From: Dan Gohman <gohman@apple.com>
Date: Mon, 13 Apr 2009 15:13:28 +0000 (+0000)
Subject: Add a comment about MOVSX64rr8.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=04d19f024162031001f3af5eb1113c6c232689a6;p=oota-llvm.git

Add a comment about MOVSX64rr8.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68950 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86Instr64bit.td b/lib/Target/X86/X86Instr64bit.td
index c37a93377ed..10e66e88bee 100644
--- a/lib/Target/X86/X86Instr64bit.td
+++ b/lib/Target/X86/X86Instr64bit.td
@@ -255,6 +255,10 @@ def MOV64mi32 : RIi32<0xC7, MRM0m, (outs), (ins i64mem:$dst, i64i32imm:$src),
 
 // Sign/Zero extenders
 
+// MOVSX64rr8 always has a REX prefix and it has an 8-bit register
+// operand, which makes it a rare instruction with an 8-bit register
+// operand that can never access an h register. If support for h registers
+// were generalized, this would require a special register class.
 def MOVSX64rr8 : RI<0xBE, MRMSrcReg, (outs GR64:$dst), (ins GR8 :$src),
                     "movs{bq|x}\t{$src, $dst|$dst, $src}",
                     [(set GR64:$dst, (sext GR8:$src))]>, TB;