Possible error in Software Developer’s Manual
Hi,I'm referring to this document:Intel® 64 and IA-32 ArchitecturesSoftware Developer’s ManualCombined Volumes:1, 2A, 2B, 2C, 2D, 3A, 3B, 3C, 3D and 4Order Number: 325462-072USMay 2020There looks to be...
View ArticleWhat does "O" signify in MSR registers description?
A simple question that I haven’t been able to find an answer for. What does R/O signify when discussing MSR (model specific registers) in the Software developers manual? In volume 4, some MSR’s are...
View ArticleIntel please update developer's documentation at lulu.com
Intel, please load the documentation released this month into lulu.com so that we can order the hardcopy:version 72 Software Developer's Manual - 10 volumes version 43 Software Optimization Reference...
View ArticlePinplay's Pinpoints fails on some SPEC2006
Hi,I'm using Pinplay tool v3.11-97998 pinpoints script to determine representative regions for Spec 2006 benchmarks for the reference input sets. 21 SPEC06 benchmarks ran fine on pinpoints.py, but the...
View ArticleSDE on Windows Subsystem for Linux (WSL) fails
Hello,I am trying to run sde64 from Ubuntu 20.04 installed on Windows Subsystem for Linux (WSL) and it fails.strace -o strace.txt sde64 -- /bin/bashE: Fork for injector launcher failed: Bad...
View ArticleWalk through kernel page table entries
I am trying to disable cache for Kernel space. To do so, I would like to modify flags in the page table entries (PTE) of the Kernel. I found examples for walks through PTE of user...
View ArticleXeon Gold 6138 processor to run AVX instructions
Can you enable Intel Xeon Gold 6138 processor to run AVX instructions?Attempting to run the Google Python TensorFlow package of 1.9 -doesn't work tensorFlow 1.5 does (doesn't require AVX instructions)
View ArticleSetting Kernel space to non-cacheable on x86_64 using IA_PAT MSR or page...
I am trying to disable the caching for the Linux operating system only, i.e., Kernel space. I figured out that there are two ways to do this:1- Using MTRR: This turned out to be infeasible as MTRR...
View ArticleAVX Emulator MacOS 10.15
Hi- Sorry for the noob question but I am having no success executing 8.50 under OS 10.15.4, SIP Disabled. Instructions on download page show SDE as a directory but when unpacking tar.bz2 it shows as...
View ArticlePlaidML - What does the __k suffix on kernel names in the PlaidML benchmarks...
When profiling the PlaidML benchmarks, I found that the same kernel was appearing many times, but each time followed by a unique suffix in the form of __k### where ### is a number. The same kernel...
View ArticleManual typo for instruction encoding: REX.R vs REX.B
Hello! I believe that I've found a set of typos in the Intel software developer manuals. I didn't see a forum category for reporting these types of issues; and this board seemed to be the closest to...
View ArticleWas Hardware Lock Elision completely broken by Spectre mitigation?
I'm referring to this:Intrinsics for Hardware Lock Elision OperationsWere these instructions completely broken due to Spectre mitigation for all the CPUs?Are they never coming back?(Should the...
View ArticleWhy does newer Processor(microarchitecture) is run slower than older Processor?
- I'm currently making a game and have fun with assembly stuff.- My development computer use Xeon socket 771 processor: E5440 (Intel core 2 microprocessor)- Today I'm testing my game on Core i7 3770...
View ArticleTSX on Whiskey Lake U
Hi,I wondered if my Intel i5-8265u could use TSX instructions.The documentation at https://ark.intel.com/content/www/de/de/ark/products/149088/intel-core-i... says it does not have TSX-NI.But I read...
View ArticleVP2INTERSECT emulation segfaults
This insn (isolated from a much larger executable) .byte 0x62, 0xf2, 0x7f, 0x48, 0x68, 0x44, 0x22, 0x01which is "vp2intersect k0, zmm0, [rdx*1+40h]", with SDE 8.49.0 consistently causesIn:Thread:...
View ArticleBF16 support in SDE
Hello,while I can see CPUID to report VP2INTERSECT support (with -tgl, albeit not with -future), I didn't manage to find what option (if any) to use to have BF16 emulation enabled. Could you advise...
View Articlepossible SDE regression
Hello,ISTR previously reporting an issue with VPCMPESTRI emulation having VEX.W ignored, and then also having got a fixed SDE version. The just released 8.49.0 looks to misbehave again with the...
View ArticleIntel® Software Development Emulator release 8.49
On March 19th 2020, we released version 8.49 of the Intel® Software Development Emulator. It is available here: http://www.intel.com/software/sde It adds support for new Intel CPUs, drops the support...
View ArticleWhy does not AVX512 improve performance for simple loop
I am new to AVX512 instruction set and I write the following code as demo. #include <iostream> #include <array> #include <chrono> #include <vector> #include <cstring>...
View ArticleAVX - Scalar Comparison
I am comparing the performance of AVX against scalar by doing a multiplication operation on two arrays iteratively. 1) The arrays are evaluated only once and remain same in each iteration. The output...
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