Original Version

1 files changed, 49 insertions, 0 deletions

diff --git a/2.3-1/src/fortran/blas/ddot.f b/2.3-1/src/fortran/blas/ddot.f
new file mode 100644
index 00000000..e04c7c25
--- /dev/null
+++ b/2.3-1/src/fortran/blas/ddot.f
@@ -0,0 +1,49 @@
+      double precision function ddot(n,dx,incx,dy,incy)
+c
+c     forms the dot product of two vectors.
+c     uses unrolled loops for increments equal to one.
+c     jack dongarra, linpack, 3/11/78.
+c     modified 12/3/93, array(1) declarations changed to array(*)
+c
+      double precision dx(*),dy(*),dtemp
+      integer i,incx,incy,ix,iy,m,mp1,n
+c
+      ddot = 0.0d0
+      dtemp = 0.0d0
+      if(n.le.0)return
+      if(incx.eq.1.and.incy.eq.1)go to 20
+c
+c        code for unequal increments or equal increments
+c          not equal to 1
+c
+      ix = 1
+      iy = 1
+      if(incx.lt.0)ix = (-n+1)*incx + 1
+      if(incy.lt.0)iy = (-n+1)*incy + 1
+      do 10 i = 1,n
+        dtemp = dtemp + dx(ix)*dy(iy)
+        ix = ix + incx
+        iy = iy + incy
+   10 continue
+      ddot = dtemp
+      return
+c
+c        code for both increments equal to 1
+c
+c
+c        clean-up loop
+c
+   20 m = mod(n,5)
+      if( m .eq. 0 ) go to 40
+      do 30 i = 1,m
+        dtemp = dtemp + dx(i)*dy(i)
+   30 continue
+      if( n .lt. 5 ) go to 60
+   40 mp1 = m + 1
+      do 50 i = mp1,n,5
+        dtemp = dtemp + dx(i)*dy(i) + dx(i + 1)*dy(i + 1) +
+     *   dx(i + 2)*dy(i + 2) + dx(i + 3)*dy(i + 3) + dx(i + 4)*dy(i + 4)
+   50 continue
+   60 ddot = dtemp
+      return
+      end