version 1.6, 2010/12/21 13:51:25
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version 1.7, 2011/07/22 07:38:01
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Line 28
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Line 28
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INTRINSIC MOD |
INTRINSIC MOD |
* .. |
* .. |
IF (N.LE.0) RETURN |
IF (N.LE.0) RETURN |
IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 |
IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN |
* |
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* code for unequal increments or equal increments not equal |
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* to 1 |
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* |
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IX = 1 |
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IY = 1 |
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IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
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IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
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DO 10 I = 1,N |
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DTEMP = DX(IX) |
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DX(IX) = DY(IY) |
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DY(IY) = DTEMP |
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IX = IX + INCX |
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IY = IY + INCY |
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10 CONTINUE |
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RETURN |
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* |
* |
* code for both increments equal to 1 |
* code for both increments equal to 1 |
* |
* |
* |
* |
* clean-up loop |
* clean-up loop |
* |
* |
20 M = MOD(N,3) |
M = MOD(N,3) |
IF (M.EQ.0) GO TO 40 |
IF (M.NE.0) THEN |
DO 30 I = 1,M |
DO I = 1,M |
DTEMP = DX(I) |
DTEMP = DX(I) |
DX(I) = DY(I) |
DX(I) = DY(I) |
DY(I) = DTEMP |
DY(I) = DTEMP |
30 CONTINUE |
END DO |
IF (N.LT.3) RETURN |
IF (N.LT.3) RETURN |
40 MP1 = M + 1 |
END IF |
DO 50 I = MP1,N,3 |
MP1 = M + 1 |
DTEMP = DX(I) |
DO I = MP1,N,3 |
DX(I) = DY(I) |
DTEMP = DX(I) |
DY(I) = DTEMP |
DX(I) = DY(I) |
DTEMP = DX(I+1) |
DY(I) = DTEMP |
DX(I+1) = DY(I+1) |
DTEMP = DX(I+1) |
DY(I+1) = DTEMP |
DX(I+1) = DY(I+1) |
DTEMP = DX(I+2) |
DY(I+1) = DTEMP |
DX(I+2) = DY(I+2) |
DTEMP = DX(I+2) |
DY(I+2) = DTEMP |
DX(I+2) = DY(I+2) |
50 CONTINUE |
DY(I+2) = DTEMP |
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END DO |
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ELSE |
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* |
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* code for unequal increments or equal increments not equal |
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* to 1 |
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* |
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IX = 1 |
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IY = 1 |
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IF (INCX.LT.0) IX = (-N+1)*INCX + 1 |
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IF (INCY.LT.0) IY = (-N+1)*INCY + 1 |
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DO I = 1,N |
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DTEMP = DX(IX) |
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DX(IX) = DY(IY) |
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DY(IY) = DTEMP |
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IX = IX + INCX |
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IY = IY + INCY |
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END DO |
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END IF |
RETURN |
RETURN |
END |
END |