New entry

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27697 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index f58991728ea61c8feace00ac8b0ec74fc6bf0d87..de768b08132a84515523c79fc44220ef05ea52f1 100644 (file)
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -810,3 +810,8 @@ destination?
 How about andps, andpd, and pand? Do we really care about the type of the packed
 elements? If not, why not always use the "ps" variants which are likely to be
 shorter.
+
+//===---------------------------------------------------------------------===//
+
+Make sure XMM registers are spilled to 128-bit locations (if not already) and
+add vector SSE opcodes to X86RegisterInfo::foldMemoryOperand().