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

\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 r4652258 = x;
        double r4652259 = y;
        double r4652260 = r4652258 * r4652259;
        double r4652261 = z;
        double r4652262 = r4652260 + r4652261;
        double r4652263 = r4652262 * r4652259;
        double r4652264 = 27464.7644705;
        double r4652265 = r4652263 + r4652264;
        double r4652266 = r4652265 * r4652259;
        double r4652267 = 230661.510616;
        double r4652268 = r4652266 + r4652267;
        double r4652269 = r4652268 * r4652259;
        double r4652270 = t;
        double r4652271 = r4652269 + r4652270;
        double r4652272 = a;
        double r4652273 = r4652259 + r4652272;
        double r4652274 = r4652273 * r4652259;
        double r4652275 = b;
        double r4652276 = r4652274 + r4652275;
        double r4652277 = r4652276 * r4652259;
        double r4652278 = c;
        double r4652279 = r4652277 + r4652278;
        double r4652280 = r4652279 * r4652259;
        double r4652281 = i;
        double r4652282 = r4652280 + r4652281;
        double r4652283 = r4652271 / r4652282;
        return r4652283;
}

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