From: Chris Lattner <sabre@nondot.org>
Date: Tue, 18 Dec 2007 16:48:14 +0000 (+0000)
Subject: add an obvious load folding missed optzn.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=4185b52183bd0269258ac5e28ad34f145609209d;p=oota-llvm.git

add an obvious load folding missed optzn.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45161 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt
index 7705c1ba31e..8effd47766b 100644
--- a/lib/Target/X86/README.txt
+++ b/lib/Target/X86/README.txt
@@ -1552,3 +1552,24 @@ _foo:
         andl    $65535, %eax
         ret
 
+//===---------------------------------------------------------------------===//
+
+We're missing an obvious fold of a load into imul:
+
+int test(long a, long b) { return a * b; } 
+
+LLVM produces:
+_test:
+        movl    4(%esp), %ecx
+        movl    8(%esp), %eax
+        imull   %ecx, %eax
+        ret
+
+vs:
+_test:
+        movl    8(%esp), %eax
+        imull   4(%esp), %eax
+        ret
+
+//===---------------------------------------------------------------------===//
+