# Intrinsics Generating Vectors of Undefined Values

Parent topic: Intrinsics for Intel® Advanced Vector Extensions

- _mm256_undefined_ps()
  Returns a vector of eight single precision floating point elements. No corresponding Intel® AVX instruction.
- _mm256_undefined_pd()
  Returns a vector of four double precision floating point elements. No corresponding Intel® AVX instruction.
- _mm256_undefined_si256
  Returns a vector of eight packed doubleword integer elements. No corresponding Intel® AVX instruction.