Ref #740: updated asum_vfp.S and iamax_vfp.S

kernel/arm/asum_vfp.S

@@ -367,12 +367,12 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 	.align 5
 
-#if defined(DOUBLE)
-	vsub.f64                d0 , d0 , d0
-	vsub.f64                d1 , d1 , d1
-#else
-	vsub.f32                s0 , s0 , s0
-	vsub.f32                s1 , s1 , s1
+        movs    r12, #0                                          // clear floating point register
+        vmov    s0, r12
+        vmov    s1, r12
+#if     defined(DOUBLE)
+        vcvt.f64.f32    d0, s0
+        vcvt.f64.f32    d1, s1
 #endif
 
 	cmp	N, #0

kernel/arm/iamax_vfp.S

@@ -341,11 +341,12 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 	.align 5
 	push    {r4}
 
-#if defined(DOUBLE)
-	vsub.f64                d0 , d0 , d0
-#else
-	vsub.f32                s0 , s0 , s0
+        movs    r12, #0                                          // clear floating point register
+        vmov    s0, r12
+#if     defined(DOUBLE)
+        vcvt.f64.f32    d0, s0
 #endif
+
 	mov	INDEX, #0
 
 	cmp	N, #0