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.
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++)
--
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.
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++)
