SSE has scalar instructions - like "addss", "subss" etc. These will be used by default (at O2 without vectorization enabled) for single-precision floating poin

SSE has scalar instructions - like "addss", "subss" etc. These will be used by default (at O2 without vectorization enabled) for single-precision floating point math on x86-64 (where stack-based FPU is deprecated). Vector instructions you're referring to end with "ps", they're very unlikely to be emitted for typical fp operations.