From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 9 Jul 2009 20:50:52 +0000 (+0000)
Subject: Add a Thumb readme entry.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6dded67b0d6262964e22163d0ab37c9ee6957c0a;p=oota-llvm.git

Add a Thumb readme entry.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75173 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/README-Thumb.txt b/lib/Target/ARM/README-Thumb.txt
index 4d3200b445c..ecef58a32da 100644
--- a/lib/Target/ARM/README-Thumb.txt
+++ b/lib/Target/ARM/README-Thumb.txt
@@ -226,3 +226,9 @@ etc. Almost all Thumb instructions clobber condition code.
 //===---------------------------------------------------------------------===//
 
 Add ldmia, stmia support.
+
+//===---------------------------------------------------------------------===//
+
+Thumb load / store address mode offsets are scaled. The values kept in the
+instruction operands are pre-scale values. This probably ought to be changed
+to avoid extra work when we convert Thumb2 instructions to Thumb1 instructions.