when-and-how-to-use-these-new-instructions/).
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- Whenever heavy 256-bit or wider instructions are used. Heavy instructions are those involving floating point operations or integer multiplications (since these execute on the floating point unit).
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The simdjson library does not currently support AVX-512 instructions and it does not make use of heavy 256-bit instructions. Thus there is no downclocking due to simdjson.
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For other reasons, you may still be worried about which SIMD instruction set is used by simdjson. Thankfully, [you can always determine and change which architecture-specific implementation is used](implementation-selection.md). Thus even if your CPU supports AVX2, you do not need to use AVX2.
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The simdjson library does not currently support AVX-512 instructions and it does not make use of heavy 256-bit instructions. Thus there should be no downclocking due to simdjson on recent processors. You may still be worried about which SIMD instruction set is used by simdjson. Thankfully, [you can always determine and change which architecture-specific implementation is used](implementation-selection.md). Thus even if your CPU supports AVX2, you do not need to use AVX2. You are in control.

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