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| author | Andrew Lenharth <andrewl@lenharth.org> | 2005-05-03 18:01:48 +0000 |
|---|---|---|
| committer | Andrew Lenharth <andrewl@lenharth.org> | 2005-05-03 18:01:48 +0000 |
| commit | ec370fd3dce3c00cb0a5665cd3e65685325e7d09 (patch) | |
| tree | c851ac37b2477623d4928a91d4118b4d33aa60b1 /docs/LangRef.html | |
| parent | 691ef2ba066dda14ae4ac0ad645054fbc967785a (diff) | |
| download | external_llvm-ec370fd3dce3c00cb0a5665cd3e65685325e7d09.zip external_llvm-ec370fd3dce3c00cb0a5665cd3e65685325e7d09.tar.gz external_llvm-ec370fd3dce3c00cb0a5665cd3e65685325e7d09.tar.bz2 | |
initial descriptions of count intrinsics
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21677 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/LangRef.html')
| -rw-r--r-- | docs/LangRef.html | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index 1e6b3d7..f313aed 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -145,6 +145,13 @@ <li><a href="#i_isunordered">'<tt>llvm.isunordered</tt>' Intrinsic</a></li> </ol> </li> + <li><a href="#int_count">Bit counting Intrinsics</a> + <ol> + <li><a href="#int_ctpop">'<tt>llvm.ctpop</tt>' Intrinsic </a></li> + <li><a href="#int_cttz">'<tt>llvm.cttz</tt>' Intrinsic </a></li> + <li><a href="#int_ctlz">'<tt>llvm.ctlz</tt>' Intrinsic </a></li> + </ol> + </li> <li><a href="#int_debugger">Debugger intrinsics</a></li> </ol> </li> @@ -3029,6 +3036,116 @@ false. </div> +<!-- ======================================================================= --> +<div class="doc_subsection"> + <a name="int_count">Bit Counting Intrinsics</a> +</div> + +<div class="doc_text"> +<p> +LLVM provides intrinsics for a few important bit counting operations. +These allow efficient code generation for some algorithms. +</p> + +</div> + +<!-- _______________________________________________________________________ --> +<div class="doc_subsubsection"> + <a name="int_ctpop">'<tt>llvm.ctpop</tt>' Intrinsic</a> +</div> + +<div class="doc_text"> + +<h5>Syntax:</h5> +<pre> + declare int %llvm.ctpop(int <src>) + +</pre> + +<h5>Overview:</h5> + +<p> +The '<tt>llvm.ctpop</tt>' intrinsic counts the number of ones in a variable. +</p> + +<h5>Arguments:</h5> + +<p> +The only argument is the value to be counted. +</p> + +<h5>Semantics:</h5> + +<p> +The '<tt>llvm.ctpop</tt>' intrinsic counts the 1's in a variable. +</p> +</div> + +<!-- _______________________________________________________________________ --> +<div class="doc_subsubsection"> + <a name="int_cttz">'<tt>llvm.cttz</tt>' Intrinsic</a> +</div> + +<div class="doc_text"> + +<h5>Syntax:</h5> +<pre> + declare int %llvm.cttz(int <src>) + +</pre> + +<h5>Overview:</h5> + +<p> +The '<tt>llvm.cttz</tt>' intrinsic counts the number of trailing zeros. +</p> + +<h5>Arguments:</h5> + +<p> +The only argument is the value to be counted. +</p> + +<h5>Semantics:</h5> + +<p> +The '<tt>llvm.cttz</tt>' intrinsic counts the trailing zeros in a variable. If the src == 0 +then the result is the size in bits of the type of src. +</p> +</div> + +<!-- _______________________________________________________________________ --> +<div class="doc_subsubsection"> + <a name="int_ctlz">'<tt>llvm.ctlz</tt>' Intrinsic</a> +</div> + +<div class="doc_text"> + +<h5>Syntax:</h5> +<pre> + declare int %llvm.ctlz(int <src>) + +</pre> + +<h5>Overview:</h5> + +<p> +The '<tt>llvm.ctlz</tt>' intrinsic counts the number of leading zeros in a variable. +</p> + +<h5>Arguments:</h5> + +<p> +The only argument is the value to be counted. +</p> + +<h5>Semantics:</h5> + +<p> +The '<tt>llvm.ctlz</tt>' intrinsic counts the leading zeros in a variable. If the src == 0 +then the result is the size in bits of the type of src. +</p> +</div> <!-- ======================================================================= --> |