From e66b7ebfb426c7ed9bc911e9708321e2d8510b41 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 1 Nov 2010 23:57:23 +0000
Subject: [PATCH] fix computation of ambiguous instructions to not ignore the
 mnemonic. FWIW, X86 has 254 ambiguous instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117979 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/AsmMatcherEmitter.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/utils/TableGen/AsmMatcherEmitter.cpp b/utils/TableGen/AsmMatcherEmitter.cpp
index 7f653a3f7d9..532a7b5f175 100644
--- a/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/utils/TableGen/AsmMatcherEmitter.cpp
@@ -411,6 +411,10 @@ struct MatchableInfo {
   /// ambiguously match the same set of operands as \arg RHS (without being a
   /// strictly superior match).
   bool CouldMatchAmiguouslyWith(const MatchableInfo &RHS) {
+    // The primary comparator is the instruction mnemonic.
+    if (Tokens[0] != RHS.Tokens[0])
+      return false;
+    
     // The number of operands is unambiguous.
     if (Operands.size() != RHS.Operands.size())
       return false;
@@ -849,8 +853,8 @@ BuildRegisterClasses(SmallPtrSet<Record*, 16> &SingletonRegisters) {
 }
 
 void AsmMatcherInfo::BuildOperandClasses() {
-  std::vector<Record*> AsmOperands;
-  AsmOperands = Records.getAllDerivedDefinitions("AsmOperandClass");
+  std::vector<Record*> AsmOperands =
+    Records.getAllDerivedDefinitions("AsmOperandClass");
 
   // Pre-populate AsmOperandClasses map.
   for (std::vector<Record*>::iterator it = AsmOperands.begin(),
@@ -1127,7 +1131,7 @@ static void EmitConvertToMCInst(CodeGenTarget &Target,
       }
     }
 
-    std::sort(MIOperandList.begin(), MIOperandList.end());
+    array_pod_sort(MIOperandList.begin(), MIOperandList.end());
 
     // Compute the total number of operands.
     unsigned NumMIOperands = 0;