From: Duncan Sands <baldrick@free.fr>
Date: Tue, 23 Nov 2010 10:50:08 +0000 (+0000)
Subject: Expand a little on the description of what InstructionSimplify does.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=4cd2ad15b43f21d641330b4b09961af08646445e;p=oota-llvm.git

Expand a little on the description of what InstructionSimplify does.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120016 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Analysis/InstructionSimplify.h b/include/llvm/Analysis/InstructionSimplify.h
index f88fc46c311..8f9b45b3c87 100644
--- a/include/llvm/Analysis/InstructionSimplify.h
+++ b/include/llvm/Analysis/InstructionSimplify.h
@@ -7,9 +7,11 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file declares routines for folding instructions into simpler forms that
-// do not require creating new instructions.  For example, this does constant
-// folding, and can handle identities like (X&0)->0.
+// This file declares routines for folding instructions into simpler forms
+// that do not require creating new instructions.  This does constant folding
+// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
+// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
+// ("and i32 %x, %x" -> "%x").
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
index 4b6320bb46a..ac21a9ae20b 100644
--- a/lib/Analysis/InstructionSimplify.cpp
+++ b/lib/Analysis/InstructionSimplify.cpp
@@ -8,8 +8,10 @@
 //===----------------------------------------------------------------------===//
 //
 // This file implements routines for folding instructions into simpler forms
-// that do not require creating new instructions.  For example, this does
-// constant folding, and can handle identities like (X&0)->0.
+// that do not require creating new instructions.  This does constant folding
+// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
+// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
+// ("and i32 %x, %x" -> "%x").
 //
 //===----------------------------------------------------------------------===//