From c8ae35a8e8a6a39ae05b1c876afbf404e20961ff Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 8 Sep 2010 05:51:12 +0000
Subject: add support for the commuted form of the test instruction,
 rdar://8018260.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113352 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/AsmParser/X86AsmParser.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib')

diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 90bd4e3d1b..7d62c466b2 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -856,6 +856,16 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
       std::swap(Operands[1], Operands[2]);
     }
 
+  // The assembler accepts "testX <reg>, <mem>" and "testX <mem>, <reg>" as
+  // synonyms.  Our tables only have the "<mem>, <reg>" form, so if we see the
+  // other operand order, swap them.
+  if (Name == "testb" || Name == "testw" || Name == "testl" || Name == "testq")
+    if (Operands.size() == 3 &&
+        static_cast<X86Operand*>(Operands[1])->isReg() &&
+        static_cast<X86Operand*>(Operands[2])->isMem()) {
+      std::swap(Operands[1], Operands[2]);
+    }
+  
   return false;
 }
 
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