add a note that Nate mentioned last week

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23898 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 31a36b9cfc58907f44e6fb62c8d9972cfbad1c09..354439bfdb0c98e0b14782ef49eb036057af9358 100644 (file)
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -68,3 +68,8 @@ http://gcc.gnu.org/ml/gcc-patches/2004-09/msg01136.html
 
 Another useful one would be  ~0ULL >> X and ~0ULL << X.
 
+//===---------------------------------------------------------------------===//
+
+Should support emission of the bswap instruction, probably by adding a new
+DAG node for byte swapping.  Also useful on PPC which has byte-swapping loads.
+