Those are scalar instructions, not the SIMD instructions. With x86_64 the fpu stack operations are basically for legacy purposes only, and normal floating point

Those are scalar instructions, not the SIMD instructions. With x86_64 the fpu stack operations are basically for legacy purposes only, and normal floating point operations are expected to be done with the SSE/AVX scalar instructions. SIMD instruction used the packed variants of the commands allowing you to multiple say 4 floats in a single instruction.