Index: lib/Analysis/InstructionSimplify.cpp
===================================================================
--- lib/Analysis/InstructionSimplify.cpp
+++ lib/Analysis/InstructionSimplify.cpp
@@ -65,13 +65,21 @@
 static Value *SimplifyGEPInst(Type *, ArrayRef<Value *>, const SimplifyQuery &,
                               unsigned);
 
-/// Fold
-///   %A = icmp ne/eq i8 %X, %V1
-///   %B = icmp ne/eq i8 %X, %V2
-///   %C = or/and i1 %A, %B
-///   %D = select i1 %C, i8 %X, i8 %V1
-/// To
-///   %X/%V1
+// Fold
+//   %A = icmp ne/eq i8 %X, %V1
+//   %B = icmp ne/eq i8 %X, %V2
+//   %C = or/and i1 %A, %B
+//   %D = select i1 %C, i8 %X, i8 %V1
+// To
+//   %X/%V1
+//
+// Fold
+//   %A = icmp ne/eq i8 %X, %Z
+//   %B = icmp ne/eq i8 %Y, %Z
+//   %C = or/and i1 %A, %B
+//   %D = select i1 %C, i8 %X, i8 %Z
+// To
+//   %X
 static Value *foldSelectWithBinaryOp(Value *Cond, Value *TrueVal,
                                      Value *FalseVal) {
   BinaryOperator::BinaryOps BinOpCode;
@@ -89,14 +97,17 @@
     return nullptr;
 
   CmpInst::Predicate Pred1, Pred2;
-  if (!match(
-          Cond,
-          m_c_BinOp(m_c_ICmp(Pred1, m_Specific(TrueVal), m_Specific(FalseVal)),
-                    m_c_ICmp(Pred2, m_Specific(TrueVal), m_Value()))) ||
+  Value *V, *Z;
+  if (!match(Cond, m_c_BinOp(m_c_ICmp(Pred1, m_Specific(TrueVal),
+                                      m_Specific(FalseVal)),
+                             m_c_ICmp(Pred2, m_Value(V), m_Value(Z)))) ||
       Pred1 != Pred2 || Pred1 != ExpectedPred)
     return nullptr;
 
-  return BinOpCode == BinaryOperator::Or ? TrueVal : FalseVal;
+  if (V == TrueVal || V == FalseVal || Z == TrueVal || Z == FalseVal)
+    return BinOpCode == BinaryOperator::Or ? TrueVal : FalseVal;
+
+  return nullptr;
 }
 
 /// For a boolean type or a vector of boolean type, return false or a vector
@@ -5119,4 +5130,4 @@
 }
 template const SimplifyQuery getBestSimplifyQuery(AnalysisManager<Function> &,
                                                   Function &);
-}
+}
Index: test/Transforms/InstSimplify/select-and-cmp.ll
===================================================================
--- test/Transforms/InstSimplify/select-and-cmp.ll
+++ test/Transforms/InstSimplify/select-and-cmp.ll
@@ -36,11 +36,7 @@
 
 define i32 @select_and_icmp_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_and_icmp_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = and i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[Z:%.*]]
 ;
   %A = icmp eq i32 %x, %z
   %B = icmp eq i32 %y, %z
@@ -51,11 +47,7 @@
 
 define i32 @select_and_icmp_alt2(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_and_icmp_alt2(
-; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = and i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[Y]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[Z:%.*]]
 ;
   %A = icmp eq i32 %x, %z
   %B = icmp eq i32 %y, %z
@@ -66,11 +58,7 @@
 
 define i32 @select_and_icmp_inv_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_and_icmp_inv_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[Z:%.*]], [[X:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp eq i32 [[Z]], [[Y:%.*]]
-; CHECK-NEXT:    [[C:%.*]] = and i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[Z:%.*]]
 ;
   %A = icmp eq i32 %z, %x
   %B = icmp eq i32 %z, %y
@@ -81,11 +69,7 @@
 
 define i32 @select_and_inv_icmp_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_and_inv_icmp_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = and i1 [[B]], [[A]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[Z:%.*]]
 ;
   %A = icmp eq i32 %x, %z
   %B = icmp eq i32 %y, %z
@@ -107,11 +91,7 @@
 
 define <2 x i8> @select_and_icmp_alt_vec(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
 ; CHECK-LABEL: @select_and_icmp_alt_vec(
-; CHECK-NEXT:    [[A:%.*]] = icmp eq <2 x i8> [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp eq <2 x i8> [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = and <2 x i1> [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select <2 x i1> [[C]], <2 x i8> [[X]], <2 x i8> [[Z]]
-; CHECK-NEXT:    ret <2 x i8> [[D]]
+; CHECK-NEXT:    ret <2 x i8> [[Z:%.*]]
 ;
   %A = icmp eq <2 x i8> %x, %z
   %B = icmp eq <2 x i8> %y, %z
Index: test/Transforms/InstSimplify/select-or-cmp.ll
===================================================================
--- test/Transforms/InstSimplify/select-or-cmp.ll
+++ test/Transforms/InstSimplify/select-or-cmp.ll
@@ -36,11 +36,7 @@
 
 define i32 @select_or_icmp_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_or_icmp_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp ne i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = or i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[X:%.*]]
 ;
   %A = icmp ne i32 %x, %z
   %B = icmp ne i32 %y, %z
@@ -51,11 +47,7 @@
 
 define i32 @select_or_icmp_alt2(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_or_icmp_alt2(
-; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp ne i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = or i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[Y]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[Y:%.*]]
 ;
   %A = icmp ne i32 %x, %z
   %B = icmp ne i32 %y, %z
@@ -66,11 +58,7 @@
 
 define i32 @select_or_icmp_inv_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_or_icmp_inv_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[Z:%.*]], [[X:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp ne i32 [[Z]], [[Y:%.*]]
-; CHECK-NEXT:    [[C:%.*]] = or i1 [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[X:%.*]]
 ;
   %A = icmp ne i32 %z, %x
   %B = icmp ne i32 %z, %y
@@ -81,11 +69,7 @@
 
 define i32 @select_or_inv_icmp_alt(i32 %x, i32 %y, i32 %z) {
 ; CHECK-LABEL: @select_or_inv_icmp_alt(
-; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[Z:%.*]], [[X:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp ne i32 [[Z]], [[Y:%.*]]
-; CHECK-NEXT:    [[C:%.*]] = or i1 [[B]], [[A]]
-; CHECK-NEXT:    [[D:%.*]] = select i1 [[C]], i32 [[X]], i32 [[Z]]
-; CHECK-NEXT:    ret i32 [[D]]
+; CHECK-NEXT:    ret i32 [[X:%.*]]
 ;
   %A = icmp ne i32 %z, %x
   %B = icmp ne i32 %z, %y
@@ -96,11 +80,7 @@
 
 define <2 x i8> @select_or_icmp_alt_vec(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
 ; CHECK-LABEL: @select_or_icmp_alt_vec(
-; CHECK-NEXT:    [[A:%.*]] = icmp ne <2 x i8> [[X:%.*]], [[Z:%.*]]
-; CHECK-NEXT:    [[B:%.*]] = icmp ne <2 x i8> [[Y:%.*]], [[Z]]
-; CHECK-NEXT:    [[C:%.*]] = or <2 x i1> [[A]], [[B]]
-; CHECK-NEXT:    [[D:%.*]] = select <2 x i1> [[C]], <2 x i8> [[X]], <2 x i8> [[Z]]
-; CHECK-NEXT:    ret <2 x i8> [[D]]
+; CHECK-NEXT:    ret <2 x i8> [[X:%.*]]
 ;
   %A = icmp ne <2 x i8> %x, %z
   %B = icmp ne <2 x i8> %y, %z