\[\left(\left(x \cdot y + z \cdot z\right) + z \cdot z\right) + z \cdot z\]

\left(\left(x \cdot y + z \cdot z\right) + z \cdot z\right) + z \cdot z

double f(double x, double y, double z) {
        double r8013 = x;
        double r8014 = y;
        double r8015 = r8013 * r8014;
        double r8016 = z;
        double r8017 = r8016 * r8016;
        double r8018 = r8015 + r8017;
        double r8019 = r8018 + r8017;
        double r8020 = r8019 + r8017;
        return r8020;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (x y z)
  :name "Linear.Quaternion:$c/ from linear-1.19.1.3, A"

  :herbie-target
  (+ (* (* 3.0 z) z) (* y x))

  (+ (+ (+ (* x y) (* z z)) (* z z)) (* z z)))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28