Add an entry

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26520 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index c85477c1a684068da389182ed419007db77bb14b..e1bceb1b8f75aec733fc3c2810d86f6fafd27127 100644 (file)
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -533,3 +533,8 @@ as opposed to what llc is currently generating:
        imull $9, 4(%esp), %eax
 
 Currently the load folding imull has a higher complexity than the LEA32 pattern.
+
+//===---------------------------------------------------------------------===//
+
+Lower memcpy / memset to a series of SSE 128 bit move instructions when it's
+feasible.