I saw on stackoverflow, there are “Parallel bit deposit and extract” instructions, which are part of BMI2 (Bit Manipulation Instruction Set 2). Are these instructions (PDEP and PEXT) available to Julia / LLVM? algorithm - Find nth SET bit in an int - Stack Overflow ) x86 Bit manipulation instructi…

I’ve used this: function has_bmi2() CPUInfo = zeros(Int32, 4) ccall(:jl_cpuidex, Cvoid, (Ptr{Cint}, Cint, Cint), CPUInfo, 7, 0) CPUInfo[2] & 0x100 != 0 end Cf. this post . There’s also CpuId.jl .

Bit Manipulation Instruction Set

General Usage

StefanKarpinski October 20, 2017, 11:04pm 6

I did, but only on a machine that supported that instruction set, of course.

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Bit Manipulation Instruction Set

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