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c { dg-do run }

c { dg-options "-std=legacy" }

c

*

*  Derived from LAPACK 3.0 routine CHGEQZ

*  Fails on i686-pc-cygwin with gcc-2.97 snapshots at -O2 and higher

*  PR fortran/1645

*

*  David Billinghurst, (David.Billinghurst@riotinto.com)

*  14 January 2001

*  Rewritten by Toon Moene (toon@moene.indiv.nluug.nl)

*  15 January 2001

*

      COMPLEX A(5,5)

      DATA A/25*(0.0,0.0)/

      A(4,3) = (0.05,0.2)/3.0E-7

      A(4,4) = (-0.03,-0.4)

      A(5,4) = (-2.0E-07,2.0E-07)

      CALL CHGEQZ( 5, A )

      END

      SUBROUTINE CHGEQZ( N, A )

      COMPLEX   A(N,N), X

      ABS1( X ) = ABS( REAL( X ) ) + ABS( AIMAG( X ) )

      DO J = 4, 2, -1

         I = J

         TEMP  = ABS1( A(J,J) )

         TEMP2 = ABS1( A( J+1, J ) )

         TEMPR = MAX( TEMP, TEMP2 )

         IF( TEMPR .LT. 1.0 .AND. TEMPR .NE. 0.0 ) THEN

            TEMP  = TEMP / TEMPR

            TEMP2 = TEMP2 / TEMPR

         END IF

         IF ( ABS1(A(J,J-1))*TEMP2 .LE. TEMP ) GO TO 90

      END DO

c     Should not reach here, but need a statement

      PRINT*

  90  IF ( I .NE. 4 ) THEN

         PRINT*,'I =', I, ' but should be 4'

         CALL ABORT()

      END IF

      END