1 files changed, 43 insertions, 0 deletions
diff --git a/src/fortran/blas/dscal.f b/src/fortran/blas/dscal.f
new file mode 100644
index 0000000..e1467fa
--- /dev/null
+++ b/src/fortran/blas/dscal.f
@@ -0,0 +1,43 @@
+      subroutine  dscal(n,da,dx,incx)
+c
+c     scales a vector by a constant.
+c     uses unrolled loops for increment equal to one.
+c     jack dongarra, linpack, 3/11/78.
+c     modified 3/93 to return if incx .le. 0.
+c     modified 12/3/93, array(1) declarations changed to array(*)
+c
+      double precision da,dx(*)
+      integer i,incx,m,mp1,n,nincx
+c
+      if( n.le.0 .or. incx.le.0 )return
+      if(incx.eq.1)go to 20
+c
+c        code for increment not equal to 1
+c
+      nincx = n*incx
+      do 10 i = 1,nincx,incx
+        dx(i) = da*dx(i)
+   10 continue
+      return
+c
+c        code for increment 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
+        dx(i) = da*dx(i)
+   30 continue
+      if( n .lt. 5 ) return
+   40 mp1 = m + 1
+      do 50 i = mp1,n,5
+        dx(i) = da*dx(i)
+        dx(i + 1) = da*dx(i + 1)
+        dx(i + 2) = da*dx(i + 2)
+        dx(i + 3) = da*dx(i + 3)
+        dx(i + 4) = da*dx(i + 4)
+   50 continue
+      return
+      end