gcc/testsuite/gfortran.dg/g77/20010116.f

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