Changes in directory llvm/docs:
LangRef.html updated: 1.116 -> 1.117
---
Log message:
continued readcyclecounter support
---
Diffs of the changes: (+35 -1)
LangRef.html | 36 +++++++++++++++++++++++++++++++++++-
1 files changed, 35 insertions(+), 1 deletion(-)
Index: llvm/docs/LangRef.html
diff -u llvm/docs/LangRef.html:1.116 llvm/docs/LangRef.html:1.117
--- llvm/docs/LangRef.html:1.116 Thu Nov 10 20:15:27 2005
+++ llvm/docs/LangRef.html Fri Nov 11 10:46:55 2005
@@ -128,6 +128,7 @@
<li><a href="#i_frameaddress">'<tt>llvm.frameaddress</tt>'
Intrinsic</a></li>
<li><a href="#i_prefetch">'<tt>llvm.prefetch</tt>' Intrinsic</a></li>
<li><a href="#i_pcmarker">'<tt>llvm.pcmarker</tt>' Intrinsic</a></li>
+ <li><a href="#i_readcyclecounter"><tt>llvm.readcyclecounter</tt>'
Intrinsic</a></li>
</ol>
</li>
<li><a href="#int_os">Operating System Intrinsics</a>
@@ -2811,6 +2812,39 @@
</div>
+<!-- _______________________________________________________________________
-->
+<div class="doc_subsubsection">
+ <a name="i_readcyclecounter">'<tt>llvm.readcyclecounter</tt>' Intrinsic</a>
+</div>
+
+<div class="doc_text">
+
+<h5>Syntax:</h5>
+<pre>
+ declare ulong %llvm.readcyclecounter( )
+</pre>
+
+<h5>Overview:</h5>
+
+
+<p>
+The '<tt>llvm.readcyclecounter</tt>' intrinsic provides access to the cycle
+counter register (or similar low latency, high accuracy clocks) on those
targets
+that support it. On X86, it should map to RDTSC. On Alpha, it should map to
RPCC.
+As the backing counters overflow quickly (on the order of 9 seconds on alpha),
this
+should only be used for small timings.
+</p>
+
+<h5>Semantics:</h5>
+
+<p>
+When directly supported, reading the cycle counter should not modify any
memory.
+Implementations are allowed to either return a application specific value or a
+system wide value. On backends without support, this is lowered to a constant
0.
+</p>
+
+</div>
+
<!-- =======================================================================
-->
<div class="doc_subsection">
@@ -3388,7 +3422,7 @@
<a href="mailto:[EMAIL PROTECTED]">Chris Lattner</a><br>
<a href="http://llvm.cs.uiuc.edu";>The LLVM Compiler Infrastructure</a><br>
- Last modified: $Date: 2005/11/11 02:15:27 $
+ Last modified: $Date: 2005/11/11 16:46:55 $
</address>
</body>
</html>
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
