Who is vfmaddrnd231pd??
- October 12, 2026vfmaddrnd231pd is a unique instruction from the FMA instruction set.
- Most instructions in that set have mnemonics like vfmadd231pd, but here rnd means something very specific.
- Most x86 floating-point instructions use the global rounding mode and settings, changing which is pretty slow.
Unverified
- October 12, 2026vfmaddrnd231pd is a unique instruction from the FMA instruction set.
- Most instructions in that set have mnemonics like vfmadd231pd, but here rnd means something very specific.
- Most x86 floating-point instructions use the global rounding mode and settings, changing which is pretty slow.
Sources: Purplesyringa