From: Craig Topper <craig.topper@gmail.com>
Date: Sat, 4 Apr 2015 02:31:43 +0000 (+0000)
Subject: [X86] Add a comment about the change in r234075.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3d44178733c451f12075b6527580db10ce11c50d;p=platform%2Fupstream%2Fllvm.git

[X86] Add a comment about the change in r234075.

llvm-svn: 234079
---

diff --git a/llvm/lib/Target/X86/X86InstrCompiler.td b/llvm/lib/Target/X86/X86InstrCompiler.td
index e7de24b..227f69a 100644
--- a/llvm/lib/Target/X86/X86InstrCompiler.td
+++ b/llvm/lib/Target/X86/X86InstrCompiler.td
@@ -1232,6 +1232,8 @@ def : Pat<(store (add (loadi64 addr:$dst), 0x00000000800000000), addr:$dst),
 // with implicit zero-extension instead of a 64-bit and if the immediate has at
 // least 32 bits of leading zeros. If in addition the last 32 bits can be
 // represented with a sign extension of a 8 bit constant, use that.
+// This can also reduce instruction size by eliminating the need for the REX
+// prefix.
 
 let AddedComplexity = 1 in // Give priority over i64immSExt8.
 def : Pat<(and GR64:$src, i64immZExt32SExt8:$imm),