BFieldCache Change the code so as to emit more clang like assembly for gcc

BFieldCache Change the code so as to emit more clang like assembly for gcc

MagneticField/MagFieldElements/MagFieldElements/BFieldCache.icc

@@ -57,7 +57,11 @@ BFieldCache::inside(double z, double r, double phi) const
   if (phi < m_phimin) {
     phi += 2.0 * M_PI;
   }
-  return (z <= m_zmax && z >= m_zmin && r <= m_rmax && r >= m_rmin &&
-          phi <= m_phimax && phi >= m_phimin);
+  // clang emits code that is more similar to using the "bit AND"
+  // rather than "logical AND" for this kind of check.
+  // Basically get rid of jmp instructions with calculating
+  // a bit more
+  return ((z <= m_zmax) & (z >= m_zmin) & (r <= m_rmax) & (r >= m_rmin) &
+          (phi <= m_phimax) & (phi >= m_phimin));
 }