A researcher investigating an Intel-documented x86 instruction called vfmaddrnd231pd found it does not actually exist on real hardware. The instruction, which purportedly allowed per-instruction rounding control for fused multiply-add operations, is absent from GNU assembler and lacks corresponding intrinsics in both ICC and Clang, and attempting to execute its hand-assembled opcode on a Haswell CPU triggers an undefined instruction fault.
purplesyringa.moe
· 2026-10-12
The Stockfish team has released version 19 of its open-source chess engine, claiming an Elo gain of up to 44 points over version 18 and a win rate more than three times its loss rate in test matches. The update introduces a new SFNNv16 neural network architecture, retires a secondary network added in version 16.1, and switches to universal binaries that auto-detect CPU features instead of requiring manual selection between AVX2, AVX-512 and similar builds. The release also adds native support for RISC-V and LoongArch processors.
stockfishchess.org
· 2026-09-07
GoKawiil