Who is vfmaddrnd231pd?(purplesyringa.moe)
243 points by pngmangi | 21 comments
Blog post examining the x86 FMA instruction vfmaddrnd231pd, which performs fused multiply-add with per-instruction rounding control.
#x86 on Hacker News
19 stories tagged x86, newest first.
Hardware backdoors in some x86 CPUs(github.com)
351 points by epestr | 95 comments
GitHub repository for Project Rosenbridge by xoreaxeaxeax, documenting and demonstrating a hardware backdoor found in some x86 CPUs.
Assembly Hall of Shame(github.com)
403 points by piotrgrabowski | 99 comments
GitHub repository by xoreaxeaxeax collecting x86 assembly instructions and code patterns that perform pathologically slowly, such as clflush, cpuid, denormals and fdiv.
The time the x86 emulator team found code so bad they fixed it during emulation(devblogs.microsoft.com)
465 points by paulmooreparks | 149 comments
Raymond Chen's The Old New Thing post recounting how a Windows x86-32 emulator team, using binary translation, patched badly written application code during emulation.
Why xor eax, eax?(xania.org)
518 points by hasheddan | 189 comments
Matt Godbolt's blog post explaining why compilers emit xor eax, eax to zero a register on x86 and why it is among the most executed instructions.
Visopsys: OS maintained by a single developer since 1997(visopsys.org)
471 points by kome | 124 comments
Homepage of Visopsys, a small open-source alternative operating system for PCs developed by a single developer since 1997.
The Linux Boot Process: From Power Button to Kernel(0xkato.xyz)
428 points by 0xkato | 84 comments
A blog post explaining the Linux boot process step by step, from pressing the power button through firmware and bootloader to the first C code in the kernel.
Nvidia buys $5B in Intel(tomshardware.com)
935 points by stycznik | 569 comments
Tom's Hardware report on Nvidia buying $5 billion in Intel stock and the two jointly developing x86 RTX SoCs for PCs and custom data center x86 CPUs.
SkiftOS: A hobby OS built from scratch using C/C++ for ARM, x86, and RISC-V(skiftos.org)
444 points by ksec | 89 comments
Homepage of SkiftOS, a hobby operating system written from scratch in C/C++ targeting ARM, x86, and RISC-V, showing its desktop and terminal.
Ask HN: Why hasn't x86 caught up with Apple M series?
329 points by stephenheron | 434 comments
Ask HN post asking why x86 laptop chips like AMD's Ryzen AI 340 still lag Apple's M1 in battery efficiency and thermals.
FFmpeg Assembly Language Lessons(github.com)
396 points by flykespice | 133 comments
GitHub repository from the FFmpeg project containing lessons teaching assembly language programming as used in FFmpeg, with translations.
Show HN: My self-written hobby OS is finally running on my vintage IBM ThinkPad(github.com)
520 points by joexbayer | 102 comments
GitHub repository for RetrOS-32, a 32-bit x86 hobby operating system with graphics, multitasking, networking and a C compiler for i386.
The little book about OS development(littleosbook.github.io)
343 points by ibobev | 49 comments
The Little Book About OS Development by Erik Helin and Adam Renberg, a free online book guiding readers through writing a simple x86 operating system.
FFmpeg School of Assembly Language(github.com)
774 points by davikr | 206 comments
First lesson in FFmpeg's GitHub-hosted course teaching assembly language programming as used in the FFmpeg multimedia project.
Things I learned while writing an x86 emulator (2013)(timdbg.com)
329 points by fanf2 | 114 comments
Blog post by a former WinDbg developer describing odd x86/amd64 trivia learned while writing the CPU emulator for Microsoft's Time Travel Debugging.
Reptar(lock.cmpxchg8b.com)
557 points by abhi9u | 168 comments
Tavis Ormandy's write-up of Reptar, an Intel CPU bug where redundant instruction prefixes put processors into a glitch state, covering its discovery and fix.
Zenbleed(lock.cmpxchg8b.com)
1160 points by loeg | 327 comments
Tavis Ormandy's writeup of Zenbleed, an AMD Zen 2 CPU vulnerability that leaks data from vector registers, covering exploitation, discovery, and mitigation.
{n} times faster than C(owen.cafe)
381 points by 414owen | 197 comments
Blog post that takes a clang-compiled C loop and hand-tweaks the x86 assembly in various ways, measuring the speedup of each change.
Booting Modern Intel CPUs(mjg59.dreamwidth.org)
351 points by zdw | 107 comments
A blog post by Matthew Garrett on mjg59.dreamwidth.org about how modern Intel CPUs boot; the capture shows a Dreamwidth hCaptcha check page instead.