From: Chris Lattner <sabre@nondot.org>
Date: Mon, 24 Dec 2007 19:27:46 +0000 (+0000)
Subject: add a simple hack
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=44cb8efdc19207fdb12c261821fbcb0516b8bcbd;p=oota-llvm.git

add a simple hack



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45343 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 8effd47766b..ad15b14f166 100644
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -1573,3 +1573,15 @@ _test:
 
 //===---------------------------------------------------------------------===//
 
+We can fold a store into "zeroing a reg".  Instead of:
+
+xorl    %eax, %eax
+movl    %eax, 124(%esp)
+
+we should get:
+
+movl    $0, 124(%esp)
+
+if the flags of the xor are dead.
+
+//===---------------------------------------------------------------------===//