Feature request: Support for SIMD comparison operators

[adpaco-aws]

Support for SIMD arithmetic operators (e.g., addition or logical operators) exists in CBMC but this is not the case for comparison operators ==, !=, <, >, <= and >=. According to GCC online docs vectors are compared element by element producing a 0 when the comparison is false and -1 otherwise.

I am not able to provide an example since #5903 does not allow to compile, but this is the warning I am getting from CBMC when I run it on code that we generate:

warning: ignoring =
  * type: array
      * #source_location: nil
      * size: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 2
      0: signedbv
          * width: 64
          * #c_type: signed_long_int
  0: array
      * type: array
          * #source_location: nil
          * size: constant
              * type: signedbv
                  * width: 64
                  * #c_type: signed_long_int
              * value: 2
          0: signedbv
              * width: 64
              * #c_type: signed_long_int
      0: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 0
      1: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 0
  1: array
      * type: array
          * #source_location: nil
          * size: constant
              * type: signedbv
                  * width: 64
                  * #c_type: signed_long_int
              * value: 2
          0: signedbv
              * width: 64
              * #c_type: signed_long_int
      0: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 0
      1: constant
          * type: signedbv
              * width: 64
              * #c_type: signed_long_int
          * value: 0

[tautschnig]

Thank you for raising this, will be fixed once #5940 is merged.