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

mbauman Split this topic November 6, 2020, 2:37pm 11

2 posts were split to a new topic: What’s the fastest CPU execution model?

Topic		Replies	Views
I'm looking at some nice AVX2 instructions, and I'm wondering if there is a path t General Usage	1	803	March 6, 2021
Functions for low-level arithmetic Internals & Design	5	1076	March 29, 2017
Bit manipulations with llvmcall give strange results General Usage llvm	11	312	March 9, 2024
Calling AVX-512 intrinsics from Julia General Usage bit-twiddling	6	694	July 4, 2023
ANN: BitIntegers.jl (Int256, ...) and BitFloats.jl (Float80, Float128) Community package , announcement	8	1704	January 24, 2022

Bit Manipulation Instruction Set

Related topics