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Stefano Tommesani

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  • Home
  • Programming
    • SIMD on x64/x86
    • Multi-thread
    • C# and .NET
    • Testing
  • Software
  • Video
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  • About me
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    Vintage CPU collection

    September 10, 2023

    Collecting vintage CPUs, such as the venerable 486, Pentium, and Athlon processors, is a fascinating journey through the history of computing. These iconic chips represent significant milestones in the evolution of personal computing power. The 386, released in the mid-1980s, marked a significant shift towards 32-bit computing and paved the…

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  • C# and .NET - Programming

    Clearing the NuGet cache

    April 16, 2023

    NuGet is the package manager used by .NET to download, restore, and manage package dependencies. Most of the time it works quietly in the background: you add a package, restore the project, and NuGet downloads what is needed. However, NuGet also stores packages and metadata locally. This is good for…

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  • SIMD on x64/x86

    Intel AVX-512 instruction set: 512-bit SIMD, masks, and high-throughput vector computing

    June 24, 2022

    Intel AVX-512 enhances SIMD capabilities by extending AVX2's 256-bit model to 512-bit registers, introducing dedicated mask registers for conditional operations, and offering more vector registers. It's particularly beneficial for scientific computing, AI, and cryptography. However, its availability is limited compared to AVX2, and performance may vary by processor.

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  • C# and .NET - OOD / OOP - Programming

    PriorityQueue in .NET 6: a practical guide

    December 25, 2021

    .NET 6 added a long-missing collection to the base class library: PriorityQueue<TElement, TPriority>. A priority queue is useful when you do not want to process items in the order they were inserted, but in the order of their priority. Typical examples include job scheduling, pathfinding, graph algorithms, simulations, message processing,…

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  • C# and .NET - OOD / OOP - Programming

    Custom comparer of a SortedSet in C#

    December 25, 2021

    SortedSet in .NET manages ordered, unique elements using a custom comparer that defines both sorting order and element uniqueness. A common pitfall occurs when two different instances with the same value are treated as duplicates. To avoid this, a tie-breaker is needed, ensuring both order and distinctness among elements.

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  • YiImport1
    Video

    Easily upload videos of security cameras to YouTube

    April 5, 2021

    Home security cameras have become increasingly popular in recent years, with many homeowners opting to install cameras to keep their homes and families safe. One of the benefits of these cameras is that they can capture footage of potential intruders or other suspicious activity around the home. In this blog…

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  • SIMD on x64/x86

    Intel AVX2 instruction set: 256-bit SIMD for integers, gathers, and modern data processing

    June 24, 2020

    Intel AVX2 is one of the most important SIMD extensions in the x86 instruction set. While the original AVX instruction set introduced 256-bit YMM registers and wider floating-point vector operations, AVX2 extended that model to integer SIMD and made 256-bit vector programming much more broadly useful. AVX2 arrived with Intel’s…

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  • SIMD on x64/x86

    Intel AVX instruction set: 256-bit SIMD for floating-point performance

    June 24, 2020

    Intel AVX, short for Advanced Vector Extensions, marked one of the most important transitions in the history of x86 SIMD programming. It extended the 128-bit SSE model to 256-bit vector registers, introduced a cleaner instruction encoding, and made SIMD code easier for compilers and developers to optimize. AVX was first…

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  • SIMD on x64/x86

    SSE4.2: the SIMD extension focused on strings, CRC, and 64-bit comparisons

    June 24, 2020

    SSE4.2 is the second part of Intel’s SSE4 family. Compared with SSE4.1, it is much smaller and more specialized. SSE4.1 added a broad set of practical SIMD improvements: blends, dot products, rounding, integer min/max operations, widening conversions, insertion and extraction, and several multimedia helpers. SSE4.2 did not continue in that…

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  • SIMD on x64/x86

    SSE4.1: the SIMD extension that made 128-bit code more practical

    June 24, 2020

    SSE4.1 is one of the most useful refinement steps in the SSE family. It did not introduce wider vectors, new XMM registers, or the newer AVX encoding model. Instead, it filled many gaps that made SSE2, SSE3, and SSSE3 code awkward. Where SSE3 mostly improved floating-point horizontal operations, and SSSE3…

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Vintage CPUs of the day

  • Intel 386 DX 25 MHz Intel 386 DX 25 MHz
  • Mystery 486s... Mystery 486s...
  • Intel Pentium III 800EB Intel Pentium III 800EB
  • Intel Pentium III 600EB Intel Pentium III 600EB

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