ChipsLobstersabout 2 hours ago
Intel Removes Fake FMA Instruction
2 min read
Intel removed the vfmaddrnd231pd instruction from its 2026 Software Development Manual after users discovered it caused undefined instruction errors on Haswell CPUs despite appearing in the 2024 edition. The manual previously listed the command with unique bit fields for rounding control, but compiler support was absent, suggesting a documentation error before the final release.
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