From: Sean Callanan <scallanan@apple.com>
Date: Wed, 2 Feb 2011 01:09:02 +0000 (+0000)
Subject: Fixed a bug in the disassembler where the mandatory 0x66
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=1e1901a2945182b9c53f2ed5c2bd471cebfdf29b;p=oota-llvm.git

Fixed a bug in the disassembler where the mandatory 0x66
prefix would be misinterpreted in some cases on 32-bit
x86 platforms.  Thanks to Olivier Meurant for identifying
the bug.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124709 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
index 7b17f1e5a3a..b6546fc9e86 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
@@ -388,6 +388,7 @@ static int readPrefixes(struct InternalInstruction* insn) {
     }
   } else {
     unconsumeByte(insn);
+    insn->necessaryPrefixLocation = insn->readerCursor - 1;
   }
   
   if (insn->mode == MODE_16BIT) {