Intel® Streaming SIMD Extensions

Performance penalty for mixed AVX512 code?

There is a known performance penalty for mixing AVX with legacy code on today's Haswell processors.

  • Will this same problem exist in the Skylake chips and AVX512?
  • Will the delay be even longer for the ZMMs, since there are twice as many to save & restore and they are twice as long?
  • The workaround instruction for this, VZEROUPPER, is not listed as changed in Intel's Instruction Extensions manual. Won't there be changes like zeroing the high portion of the ZMM register?

This is documented by Intel:

全新 Android* 世界的可信赖工具:优化技术 — 从英特尔® SSE 内部指令到英特尔® Cilk™ Plus

作者: 英特尔高级软件应用工程师 Zvi Danovich

简介

大部分的 Android 应用 — 即使是仅基于脚本和管理语言 (Java*, HTML5,…) 的应用 — 最终都会使用中间件功能,因为该功能能够利用优化特性。

本文将介绍基于 Android 的优化需求和方法,并详述一个优化多媒体和增强现实应用的案例。

英特尔为 Android 平台(智能手机和平板电脑)提供了多种不同的英特尔® 凌动™ 处理器,至少包括英特尔® SIMD 流指令扩展补充版(英特尔® SSSE3)级别的矢量功能,通常包括两个内核和超线程。

理解并使用这些优化功能吧!

  • Entwickler
  • Android*
  • Android*
  • Intel® Cilk™ Plus
  • Intel® SSSE3; RGB Transformation; Parallelization
  • Intel® Streaming SIMD Extensions
  • Grafik
  • Optimierung
  • Parallel Computing
  • Scaling TSX to multi-socket systems

    Hi,

    This is my first time posting here, sorry if this is in the wrong subforum.

    To the best of my knowledge, TSX uses the L1 cache coherency protocol to monitor the read/write sets for a transaction. Something which I've been wondering for a while now is how would this scale to systems with >1 processors. I'm not familiar with how such systems maintain cache coherency at L1, but is it feasible for TSX to work correctly and efficiently in these kinds of systems?

    Also, is this why the server variants of Haswell are only available for single socket systems?

    SSE4 Intrensics on Visual Studio 2008

    Hi,

    Am optimizing my code application using Intel SSE intrinsic. It works fine with Intel compiler for 64-bit and 32-bit in MSVC 2008 IDE.

    The same applications behaving differently with MSVC compiler for 32/64- bit run. I would like to know is there any limitation for MSVC 2008 IDE with respect to Intel SSE intrinsics( Am using upto SSE4.2).

    Latest GCC to use with the SDE for MPX?

    I'm aware there are links to download binary versions of GCC at https://software.intel.com/en-us/articles/intel-software-development-emu... however the latest experimental version of GCC appears to be quite more recent than this. However I'm confused about what branch I should be using if I want to build and use the latest MPX enabled development version of GCC with the Intel SDE.

    Documentation bug for DIV/IDIV

    I refer to the current Intel 64 and IA-32 Architectures Software Developer’s Manual (e.g. 325462-051US of June 2014).

    For IDIV your will find that the upper bounds of quotient range is wrong for 32 and 64 bit; these must be e.g. -2^31..2^32-1 instead of -2^31..2^31-1.
    Also, a description for signs the of the remainders are missing; AMD is more precise: "The sign of the remainder is always the same as the sign of the dividend, and the absolute value of the remainder is less than the absolute value of the divisor."

    Working assembly example for MPX?

    Does there already exist some small working example of an assembly program that enables MPX and demonstrates (some) of the instructions -- when executed in the SDE? I am aware that MPX appears to be enabled in libmpx. However I'd like to see this done by hand without using libmpx, assemble the program using an MPX enabled NASM and of course still run it in the SDE, just to play around with it.

    I've already looked for this without finding anything, if someone could point me to such an already existing example that would be great.

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