\[\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(z - 1\right) + 7\right) + 0.5\right)}^{\left(\left(z - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(z - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.9999999999998099298181841732002794742584 + \frac{676.5203681218850988443591631948947906494}{\left(z - 1\right) + 1}\right) + \frac{-1259.139216722402807135949842631816864014}{\left(z - 1\right) + 2}\right) + \frac{771.3234287776531346025876700878143310547}{\left(z - 1\right) + 3}\right) + \frac{-176.6150291621405870046146446838974952698}{\left(z - 1\right) + 4}\right) + \frac{12.50734327868690520801919774385169148445}{\left(z - 1\right) + 5}\right) + \frac{-0.1385710952657201178173096423051902092993}{\left(z - 1\right) + 6}\right) + \frac{9.984369578019571583242346146658263705831 \cdot 10^{-6}}{\left(z - 1\right) + 7}\right) + \frac{1.505632735149311617592788074479481785772 \cdot 10^{-7}}{\left(z - 1\right) + 8}\right)\]
\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(z - 1\right) + 7\right) + 0.5\right)}^{\left(\left(z - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(z - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.9999999999998099298181841732002794742584 + \frac{676.5203681218850988443591631948947906494}{\left(z - 1\right) + 1}\right) + \frac{-1259.139216722402807135949842631816864014}{\left(z - 1\right) + 2}\right) + \frac{771.3234287776531346025876700878143310547}{\left(z - 1\right) + 3}\right) + \frac{-176.6150291621405870046146446838974952698}{\left(z - 1\right) + 4}\right) + \frac{12.50734327868690520801919774385169148445}{\left(z - 1\right) + 5}\right) + \frac{-0.1385710952657201178173096423051902092993}{\left(z - 1\right) + 6}\right) + \frac{9.984369578019571583242346146658263705831 \cdot 10^{-6}}{\left(z - 1\right) + 7}\right) + \frac{1.505632735149311617592788074479481785772 \cdot 10^{-7}}{\left(z - 1\right) + 8}\right)
double f(double z) {
        double r98469 = atan2(1.0, 0.0);
        double r98470 = 2.0;
        double r98471 = r98469 * r98470;
        double r98472 = sqrt(r98471);
        double r98473 = z;
        double r98474 = 1.0;
        double r98475 = r98473 - r98474;
        double r98476 = 7.0;
        double r98477 = r98475 + r98476;
        double r98478 = 0.5;
        double r98479 = r98477 + r98478;
        double r98480 = r98475 + r98478;
        double r98481 = pow(r98479, r98480);
        double r98482 = r98472 * r98481;
        double r98483 = -r98479;
        double r98484 = exp(r98483);
        double r98485 = r98482 * r98484;
        double r98486 = 0.9999999999998099;
        double r98487 = 676.5203681218851;
        double r98488 = r98475 + r98474;
        double r98489 = r98487 / r98488;
        double r98490 = r98486 + r98489;
        double r98491 = -1259.1392167224028;
        double r98492 = r98475 + r98470;
        double r98493 = r98491 / r98492;
        double r98494 = r98490 + r98493;
        double r98495 = 771.3234287776531;
        double r98496 = 3.0;
        double r98497 = r98475 + r98496;
        double r98498 = r98495 / r98497;
        double r98499 = r98494 + r98498;
        double r98500 = -176.6150291621406;
        double r98501 = 4.0;
        double r98502 = r98475 + r98501;
        double r98503 = r98500 / r98502;
        double r98504 = r98499 + r98503;
        double r98505 = 12.507343278686905;
        double r98506 = 5.0;
        double r98507 = r98475 + r98506;
        double r98508 = r98505 / r98507;
        double r98509 = r98504 + r98508;
        double r98510 = -0.13857109526572012;
        double r98511 = 6.0;
        double r98512 = r98475 + r98511;
        double r98513 = r98510 / r98512;
        double r98514 = r98509 + r98513;
        double r98515 = 9.984369578019572e-06;
        double r98516 = r98515 / r98477;
        double r98517 = r98514 + r98516;
        double r98518 = 1.5056327351493116e-07;
        double r98519 = 8.0;
        double r98520 = r98475 + r98519;
        double r98521 = r98518 / r98520;
        double r98522 = r98517 + r98521;
        double r98523 = r98485 * r98522;
        return r98523;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 +o rules:numerics
(FPCore (z)
  :name "Jmat.Real.gamma, branch z greater than 0.5"
  (* (* (* (sqrt (* PI 2.0)) (pow (+ (+ (- z 1.0) 7.0) 0.5) (+ (- z 1.0) 0.5))) (exp (- (+ (+ (- z 1.0) 7.0) 0.5)))) (+ (+ (+ (+ (+ (+ (+ (+ 0.9999999999998099 (/ 676.5203681218851 (+ (- z 1.0) 1.0))) (/ -1259.1392167224028 (+ (- z 1.0) 2.0))) (/ 771.3234287776531 (+ (- z 1.0) 3.0))) (/ -176.6150291621406 (+ (- z 1.0) 4.0))) (/ 12.507343278686905 (+ (- z 1.0) 5.0))) (/ -0.13857109526572012 (+ (- z 1.0) 6.0))) (/ 9.984369578019572e-06 (+ (- z 1.0) 7.0))) (/ 1.5056327351493116e-07 (+ (- z 1.0) 8.0)))))

Backtrace

get-representation: Unknown representation #fLC
(unnamed)/data/pavpan/nightlies/herbie/js-tweaks/src/core/localize.rkt2313
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
map/opt/racket-7.0/collects/racket/private/map.rkt3513
parse-loop30/opt/racket-7.0/collects/racket/match/compiler.rkt41815
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
map/opt/racket-7.0/collects/racket/private/map.rkt3513
parse-loop30/opt/racket-7.0/collects/racket/match/compiler.rkt41815
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
map/opt/racket-7.0/collects/racket/private/map.rkt3513
parse-loop30/opt/racket-7.0/collects/racket/match/compiler.rkt41815
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
map/opt/racket-7.0/collects/racket/private/map.rkt3513
parse-loop30/opt/racket-7.0/collects/racket/match/compiler.rkt41815
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
localize-error/data/pavpan/nightlies/herbie/js-tweaks/src/core/localize.rkt610
localize!/data/pavpan/nightlies/herbie/js-tweaks/src/mainloop.rkt1230
run-iter!/data/pavpan/nightlies/herbie/js-tweaks/src/mainloop.rkt3230
for-loop/data/pavpan/nightlies/herbie/js-tweaks/src/mainloop.rkt3594
run-improve47/data/pavpan/nightlies/herbie/js-tweaks/src/mainloop.rkt3420
(unnamed)/opt/racket-7.0/collects/racket/private/more-scheme.rkt26128
run/opt/racket-7.0/share/pkgs/profile-lib/main.rkt392
profile-thunk16/opt/racket-7.0/share/pkgs/profile-lib/main.rkt90
(unnamed)/opt/racket-7.0/collects/racket/private/more-scheme.rkt26128