Index: cfe/trunk/lib/CodeGen/CGAtomic.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CGAtomic.cpp
+++ cfe/trunk/lib/CodeGen/CGAtomic.cpp
@@ -1181,7 +1181,7 @@
   if (LVal.isBitField())
     return CGF.EmitLoadOfBitfieldLValue(
         LValue::MakeBitfield(addr, LVal.getBitFieldInfo(), LVal.getType(),
-                             LVal.getAlignmentSource()));
+                             LVal.getAlignmentSource()), loc);
   if (LVal.isVectorElt())
     return CGF.EmitLoadOfLValue(
         LValue::MakeVectorElt(addr, LVal.getVectorIdx(), LVal.getType(),
Index: cfe/trunk/lib/CodeGen/CGExpr.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/CGExpr.cpp
+++ cfe/trunk/lib/CodeGen/CGExpr.cpp
@@ -1549,10 +1549,11 @@
     return EmitLoadOfGlobalRegLValue(LV);
 
   assert(LV.isBitField() && "Unknown LValue type!");
-  return EmitLoadOfBitfieldLValue(LV);
+  return EmitLoadOfBitfieldLValue(LV, Loc);
 }
 
-RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV) {
+RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
+                                                 SourceLocation Loc) {
   const CGBitFieldInfo &Info = LV.getBitFieldInfo();
 
   // Get the output type.
@@ -1577,7 +1578,7 @@
                               "bf.clear");
   }
   Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
-
+  EmitScalarRangeCheck(Val, LV.getType(), Loc);
   return RValue::get(Val);
 }
 
Index: cfe/trunk/lib/CodeGen/CodeGenFunction.h
===================================================================
--- cfe/trunk/lib/CodeGen/CodeGenFunction.h
+++ cfe/trunk/lib/CodeGen/CodeGenFunction.h
@@ -2943,7 +2943,7 @@
   /// rvalue, returning the rvalue.
   RValue EmitLoadOfLValue(LValue V, SourceLocation Loc);
   RValue EmitLoadOfExtVectorElementLValue(LValue V);
-  RValue EmitLoadOfBitfieldLValue(LValue LV);
+  RValue EmitLoadOfBitfieldLValue(LValue LV, SourceLocation Loc);
   RValue EmitLoadOfGlobalRegLValue(LValue LV);
 
   /// EmitStoreThroughLValue - Store the specified rvalue into the specified
Index: cfe/trunk/test/CodeGenCXX/ubsan-bitfields.cpp
===================================================================
--- cfe/trunk/test/CodeGenCXX/ubsan-bitfields.cpp
+++ cfe/trunk/test/CodeGenCXX/ubsan-bitfields.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=enum | FileCheck %s
+
+enum E {
+  a = 1,
+  b = 2,
+  c = 3
+};
+
+struct S {
+  E e1 : 10;
+};
+
+// CHECK-LABEL: define i32 @_Z4loadP1S
+E load(S *s) {
+  // CHECK: [[LOAD:%.*]] = load i16, i16* {{.*}}
+  // CHECK: [[CLEAR:%.*]] = and i16 [[LOAD]], 1023
+  // CHECK: [[CAST:%.*]] = zext i16 [[CLEAR]] to i32
+  // CHECK: icmp ule i32 [[CAST]], 3, !nosanitize
+  // CHECK: call void @__ubsan_handle_load_invalid_value
+  return s->e1;
+}
Index: cfe/trunk/test/CodeGenObjC/ubsan-bool.m
===================================================================
--- cfe/trunk/test/CodeGenObjC/ubsan-bool.m
+++ cfe/trunk/test/CodeGenObjC/ubsan-bool.m
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -x objective-c -emit-llvm -triple x86_64-apple-macosx10.10.0 -fsanitize=bool %s -o - | FileCheck %s -check-prefixes=SHARED,OBJC
-// RUN: %clang_cc1 -x objective-c++ -emit-llvm -triple x86_64-apple-macosx10.10.0 -fsanitize=bool %s -o - | FileCheck %s -check-prefixes=SHARED,OBJC
+// RUN: %clang_cc1 -x objective-c -emit-llvm -triple x86_64-apple-macosx10.10.0 -fsanitize=bool %s -o - -w | FileCheck %s -check-prefixes=SHARED,OBJC
+// RUN: %clang_cc1 -x objective-c++ -emit-llvm -triple x86_64-apple-macosx10.10.0 -fsanitize=bool %s -o - -w | FileCheck %s -check-prefixes=SHARED,OBJC
 // RUN: %clang_cc1 -x c -emit-llvm -triple x86_64-apple-macosx10.10.0 -fsanitize=bool %s -o - | FileCheck %s -check-prefixes=SHARED,C
 
 typedef signed char BOOL;
@@ -10,4 +10,57 @@
   // C-NOT: call void @__ubsan_handle_load_invalid_value
   BOOL a = 2;
   return a + 1;
+  // SHARED: ret i8
 }
+
+struct S1 {
+  BOOL b1 : 1;
+};
+
+// SHARED-LABEL: f2
+BOOL f2(struct S1 *s) {
+  // OBJC: [[LOAD:%.*]] = load i8, i8* {{.*}}
+  // OBJC: [[SHL:%.*]] = shl i8 [[LOAD]], 7
+  // OBJC: [[ASHR:%.*]] = ashr i8 [[SHL]], 7
+  // OBJC: icmp ule i8 [[ASHR]], 1, !nosanitize
+  // OBJC: call void @__ubsan_handle_load_invalid_value
+
+  // C-NOT: call void @__ubsan_handle_load_invalid_value
+  return s->b1;
+  // SHARED: ret i8
+}
+
+#ifdef __OBJC__
+@interface I1 {
+@public
+  BOOL b1 : 1;
+}
+@property (nonatomic) BOOL b1;
+@end
+@implementation I1
+@synthesize b1;
+@end
+
+// Check the synthesized getter.
+// OBJC-LABEL: define internal signext i8 @"\01-[I1 b1]"
+// OBJC: [[IVAR:%.*]] = load i64, i64* @"OBJC_IVAR_$_I1.b1"
+// OBJC: [[ADDR:%.*]] = getelementptr inbounds i8, i8* {{.*}}, i64 [[IVAR]]
+// OBJC: [[LOAD:%.*]] = load i8, i8* {{.*}}
+// OBJC: [[SHL:%.*]] = shl i8 [[LOAD]], 7
+// OBJC: [[ASHR:%.*]] = ashr i8 [[SHL]], 7
+// OBJC: icmp ule i8 [[ASHR]], 1, !nosanitize
+// OBJC: call void @__ubsan_handle_load_invalid_value
+
+// Also check direct accesses to the ivar.
+// OBJC-LABEL: f3
+BOOL f3(I1 *i) {
+  // OBJC: [[LOAD:%.*]] = load i8, i8* {{.*}}
+  // OBJC: [[SHL:%.*]] = shl i8 [[LOAD]], 7
+  // OBJC: [[ASHR:%.*]] = ashr i8 [[SHL]], 7
+  // OBJC: icmp ule i8 [[ASHR]], 1, !nosanitize
+  // OBJC: call void @__ubsan_handle_load_invalid_value
+
+  return i->b1;
+  // OBJC: ret i8
+}
+#endif /* __OBJC__ */