42 lines
1.1 KiB
Fortran
42 lines
1.1 KiB
Fortran
c { dg-do run }
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c { dg-options "-std=legacy" }
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c
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*
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* Derived from LAPACK 3.0 routine CHGEQZ
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* Fails on i686-pc-cygwin with gcc-2.97 snapshots at -O2 and higher
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* PR fortran/1645
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*
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* David Billinghurst, (David.Billinghurst@riotinto.com)
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* 14 January 2001
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* Rewritten by Toon Moene (toon@moene.indiv.nluug.nl)
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* 15 January 2001
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*
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COMPLEX A(5,5)
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DATA A/25*(0.0,0.0)/
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A(4,3) = (0.05,0.2)/3.0E-7
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A(4,4) = (-0.03,-0.4)
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A(5,4) = (-2.0E-07,2.0E-07)
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CALL CHGEQZ( 5, A )
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END
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SUBROUTINE CHGEQZ( N, A )
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COMPLEX A(N,N), X
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ABS1( X ) = ABS( REAL( X ) ) + ABS( AIMAG( X ) )
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DO J = 4, 2, -1
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I = J
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TEMP = ABS1( A(J,J) )
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TEMP2 = ABS1( A( J+1, J ) )
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TEMPR = MAX( TEMP, TEMP2 )
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IF( TEMPR .LT. 1.0 .AND. TEMPR .NE. 0.0 ) THEN
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TEMP = TEMP / TEMPR
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TEMP2 = TEMP2 / TEMPR
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END IF
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IF ( ABS1(A(J,J-1))*TEMP2 .LE. TEMP ) GO TO 90
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END DO
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c Should not reach here, but need a statement
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PRINT*
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90 IF ( I .NE. 4 ) THEN
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PRINT*,'I =', I, ' but should be 4'
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CALL ABORT()
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END IF
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END
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