[lib/Fuzzer] build tests that work well with dfsan also w/o dfsan

[oota-llvm.git] / docs / BitSets.rst

diff --git a/docs/BitSets.rst b/docs/BitSets.rst
index a65f421210f22d27115f95cf64289dadf1324cb4..c6ffdbdb8a11986fb1edc7377907a4f3ce9161d9 100644 (file)
--- a/docs/BitSets.rst
+++ b/docs/BitSets.rst
@@ -17,8 +17,10 @@ global variable.
 This will cause a link-time optimization pass to generate bitsets from the
 memory addresses referenced from the elements of the bitset metadata. The pass
 will lay out the referenced globals consecutively, so their definitions must
-be available at LTO time. An intrinsic, :ref:`llvm.bitset.test <bitset.test>`,
-generates code to test whether a given pointer is a member of a bitset.
+be available at LTO time. The `GlobalLayoutBuilder`_ class is responsible for
+laying out the globals efficiently to minimize the sizes of the underlying
+bitsets. An intrinsic, :ref:`llvm.bitset.test <bitset.test>`, generates code
+to test whether a given pointer is a member of a bitset.
 
 :Example:
 
@@ -64,3 +66,5 @@ generates code to test whether a given pointer is a member of a bitset.
       %d12 = call i1 @bar(i32* getelementptr ([2 x i32]* @d, i32 0, i32 1)) ; returns 1
       ret void
     }
+
+.. _GlobalLayoutBuilder: http://llvm.org/klaus/llvm/blob/master/include/llvm/Transforms/IPO/LowerBitSets.h