gcc/testsuite/g77.f-torture/execute/20010116.f

   1 *
   2 *  Derived from LAPACK 3.0 routine CHGEQZ
   3 *  Fails on i686-pc-cygwin with gcc-2.97 snapshots at -O2 and higher
   4 *  PR fortran/1645
   5 *
   6 *  David Billinghurst, (David.Billinghurst@riotinto.com)
   7 *  14 January 2001
   8 *  Rewritten by Toon Moene (toon@moene.indiv.nluug.nl)
   9 *  15 January 2001
  10 *
  11       COMPLEX A(5,5)
  12       DATA A/25*(0.0,0.0)/
  13       A(4,3) = (0.05,0.2)/3.0E-7
  14       A(4,4) = (-0.03,-0.4)
  15       A(5,4) = (-2.0E-07,2.0E-07)
  16       CALL CHGEQZ( 5, A )
  17       END
  18       SUBROUTINE CHGEQZ( N, A )
  19       COMPLEX   A(N,N), X
  20       ABS1( X ) = ABS( REAL( X ) ) + ABS( AIMAG( X ) )
  21       DO J = 4, 2, -1
  22          I = J
  23          TEMP  = ABS1( A(J,J) )
  24          TEMP2 = ABS1( A( J+1, J ) )
  25          TEMPR = MAX( TEMP, TEMP2 )
  26          IF( TEMPR .LT. 1.0 .AND. TEMPR .NE. 0.0 ) THEN
  27             TEMP  = TEMP / TEMPR
  28             TEMP2 = TEMP2 / TEMPR
  29          END IF
  30          IF ( ABS1(A(J,J-1))*TEMP2 .LE. TEMP ) GO TO 90
  31       END DO
  32 c     Should not reach here, but need a statement
  33       PRINT*
  34   90  IF ( I .NE. 4 ) THEN
  35          PRINT*,'I =', I, ' but should be 4'
  36          CALL ABORT()
  37       END IF
  38       END