diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 610536fec66..e86a18dc2b4 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -578,13 +578,16 @@ EmitMachineNode(SDNode *Node, bool IsClone, bool IsCloned,
   const TargetInstrDesc &II = TII->get(Opc);
   unsigned NumResults = CountResults(Node);
   unsigned NodeOperands = CountOperands(Node);
-  bool HasPhysRegOuts = (NumResults > II.getNumDefs()) &&
-                        II.getImplicitDefs() != 0;
+  bool HasPhysRegOuts = NumResults > II.getNumDefs() && II.getImplicitDefs()!=0;
 #ifndef NDEBUG
   unsigned NumMIOperands = NodeOperands + NumResults;
-  assert((II.getNumOperands() == NumMIOperands ||
-          HasPhysRegOuts || II.isVariadic()) &&
-         "#operands for dag node doesn't match .td file!"); 
+  if (II.isVariadic())
+    assert(NumMIOperands >= II.getNumOperands() &&
+           "Too few operands for a variadic node!");
+  else
+    assert(NumMIOperands >= II.getNumOperands() &&
+           NumMIOperands <= II.getNumOperands()+II.getNumImplicitDefs() &&
+           "#operands for dag node doesn't match .td file!");
 #endif
 
   // Create the new machine instruction.
@@ -632,6 +635,18 @@ EmitMachineNode(SDNode *Node, bool IsClone, bool IsCloned,
         MI->addRegisterDead(Reg, TRI);
     }
   }
+  
+  // If the instruction has implicit defs and the node doesn't, mark the
+  // implicit def as dead.  If the node has any flag outputs, we don't do this
+  // because we don't know what implicit defs are being used by flagged nodes.
+  if (Node->getValueType(Node->getNumValues()-1) != MVT::Flag &&
+      // FIXME: This is a terrible hackaround for a liveintervals bug.
+      II.getNumImplicitDefs() < 8)
+    if (const unsigned *IDList = II.getImplicitDefs()) {
+      for (unsigned i = NumResults, e = II.getNumDefs()+II.getNumImplicitDefs();
+           i != e; ++i)
+        MI->addRegisterDead(IDList[i-II.getNumDefs()], TRI);
+    }
   return;
 }
 
diff --git a/test/CodeGen/X86/2007-01-13-StackPtrIndex.ll b/test/CodeGen/X86/2007-01-13-StackPtrIndex.ll
index 5e7c0a7ee2b..a2288986362 100644
--- a/test/CodeGen/X86/2007-01-13-StackPtrIndex.ll
+++ b/test/CodeGen/X86/2007-01-13-StackPtrIndex.ll
@@ -1,5 +1,4 @@
 ; RUN: llc < %s -march=x86-64 > %t
-; RUN: grep leaq %t
 ; RUN: not grep {,%rsp)} %t
 ; PR1103
 
diff --git a/test/CodeGen/X86/2009-02-26-MachineLICMBug.ll b/test/CodeGen/X86/2009-02-26-MachineLICMBug.ll
index a4d642b4035..ae723f0c299 100644
--- a/test/CodeGen/X86/2009-02-26-MachineLICMBug.ll
+++ b/test/CodeGen/X86/2009-02-26-MachineLICMBug.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=x86-64 -mattr=+sse3 -stats |& not grep {machine-licm}
+; RUN: llc < %s -march=x86-64 -mattr=+sse3 -stats |& grep {2 machine-licm}
 ; rdar://6627786
 
 target triple = "x86_64-apple-darwin10.0"
diff --git a/test/CodeGen/X86/coalesce-esp.ll b/test/CodeGen/X86/coalesce-esp.ll
index 0fe4e56c97c..e0f2796f9dc 100644
--- a/test/CodeGen/X86/coalesce-esp.ll
+++ b/test/CodeGen/X86/coalesce-esp.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s | grep {movl	%esp, %eax}
+; RUN: llc < %s | grep {movl	%esp, %ecx}
 ; PR4572
 
 ; Don't coalesce with %esp if it would end up putting %esp in
diff --git a/test/CodeGen/X86/licm-symbol.ll b/test/CodeGen/X86/licm-symbol.ll
index d61bbfccbc9..08306c2950e 100644
--- a/test/CodeGen/X86/licm-symbol.ll
+++ b/test/CodeGen/X86/licm-symbol.ll
@@ -3,7 +3,7 @@
 ; MachineLICM should be able to hoist the sF reference out of the loop.
 
 ; CHECK: pushl %esi
-; CHECK: subl  $8, %esp
+; CHECK: subl  $4, %esp
 ; CHECK: movl  $176, %esi
 ; CHECK: addl  L___sF$non_lazy_ptr, %esi
 ; CHECK: .align  4, 0x90
diff --git a/test/CodeGen/X86/phys_subreg_coalesce-2.ll b/test/CodeGen/X86/phys_subreg_coalesce-2.ll
index 23c509c9936..60ec2645c28 100644
--- a/test/CodeGen/X86/phys_subreg_coalesce-2.ll
+++ b/test/CodeGen/X86/phys_subreg_coalesce-2.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=x86 | grep mov | count 5
+; RUN: llc < %s -march=x86 | grep mov | count 6
 ; PR2659
 
 define i32 @binomial(i32 %n, i32 %k) nounwind {
diff --git a/test/CodeGen/X86/pr2659.ll b/test/CodeGen/X86/pr2659.ll
index 0760e4c7fd5..01bb9f14f64 100644
--- a/test/CodeGen/X86/pr2659.ll
+++ b/test/CodeGen/X86/pr2659.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=x86 -mtriple=i686-apple-darwin9.4.0 | grep movl | count 5
+; RUN: llc < %s -march=x86 -mtriple=i686-apple-darwin9.4.0 | grep movl | count 6
 ; PR2659
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"