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The vfmaddrnd231pd Instruction: Documented in Intel SDM but Never Built
2026-10-14•SiTech AI Team

The vfmaddrnd231pd Instruction: Documented in Intel SDM but Never Built

A mysterious FMA instruction, vfmaddrnd231pd, appears in Intel's 2024 Software Developer's Manual but raises an undefined instruction error on real hardware. A blog investigation traces it to abandoned AVX10 rounding experiments.