C Derived from lapack
|
C Derived from lapack
|
PROGRAM test
|
PROGRAM test
|
DOUBLE PRECISION DA
|
DOUBLE PRECISION DA
|
INTEGER I, N
|
INTEGER I, N
|
DOUBLE PRECISION DX(9),DY(9)
|
DOUBLE PRECISION DX(9),DY(9)
|
|
|
EXTERNAL DAXPY
|
EXTERNAL DAXPY
|
N=5
|
N=5
|
DA=1.0
|
DA=1.0
|
DATA DX/-2, -1, -3, -4, 1, 2, 10, 15, 14/
|
DATA DX/-2, -1, -3, -4, 1, 2, 10, 15, 14/
|
DATA DY/0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0/
|
DATA DY/0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0/
|
CALL DAXPY (N,DA,DX,DY)
|
CALL DAXPY (N,DA,DX,DY)
|
DO 10 I = 1, N
|
DO 10 I = 1, N
|
if (DX(I).ne.DY(I)) call abort
|
if (DX(I).ne.DY(I)) call abort
|
10 CONTINUE
|
10 CONTINUE
|
STOP
|
STOP
|
END
|
END
|
|
|
SUBROUTINE DAXPY(N,DA,DX,DY)
|
SUBROUTINE DAXPY(N,DA,DX,DY)
|
DOUBLE PRECISION DA
|
DOUBLE PRECISION DA
|
INTEGER N
|
INTEGER N
|
DOUBLE PRECISION DX(*),DY(*)
|
DOUBLE PRECISION DX(*),DY(*)
|
INTEGER I,IX,IY,M,MP1
|
INTEGER I,IX,IY,M,MP1
|
INTRINSIC MOD
|
INTRINSIC MOD
|
IF (N.LE.0) RETURN
|
IF (N.LE.0) RETURN
|
20 M = MOD(N,4)
|
20 M = MOD(N,4)
|
IF (M.EQ.0) GO TO 40
|
IF (M.EQ.0) GO TO 40
|
DO 30 I = 1,M
|
DO 30 I = 1,M
|
DY(I) = DY(I) + DA*DX(I)
|
DY(I) = DY(I) + DA*DX(I)
|
30 CONTINUE
|
30 CONTINUE
|
IF (N.LT.4) RETURN
|
IF (N.LT.4) RETURN
|
40 MP1 = M + 1
|
40 MP1 = M + 1
|
DO 50 I = MP1,N,4
|
DO 50 I = MP1,N,4
|
DY(I) = DY(I) + DA*DX(I)
|
DY(I) = DY(I) + DA*DX(I)
|
DY(I+1) = DY(I+1) + DA*DX(I+1)
|
DY(I+1) = DY(I+1) + DA*DX(I+1)
|
DY(I+2) = DY(I+2) + DA*DX(I+2)
|
DY(I+2) = DY(I+2) + DA*DX(I+2)
|
DY(I+3) = DY(I+3) + DA*DX(I+3)
|
DY(I+3) = DY(I+3) + DA*DX(I+3)
|
50 CONTINUE
|
50 CONTINUE
|
RETURN
|
RETURN
|
END
|
END
|
|
|
