Implement signbit function for integer vectors

1 files changed, 13 insertions, 0 deletions

diff --git a/vec_pseudo.h b/vec_pseudo.h
index 3bacd9d..09de4a5 100644
--- a/vec_pseudo.h
+++ b/vec_pseudo.h
@@ -355,6 +355,13 @@ namespace vecmathlib {
     
     
     
+    boolvec_t signbit() const
+    {
+      boolvec_t res;
+      for (int d=0; d<size; ++d) res.set_elt(d, v[d] < 0);
+      return res;
+    }
+    
     boolvec_t operator==(intpseudovec const& x) const
     {
       boolvec_t res;
@@ -918,6 +925,12 @@ namespace vecmathlib {
     return x.lsr(n);
   }
   
+  template<typename real_t, int size>
+  inline boolpseudovec<real_t, size> signbit(intpseudovec<real_t, size> x)
+  {
+    return x.signbit();
+  }
+  
   
   
   // realpseudovec wrappers