1 files changed, 48 insertions, 0 deletions
diff --git a/2.3-1/src/fortran/blas/daxpy.f b/2.3-1/src/fortran/blas/daxpy.f
new file mode 100644
index 00000000..91daa3c6
--- /dev/null
+++ b/2.3-1/src/fortran/blas/daxpy.f
@@ -0,0 +1,48 @@
+      subroutine daxpy(n,da,dx,incx,dy,incy)
+c
+c     constant times a vector plus a vector.
+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(*),da
+      integer i,incx,incy,ix,iy,m,mp1,n
+c
+      if(n.le.0)return
+      if (da .eq. 0.0d0) 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
+        dy(iy) = dy(iy) + da*dx(ix)
+        ix = ix + incx
+        iy = iy + incy
+   10 continue
+      return
+c
+c        code for both increments equal to 1
+c
+c
+c        clean-up loop
+c
+   20 m = mod(n,4)
+      if( m .eq. 0 ) go to 40
+      do 30 i = 1,m
+        dy(i) = dy(i) + da*dx(i)
+   30 continue
+      if( n .lt. 4 ) return
+   40 mp1 = m + 1
+      do 50 i = mp1,n,4
+        dy(i) = dy(i) + da*dx(i)
+        dy(i + 1) = dy(i + 1) + da*dx(i + 1)
+        dy(i + 2) = dy(i + 2) + da*dx(i + 2)
+        dy(i + 3) = dy(i + 3) + da*dx(i + 3)
+   50 continue
+      return
+      end