From 46f1a8797cfc9ff2a64438060deaed5e8f1f9a6b Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 20 Dec 2007 04:47:44 +0000
Subject: [PATCH] Add m_Zero().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45255 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/PatternMatch.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/llvm/Support/PatternMatch.h b/include/llvm/Support/PatternMatch.h
index 6b295d64821..e046b29122c 100644
--- a/include/llvm/Support/PatternMatch.h
+++ b/include/llvm/Support/PatternMatch.h
@@ -46,9 +46,24 @@ struct leaf_ty {
   bool match(ITy *V) { return isa<Class>(V); }
 };
 
+/// m_Value() - Match an arbitrary value and ignore it.
 inline leaf_ty<Value> m_Value() { return leaf_ty<Value>(); }
+/// m_ConstantInt() - Match an arbitrary ConstantInt and ignore it.
 inline leaf_ty<ConstantInt> m_ConstantInt() { return leaf_ty<ConstantInt>(); }
 
+struct zero_ty {
+  template<typename ITy>
+  bool match(ITy *V) {
+    if (const Constant *C = dyn_cast<Constant>(V))
+      return C->isNullValue();
+    return false;
+  }
+};
+
+/// m_Zero() - Match an arbitrary zero/null constant.
+inline zero_ty m_Zero() { return zero_ty(); }
+
+
 template<typename Class>
 struct bind_ty {
   Class *&VR;
@@ -64,7 +79,10 @@ struct bind_ty {
   }
 };
 
+/// m_Value - Match a value, capturing it if we match.
 inline bind_ty<Value> m_Value(Value *&V) { return V; }
+
+/// m_ConstantInt - Match a ConstantInt, capturing the value if we match.
 inline bind_ty<ConstantInt> m_ConstantInt(ConstantInt *&CI) { return CI; }
 
 //===----------------------------------------------------------------------===//
-- 
2.11.0