1 files changed, 8 insertions, 1 deletions
diff --git a/vec_mask.h b/vec_mask.h
index 75e5db9..31538b0 100644
--- a/vec_mask.h
+++ b/vec_mask.h
@@ -43,8 +43,15 @@ namespace vecmathlib {
     
     // Construct a mask for a loop starting at imin, aligned down
     mask_t(std::ptrdiff_t imin_, std::ptrdiff_t imax_, std::ptrdiff_t ioff):
-      mask_t(imin_ - (ioff + imin_) % size, imin_, imax_, ioff)
+      imin(imin_), imax(imax_), i(imin_ - (ioff + imin_) % size)
     {
+      all_m = i-imin >= 0 && i+size-1-imax < 0;
+      if (__builtin_expect(all_m, true)) {
+        m = true;
+      } else {
+        m = (! signbit(intvec_t(i          - imin) + intvec_t::iota()) &&
+               signbit(intvec_t(i + size-1 - imax) + intvec_t::iota()));
+      }
     }
     
     // Get current index