\[\frac{\left(\left(\left(x \cdot y + z\right) \cdot y + 27464.7644704999984242022037506103515625\right) \cdot y + 230661.5106160000141244381666183471679688\right) \cdot y + t}{\left(\left(\left(y + a\right) \cdot y + b\right) \cdot y + c\right) \cdot y + i}\]

\frac{\left(\left(\left(x \cdot y + z\right) \cdot y + 27464.7644704999984242022037506103515625\right) \cdot y + 230661.5106160000141244381666183471679688\right) \cdot y + t}{\left(\left(\left(y + a\right) \cdot y + b\right) \cdot y + c\right) \cdot y + i}

double f(double x, double y, double z, double t, double a, double b, double c, double i) {
        double r8494771 = x;
        double r8494772 = y;
        double r8494773 = r8494771 * r8494772;
        double r8494774 = z;
        double r8494775 = r8494773 + r8494774;
        double r8494776 = r8494775 * r8494772;
        double r8494777 = 27464.7644705;
        double r8494778 = r8494776 + r8494777;
        double r8494779 = r8494778 * r8494772;
        double r8494780 = 230661.510616;
        double r8494781 = r8494779 + r8494780;
        double r8494782 = r8494781 * r8494772;
        double r8494783 = t;
        double r8494784 = r8494782 + r8494783;
        double r8494785 = a;
        double r8494786 = r8494772 + r8494785;
        double r8494787 = r8494786 * r8494772;
        double r8494788 = b;
        double r8494789 = r8494787 + r8494788;
        double r8494790 = r8494789 * r8494772;
        double r8494791 = c;
        double r8494792 = r8494790 + r8494791;
        double r8494793 = r8494792 * r8494772;
        double r8494794 = i;
        double r8494795 = r8494793 + r8494794;
        double r8494796 = r8494784 / r8494795;
        return r8494796;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(FPCore (x y z t a b c i)
  :name "Numeric.SpecFunctions:logGamma from math-functions-0.1.5.2"
  (/ (+ (* (+ (* (+ (* (+ (* x y) z) y) 27464.7644705) y) 230661.510616) y) t) (+ (* (+ (* (+ (* (+ y a) y) b) y) c) y) i)))

Backtrace

hash-ref: no value found for key key: #<enode 740(740)>		L	C
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	197	2
extractor-extract	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	196	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	35	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-iter!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	320	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	354	4
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/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