Exception for Quotient of products

• 79.4% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\frac{a1 \cdot a2}{b1 \cdot b2} \]

FPCore

(FPCore (a1 a2 b1 b2) :precision binary64 (/ (* a1 a2) (* b1 b2)))

C

double code(double a1, double a2, double b1, double b2) {
	return (a1 * a2) / (b1 * b2);
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(a1, a2, b1, b2)
use fmin_fmax_functions
    real(8), intent (in) :: a1
    real(8), intent (in) :: a2
    real(8), intent (in) :: b1
    real(8), intent (in) :: b2
    code = (a1 * a2) / (b1 * b2)
end function

Java

public static double code(double a1, double a2, double b1, double b2) {
	return (a1 * a2) / (b1 * b2);
}

Python

def code(a1, a2, b1, b2):
	return (a1 * a2) / (b1 * b2)

Julia

function code(a1, a2, b1, b2)
	return Float64(Float64(a1 * a2) / Float64(b1 * b2))
end

MATLAB

function tmp = code(a1, a2, b1, b2)
	tmp = (a1 * a2) / (b1 * b2);
end

Wolfram

code[a1_, a2_, b1_, b2_] := N[(N[(a1 * a2), $MachinePrecision] / N[(b1 * b2), $MachinePrecision]), $MachinePrecision]

Reproduce

herbie shell --seed 2025191 
(FPCore (a1 a2 b1 b2)
  :name "Quotient of products"
  :precision binary64

  :alt
  (! :herbie-platform c (* (/ a1 b1) (/ a2 b2)))

  (/ (* a1 a2) (* b1 b2)))

Please file a bug report with this information.

Backtrace

egraph-prove: cannot prove (*.f64 (/.f64 a2 b2) (/.f64 a1 b1)) is equal to (/.f64 a1 b2); not equal		L	C
add-derivations-to	/home/nightlies/herbie/batch-reconstruct-alt/src/core/derivations.rkt	16	0
hash-ref!	/usr/share/racket/collects/racket/private/more-scheme.rkt	377	2
loop	.../private/map.rkt	40	19
alt-map	/home/nightlies/herbie/batch-reconstruct-alt/src/utils/alternative.rkt	20	0
loop	.../private/map.rkt	40	19
alt-map	/home/nightlies/herbie/batch-reconstruct-alt/src/utils/alternative.rkt	20	0
add-derivations	/home/nightlies/herbie/batch-reconstruct-alt/src/core/derivations.rkt	30	0
extract!	/home/nightlies/herbie/batch-reconstruct-alt/src/core/mainloop.rkt	70	0
run-improve!	/home/nightlies/herbie/batch-reconstruct-alt/src/core/mainloop.rkt	42	0
get-alternatives	/home/nightlies/herbie/batch-reconstruct-alt/src/api/sandbox.rkt	61	0
(unnamed)	/home/nightlies/herbie/batch-reconstruct-alt/src/api/sandbox.rkt	181	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
in-engine	/home/nightlies/herbie/batch-reconstruct-alt/src/api/sandbox.rkt	197	2
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24