root / synthbench / euroben-dm / mod2b / .svn / text-base / scal.f.svn-base @ 0:839f52ef7657
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Subroutine scal( n, a, x, incx ) |
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Use numerics |
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Implicit None |
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|
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Real(l_) :: a, x(*) |
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Integer :: i, incx, m, mp1, n, nincx |
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! ---------------------------------------------------------------------- |
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If ( n <= 0 ) Return |
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If ( incx /= 1 ) Then |
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nincx = n*incx |
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Do i = 1, nincx, incx |
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x(i) = a*x(i) |
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End Do |
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Return |
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End If |
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m = Mod( n, 5 ) |
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If ( m /= 0 ) Then |
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Do i = 1, m |
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x(i) = a*x(i) |
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End Do |
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If ( n < 5 ) Return |
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End If |
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mp1 = m + 1 |
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Do i = mp1, n, 5 |
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x(i) = a*x(i) |
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x(i+1) = a*x(i+1) |
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x(i+2) = a*x(i+2) |
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x(i+3) = a*x(i+3) |
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x(i+4) = a*x(i+4) |
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End Do |
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! ---------------------------------------------------------------------- |
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End Subroutine scal |