\[\frac{\pi}{\sin \left(\pi \cdot z\right)} \cdot \left(\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}^{\left(\left(\left(1 - z\right) - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.99999999999980993 + \frac{676.520368121885099}{\left(\left(1 - z\right) - 1\right) + 1}\right) + \frac{-1259.13921672240281}{\left(\left(1 - z\right) - 1\right) + 2}\right) + \frac{771.32342877765313}{\left(\left(1 - z\right) - 1\right) + 3}\right) + \frac{-176.615029162140587}{\left(\left(1 - z\right) - 1\right) + 4}\right) + \frac{12.5073432786869052}{\left(\left(1 - z\right) - 1\right) + 5}\right) + \frac{-0.138571095265720118}{\left(\left(1 - z\right) - 1\right) + 6}\right) + \frac{9.98436957801957158 \cdot 10^{-6}}{\left(\left(1 - z\right) - 1\right) + 7}\right) + \frac{1.50563273514931162 \cdot 10^{-7}}{\left(\left(1 - z\right) - 1\right) + 8}\right)\right)\]
\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 r57911 = atan2(1.0, 0.0);
        double r57912 = z;
        double r57913 = r57911 * r57912;
        double r57914 = sin(r57913);
        double r57915 = r57911 / r57914;
        double r57916 = 2.0;
        double r57917 = r57911 * r57916;
        double r57918 = sqrt(r57917);
        double r57919 = 1.0;
        double r57920 = r57919 - r57912;
        double r57921 = r57920 - r57919;
        double r57922 = 7.0;
        double r57923 = r57921 + r57922;
        double r57924 = 0.5;
        double r57925 = r57923 + r57924;
        double r57926 = r57921 + r57924;
        double r57927 = pow(r57925, r57926);
        double r57928 = r57918 * r57927;
        double r57929 = -r57925;
        double r57930 = exp(r57929);
        double r57931 = r57928 * r57930;
        double r57932 = 0.9999999999998099;
        double r57933 = 676.5203681218851;
        double r57934 = r57921 + r57919;
        double r57935 = r57933 / r57934;
        double r57936 = r57932 + r57935;
        double r57937 = -1259.1392167224028;
        double r57938 = r57921 + r57916;
        double r57939 = r57937 / r57938;
        double r57940 = r57936 + r57939;
        double r57941 = 771.3234287776531;
        double r57942 = 3.0;
        double r57943 = r57921 + r57942;
        double r57944 = r57941 / r57943;
        double r57945 = r57940 + r57944;
        double r57946 = -176.6150291621406;
        double r57947 = 4.0;
        double r57948 = r57921 + r57947;
        double r57949 = r57946 / r57948;
        double r57950 = r57945 + r57949;
        double r57951 = 12.507343278686905;
        double r57952 = 5.0;
        double r57953 = r57921 + r57952;
        double r57954 = r57951 / r57953;
        double r57955 = r57950 + r57954;
        double r57956 = -0.13857109526572012;
        double r57957 = 6.0;
        double r57958 = r57921 + r57957;
        double r57959 = r57956 / r57958;
        double r57960 = r57955 + r57959;
        double r57961 = 9.984369578019572e-06;
        double r57962 = r57961 / r57923;
        double r57963 = r57960 + r57962;
        double r57964 = 1.5056327351493116e-07;
        double r57965 = 8.0;
        double r57966 = r57921 + r57965;
        double r57967 = r57964 / r57966;
        double r57968 = r57963 + r57967;
        double r57969 = r57931 * r57968;
        double r57970 = r57915 * r57969;
        return r57970;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019195 +o rules:numerics
(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