A new entry.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28848 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index b8db3ab94e1f22d7bf467f4d415bf50131d1fbbe..5789754439aaa3020c525132740fd2fde6ece37a 100644 (file)
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -702,3 +702,5 @@ L2:
 Smells like a register coallescing/reassociation issue.
 
 //===---------------------------------------------------------------------===//
+
+Use cpuid to auto-detect CPU features such as SSE, SSE2, and SSE3.