\[\frac{\pi}{\sin \left(\pi \cdot z\right)} \cdot \left(\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}^{\left(\left(\left(1 - z\right) - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.99999999999980993 + \frac{676.520368121885099}{\left(\left(1 - z\right) - 1\right) + 1}\right) + \frac{-1259.13921672240281}{\left(\left(1 - z\right) - 1\right) + 2}\right) + \frac{771.32342877765313}{\left(\left(1 - z\right) - 1\right) + 3}\right) + \frac{-176.615029162140587}{\left(\left(1 - z\right) - 1\right) + 4}\right) + \frac{12.5073432786869052}{\left(\left(1 - z\right) - 1\right) + 5}\right) + \frac{-0.138571095265720118}{\left(\left(1 - z\right) - 1\right) + 6}\right) + \frac{9.98436957801957158 \cdot 10^{-6}}{\left(\left(1 - z\right) - 1\right) + 7}\right) + \frac{1.50563273514931162 \cdot 10^{-7}}{\left(\left(1 - z\right) - 1\right) + 8}\right)\right)\]
\frac{\pi}{\sin \left(\pi \cdot z\right)} \cdot \left(\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}^{\left(\left(\left(1 - z\right) - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.99999999999980993 + \frac{676.520368121885099}{\left(\left(1 - z\right) - 1\right) + 1}\right) + \frac{-1259.13921672240281}{\left(\left(1 - z\right) - 1\right) + 2}\right) + \frac{771.32342877765313}{\left(\left(1 - z\right) - 1\right) + 3}\right) + \frac{-176.615029162140587}{\left(\left(1 - z\right) - 1\right) + 4}\right) + \frac{12.5073432786869052}{\left(\left(1 - z\right) - 1\right) + 5}\right) + \frac{-0.138571095265720118}{\left(\left(1 - z\right) - 1\right) + 6}\right) + \frac{9.98436957801957158 \cdot 10^{-6}}{\left(\left(1 - z\right) - 1\right) + 7}\right) + \frac{1.50563273514931162 \cdot 10^{-7}}{\left(\left(1 - z\right) - 1\right) + 8}\right)\right)
double f(double z) {
        double r67440 = atan2(1.0, 0.0);
        double r67441 = z;
        double r67442 = r67440 * r67441;
        double r67443 = sin(r67442);
        double r67444 = r67440 / r67443;
        double r67445 = 2.0;
        double r67446 = r67440 * r67445;
        double r67447 = sqrt(r67446);
        double r67448 = 1.0;
        double r67449 = r67448 - r67441;
        double r67450 = r67449 - r67448;
        double r67451 = 7.0;
        double r67452 = r67450 + r67451;
        double r67453 = 0.5;
        double r67454 = r67452 + r67453;
        double r67455 = r67450 + r67453;
        double r67456 = pow(r67454, r67455);
        double r67457 = r67447 * r67456;
        double r67458 = -r67454;
        double r67459 = exp(r67458);
        double r67460 = r67457 * r67459;
        double r67461 = 0.9999999999998099;
        double r67462 = 676.5203681218851;
        double r67463 = r67450 + r67448;
        double r67464 = r67462 / r67463;
        double r67465 = r67461 + r67464;
        double r67466 = -1259.1392167224028;
        double r67467 = r67450 + r67445;
        double r67468 = r67466 / r67467;
        double r67469 = r67465 + r67468;
        double r67470 = 771.3234287776531;
        double r67471 = 3.0;
        double r67472 = r67450 + r67471;
        double r67473 = r67470 / r67472;
        double r67474 = r67469 + r67473;
        double r67475 = -176.6150291621406;
        double r67476 = 4.0;
        double r67477 = r67450 + r67476;
        double r67478 = r67475 / r67477;
        double r67479 = r67474 + r67478;
        double r67480 = 12.507343278686905;
        double r67481 = 5.0;
        double r67482 = r67450 + r67481;
        double r67483 = r67480 / r67482;
        double r67484 = r67479 + r67483;
        double r67485 = -0.13857109526572012;
        double r67486 = 6.0;
        double r67487 = r67450 + r67486;
        double r67488 = r67485 / r67487;
        double r67489 = r67484 + r67488;
        double r67490 = 9.984369578019572e-06;
        double r67491 = r67490 / r67452;
        double r67492 = r67489 + r67491;
        double r67493 = 1.5056327351493116e-07;
        double r67494 = 8.0;
        double r67495 = r67450 + r67494;
        double r67496 = r67493 / r67495;
        double r67497 = r67492 + r67496;
        double r67498 = r67460 * r67497;
        double r67499 = r67444 * r67498;
        return r67499;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019195 
(FPCore (z)
  :name "Jmat.Real.gamma, branch z less than 0.5"
  (* (/ PI (sin (* PI z))) (* (* (* (sqrt (* PI 2.0)) (pow (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5) (+ (- (- 1.0 z) 1.0) 0.5))) (exp (- (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5)))) (+ (+ (+ (+ (+ (+ (+ (+ 0.9999999999998099 (/ 676.5203681218851 (+ (- (- 1.0 z) 1.0) 1.0))) (/ -1259.1392167224028 (+ (- (- 1.0 z) 1.0) 2.0))) (/ 771.3234287776531 (+ (- (- 1.0 z) 1.0) 3.0))) (/ -176.6150291621406 (+ (- (- 1.0 z) 1.0) 4.0))) (/ 12.507343278686905 (+ (- (- 1.0 z) 1.0) 5.0))) (/ -0.13857109526572012 (+ (- (- 1.0 z) 1.0) 6.0))) (/ 9.984369578019572e-06 (+ (- (- 1.0 z) 1.0) 7.0))) (/ 1.5056327351493116e-07 (+ (- (- 1.0 z) 1.0) 8.0))))))

Backtrace

get-representation: Unknown representation #fLC
(unnamed)/data/pavpan/nightlies/herbie/various-cleanup/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/various-cleanup/src/core/localize.rkt610
localize!/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt1230
run-iter!/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt3230
for-loop/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt3594
run-improve47/data/pavpan/nightlies/herbie/various-cleanup/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