GitLab

Bugzilla Link	22
Created on	Oct 13, 2003 19:34
Resolution	FIXED
Resolved on	Jul 30, 2011 16:19
Version	1.00beta
OS	All
Architecture	All
Attachments	bug22.sac

Extended Description

Even on single-processor machines (!) MT produces wrong results for complicated
with-loop generator layouts.
**** SAC program to reproduce the error: ******
import StdIO: all;
int main()
{
  A = with (. <= idx <= . step [2,1])
      genarray( [13,7], [1,2,3]);
  B = with (. <= idx <= . step [1,2])  /* or: step [1,1] */
      genarray( [13,7], [4,5,6]);
  C = with (. <= idx <= .)
      modarray( A, idx, A[idx] + B[idx]);
  print( C);
  return( 0);
}
****** sac2c call: *******************
sac2c -mt   (use the OLD backend!!)
****** program call: *****************
a.out -mt 1      -> correct result
a.out -mt 5      -> wrong result
**************************************
With multiple threads used, the result array contains wrong values.
Since this problem occurs even on single-processor machines, it may be caused by
the scheduler which may calculate wrong/illegal iteration bounds for some threads.