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for indicating parameters that are expected to be null-terminated strings. +
  • + The vectorizer now supports vectorizing loops which contain any number of early breaks. + This means loops such as: + 
    +	int z[100], y[100], x[100];
+	int foo (int n)
+	{
+	  int res = 0;
+	  for (int i = 0; i < n; i++)
+	    {
+	       y[i] = x[i] * 2;
+	       res += x[i] + y[i];
+
+	       if (x[i] > 5)
+		 break;
+
+	       if (z[i] > 5)
+		 break;
+
+	    }
+	  return res;
+	}
+
    + can now be vectorized on a number of targets. In this first version any + input data sources must either have a statically known size at compile time + or the vectorizer must be able to determine based on auxillary information + that the accesses are aligned. +

    • New Languages and Language specific improvements

    @@ -231,6 +259,9 @@ a work-in-progress.

    previous options -std=c2x, -std=gnu2x and -Wc11-c2x-compat, which are deprecated but remain supported. +
  • GCC supports a new pragma #pragma GCC novector to + indicate to the vectorizer not to vectorize the loop annotated with the + pragma.

    • C++

    @@ -400,6 +431,9 @@ a work-in-progress.

    warnings are enabled for C++ as well
  • The DR 2237 code no longer gives an error, it emits a -Wtemplate-id-cdtor warning instead
    • +
  • GCC supports a new pragma #pragma GCC novector to + indicate to the vectorizer not to vectorize the loop annotated with the + pragma.

    • Runtime Library (libstdc++)