docs: document early break support and pragma novector
---
diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index
b4c602a523717c1d64333e44aefb60ba0ed02e7a..aceecb86f17443cfae637e90987427b98c42f6eb
100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -200,6 +200,34 @@ a work-in-progress.</p>
for indicating parameters that are expected to be null-terminated
strings.
</li>
+ <li>
+ The vectorizer now supports vectorizing loops which contain any number of
early breaks.
+ This means loops such as:
+ <pre>
+ 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;
+ }
+ </pre>
+ 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.
+ </li>
</ul>
<!-- .................................................................. -->
<h2 id="languages">New Languages and Language specific improvements</h2>
@@ -231,6 +259,9 @@ a work-in-progress.</p>
previous options <code>-std=c2x</code>, <code>-std=gnu2x</code>
and <code>-Wc11-c2x-compat</code>, which are deprecated but remain
supported.</li>
+ <li>GCC supports a new pragma <code>#pragma GCC novector</code> to
+ indicate to the vectorizer not to vectorize the loop annotated with the
+ pragma.</li>
</ul>
<h3 id="cxx">C++</h3>
@@ -400,6 +431,9 @@ a work-in-progress.</p>
warnings are enabled for C++ as well</li>
<li>The DR 2237 code no longer gives an error, it emits
a <code>-Wtemplate-id-cdtor</code> warning instead</li>
+ <li>GCC supports a new pragma <code>#pragma GCC novector</code> to
+ indicate to the vectorizer not to vectorize the loop annotated with the
+ pragma.</li>
</ul>
<h4 id="libstdcxx">Runtime Library (libstdc++)</h4>
--
diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index b4c602a523717c1d64333e44aefb60ba0ed02e7a..aceecb86f17443cfae637e90987427b98c42f6eb 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -200,6 +200,34 @@ a work-in-progress.</p>
for indicating parameters that are expected to be null-terminated
strings.
</li>
+ <li>
+ The vectorizer now supports vectorizing loops which contain any number of early breaks.
+ This means loops such as:
+ <pre>
+ 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;
+ }
+ </pre>
+ 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.
+ </li>
</ul>
<!-- .................................................................. -->
<h2 id="languages">New Languages and Language specific improvements</h2>
@@ -231,6 +259,9 @@ a work-in-progress.</p>
previous options <code>-std=c2x</code>, <code>-std=gnu2x</code>
and <code>-Wc11-c2x-compat</code>, which are deprecated but remain
supported.</li>
+ <li>GCC supports a new pragma <code>#pragma GCC novector</code> to
+ indicate to the vectorizer not to vectorize the loop annotated with the
+ pragma.</li>
</ul>
<h3 id="cxx">C++</h3>
@@ -400,6 +431,9 @@ a work-in-progress.</p>
warnings are enabled for C++ as well</li>
<li>The DR 2237 code no longer gives an error, it emits
a <code>-Wtemplate-id-cdtor</code> warning instead</li>
+ <li>GCC supports a new pragma <code>#pragma GCC novector</code> to
+ indicate to the vectorizer not to vectorize the loop annotated with the
+ pragma.</li>
</ul>
<h4 id="libstdcxx">Runtime Library (libstdc++)</h4>
