Exception for System.Random.MWC.Distributions:standard from mwc-random-0.13.3.2

• 25.1% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\begin{array}{l} \\ 0.5 \cdot \left(x \cdot x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 0.5 (- (* x x) y)))

C

double code(double x, double y) {
	return 0.5 * ((x * x) - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 0.5d0 * ((x * x) - y)
end function

Java

public static double code(double x, double y) {
	return 0.5 * ((x * x) - y);
}

Python

def code(x, y):
	return 0.5 * ((x * x) - y)

Julia

function code(x, y)
	return Float64(0.5 * Float64(Float64(x * x) - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 0.5 * ((x * x) - y);
end

Wolfram

code[x_, y_] := N[(0.5 * N[(N[(x * x), $MachinePrecision] - y), $MachinePrecision]), $MachinePrecision]

Reproduce

herbie shell --seed 2024298 
(FPCore (x y)
  :name "System.Random.MWC.Distributions:standard from mwc-random-0.13.3.2"
  :precision binary64
  (* 0.5 (- (* x x) y)))

Please file a bug report with this information.

Backtrace

hash-set!: contract violation expected: (and/c hash? (not/c immutable?)) given: #<procedure:id->egglog> argument position: 1st other arguments...: '!= 'Neq		L	C
platform-spec-nodes	/home/nightlies/herbie/varun10p-egglog/src/core/egglog-herbie.rkt	111	0
prelude	/home/nightlies/herbie/varun10p-egglog/src/core/egglog-herbie.rkt	75	0
run-improve!	/home/nightlies/herbie/varun10p-egglog/src/core/mainloop.rkt	46	0
get-alternatives/report	/home/nightlies/herbie/varun10p-egglog/src/api/sandbox.rkt	186	0
(unnamed)	/home/nightlies/herbie/varun10p-egglog/src/api/sandbox.rkt	282	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24