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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
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