From: Andrew Trick <atrick@apple.com>
Date: Mon, 30 Jul 2012 23:48:14 +0000 (+0000)
Subject: Added MachineRegisterInfo::hasOneDef()
X-Git-Tag: android-x86-6.0-r1~179^2~4307
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=0492a8c530df6c7b2ebcfa91fed930c1a1bf664d;p=android-x86%2Fexternal-llvm.git

Added MachineRegisterInfo::hasOneDef()

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161009 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index 1c2baef8bce..061d60a23ef 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -172,6 +172,15 @@ public:
   /// specified register (it may be live-in).
   bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); }
 
+  /// hasOneDef - Return true if there is exactly one instruction defining the
+  /// specified register.
+  bool hasOneDef(unsigned RegNo) const {
+    def_iterator DI = def_begin(RegNo);
+    if (DI == def_end())
+      return false;
+    return ++DI == def_end();
+  }
+
   /// use_iterator/use_begin/use_end - Walk all uses of the specified register.
   typedef defusechain_iterator<true,false,false> use_iterator;
   use_iterator use_begin(unsigned RegNo) const {