\[\frac{4 \cdot \left(\left(x - y\right) - z \cdot 0.5\right)}{z}\]

\frac{4 \cdot \left(\left(x - y\right) - z \cdot 0.5\right)}{z}

double f(double x, double y, double z) {
        double r462891 = 4.0;
        double r462892 = x;
        double r462893 = y;
        double r462894 = r462892 - r462893;
        double r462895 = z;
        double r462896 = 0.5;
        double r462897 = r462895 * r462896;
        double r462898 = r462894 - r462897;
        double r462899 = r462891 * r462898;
        double r462900 = r462899 / r462895;
        return r462900;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 +o rules:numerics
(FPCore (x y z)
  :name "Data.Array.Repa.Algorithms.ColorRamp:rampColorHotToCold from repa-algorithms-3.4.0.1, B"
  :precision binary64

  :herbie-target
  (- (* 4 (/ x z)) (+ 2 (* 4 (/ y z))))

  (/ (* 4 (- (- x y) (* z 0.5))) z))

Backtrace

get-representation: Unknown representation real		L	C
(unnamed)	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	65	3
filter	/opt/racket-7.2/collects/racket/private/list.rkt	256	2
infer-splitpoints	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	34	0
get-final-combination	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/mainloop.rkt	369	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28