Division computation errors

[roland]

The computation of models with variables occuring at the bottom of a division is incorrect.

For instance the following basic model computes a value for variable x of 0.5 instead of 2.0:

model testDiv
  Real x;
  equation
    ( 1 / x ) * 2 = 1;
end testDiv;

I checked this model with openmodelica 1.6.0 and the latest openmodelica 1.7.0 alpha.

[sjoelund.se]

Some of the ExpressionSolve modules seem to be acting up :(

eq: x = 0.5;
  [j.mo:4:5-4:22]
  partOfLst: within testDiv;
  instanceOptLst: 
  connectEquationOptLst: 
  typeLst: 
  operations: 
    solve:
      2.0 / x = 1.0
      =>
      x = 0.5

[sjoelund.se]

Ok, it used to solve as:
1/x * x2 * x3 = x4 * x5 *x
as:
x = 1 / (x2 * x3 * x4 * x5 *x6)

And:

x1 * x2 * x3 = x4 * x5 *1/x
as:
x = 1 / (x1 * x2 * x3 * x4 *x5)

Which is clearly wrong. Only one side of the equation should be inverted.

It is fixed in OpenModelica r8551