-most intrinsics, it makes sense to add code to lower your intrinsic in
-<tt>LowerIntrinsicCall</tt> in <tt>lib/CodeGen/IntrinsicLowering.cpp</tt>.
-Second, if it makes sense to lower the intrinsic to an expanded sequence of C
-code in all cases, just emit the expansion in <tt>visitCallInst</tt> in
-<tt>Writer.cpp</tt>. If the intrinsic has some way to express it with GCC
-(or any other compiler) extensions, it can be conditionally supported based on
-the compiler compiling the CBE output (see <tt>llvm.prefetch</tt> for an
-example).
-Third, if the intrinsic really has no way to be lowered, just have the code
-generator emit code that prints an error message and calls abort if executed.
-</dd>
-
-<dl>
-<dt>Add support to the SelectionDAG Instruction Selector in
-<tt>lib/CodeGen/SelectionDAG/</tt></dt>
-
-<dd>Since most targets in LLVM use the SelectionDAG framework for generating
-code, you will likely need to add support for your intrinsic there as well.
-This is usually accomplished by adding a new node, and then teaching the
-SelectionDAG code how to handle that node. To do this, follow the steps in
-the <a href="#sdnode">Adding a new SelectionDAG node</a> section.</dd>
-
-<dl>
-<dt>Once you have added the new node, add code to
-<tt>SelectionDAG/SelectionDAGISel.cpp</tt> to recognize the intrinsic. In most
-cases, the intrinsic will just be turned into the node you just added. For an
-example of this, see how <tt>visitIntrinsicCall</tt> handles
-<tt>Intrinsic::ctpop_*</tt>.
-</dt>
+ most intrinsics, it makes sense to add code to lower your intrinsic in
+ <tt>LowerIntrinsicCall</tt> in <tt>lib/CodeGen/IntrinsicLowering.cpp</tt>.
+ Second, if it makes sense to lower the intrinsic to an expanded sequence of
+ C code in all cases, just emit the expansion in <tt>visitCallInst</tt> in
+ <tt>Writer.cpp</tt>. If the intrinsic has some way to express it with GCC
+ (or any other compiler) extensions, it can be conditionally supported based
+ on the compiler compiling the CBE output (see <tt>llvm.prefetch</tt> for an
+ example). Third, if the intrinsic really has no way to be lowered, just
+ have the code generator emit code that prints an error message and calls
+ abort if executed.</dd>
+
+<dt>Add support to the .td file for the target(s) of your choice in
+ <tt>lib/Target/*/*.td</tt>.</dt>
+
+<dd>This is usually a matter of adding a pattern to the .td file that matches
+ the intrinsic, though it may obviously require adding the instructions you
+ want to generate as well. There are lots of examples in the PowerPC and X86
+ backend to follow.</dd>
+</dl>