Author: meheff
Date: Mon Jul 13 13:31:37 2015
New Revision: 242048
URL: http://llvm.org/viewvc/llvm-project?rev=242048&view=rev
Log:
Update documentation for unroll pragmas on loops with runtime trip counts.
This change updates the documentation for the loop unrolling pragma behavior
change in r242047. Specifically, with that change "#pragma unroll" will not
unroll loops with a runtime trip count.
Modified:
cfe/trunk/docs/LanguageExtensions.rst
Modified: cfe/trunk/docs/LanguageExtensions.rst
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/LanguageExtensions.rst?rev=242048&r1=242047&r2=242048&view=diff
==============================================================================
--- cfe/trunk/docs/LanguageExtensions.rst (original)
+++ cfe/trunk/docs/LanguageExtensions.rst Mon Jul 13 13:31:37 2015
@@ -1991,10 +1991,10 @@ compile time. Partial unrolling replicat
reduces the trip count.
If ``unroll(full)`` is specified the unroller will attempt to fully unroll the
-loop if the trip count is known at compile time. If the loop count is not known
-or the fully unrolled code size is greater than the limit specified by the
-`-pragma-unroll-threshold` command line option the loop will be partially
-unrolled subject to the same limit.
+loop if the trip count is known at compile time. If the fully unrolled code
size
+is greater than an internal limit the loop will be partially unrolled up to
this
+limit. If the loop count is not known at compile time the loop will not be
+unrolled.
.. code-block:: c++
@@ -2006,7 +2006,7 @@ unrolled subject to the same limit.
The unroll count can be specified explicitly with ``unroll_count(_value_)``
where
_value_ is a positive integer. If this value is greater than the trip count the
loop will be fully unrolled. Otherwise the loop is partially unrolled subject
-to the `-pragma-unroll-threshold` limit.
+to the same code size limit as with ``unroll(full)``.
.. code-block:: c++
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