Index: llvm/lib/Analysis/InstructionSimplify.cpp
===================================================================
--- llvm/lib/Analysis/InstructionSimplify.cpp
+++ llvm/lib/Analysis/InstructionSimplify.cpp
@@ -4563,6 +4563,14 @@
         return TrueVal;
     }
 
+    if (auto *C = dyn_cast<Constant>(FalseVal))
+      if (C->isNullValue()) {
+        // !(X || Y) && X --> false (commuted 2 ways)
+        if (match(Cond, m_Not(m_LogicalOr(m_Value(X), m_Value(Y)))) &&
+            (TrueVal == X || TrueVal == Y))
+          return FalseVal;
+      }
+
     if (match(FalseVal, m_ZeroInt())) {
       // (X || Y) && (X || !Y) --> X (commuted 8 ways)
       if (match(Cond, m_c_LogicalOr(m_Value(X), m_Not(m_Value(Y)))) &&
Index: llvm/test/Transforms/InstSimplify/select-logical.ll
===================================================================
--- llvm/test/Transforms/InstSimplify/select-logical.ll
+++ llvm/test/Transforms/InstSimplify/select-logical.ll
@@ -127,10 +127,7 @@
 
 define i1 @or_not_and(i1 %x, i1 %y) {
 ; CHECK-LABEL: @or_not_and(
-; CHECK-NEXT:    [[L_AND:%.*]] = or i1 [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[L_AND]], true
-; CHECK-NEXT:    [[R:%.*]] = select i1 [[NOT]], i1 [[X]], i1 false
-; CHECK-NEXT:    ret i1 [[R]]
+; CHECK-NEXT:    ret i1 false
 ;
   %l.and = or i1 %x, %y
   %not = xor i1 %l.and, true
@@ -142,10 +139,7 @@
 
 define <2 x i1> @or_not_and_vector(<2 x i1>  %x, <2 x i1>  %y) {
 ; CHECK-LABEL: @or_not_and_vector(
-; CHECK-NEXT:    [[L_AND:%.*]] = or <2 x i1> [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i1> [[L_AND]], <i1 true, i1 true>
-; CHECK-NEXT:    [[R:%.*]] = select <2 x i1> [[NOT]], <2 x i1> [[X]], <2 x i1> zeroinitializer
-; CHECK-NEXT:    ret <2 x i1> [[R]]
+; CHECK-NEXT:    ret <2 x i1> zeroinitializer
 ;
   %l.and = or <2 x i1> %x, %y
   %not = xor <2 x i1> %l.and, <i1 true, i1 true>
@@ -157,10 +151,7 @@
 
 define <2 x i1> @or_not_and_vector_poison1(<2 x i1>  %x, <2 x i1>  %y) {
 ; CHECK-LABEL: @or_not_and_vector_poison1(
-; CHECK-NEXT:    [[L_AND:%.*]] = or <2 x i1> [[X:%.*]], [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i1> [[L_AND]], <i1 poison, i1 true>
-; CHECK-NEXT:    [[R:%.*]] = select <2 x i1> [[NOT]], <2 x i1> [[X]], <2 x i1> zeroinitializer
-; CHECK-NEXT:    ret <2 x i1> [[R]]
+; CHECK-NEXT:    ret <2 x i1> zeroinitializer
 ;
   %l.and = or <2 x i1> %x, %y
   %not = xor <2 x i1> %l.and, <i1 poison, i1 true>
@@ -188,10 +179,7 @@
 
 define i1 @logical_or_not_and(i1 %x, i1 %y) {
 ; CHECK-LABEL: @logical_or_not_and(
-; CHECK-NEXT:    [[L_AND:%.*]] = select i1 [[X:%.*]], i1 true, i1 [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[L_AND]], true
-; CHECK-NEXT:    [[R:%.*]] = select i1 [[NOT]], i1 [[X]], i1 false
-; CHECK-NEXT:    ret i1 [[R]]
+; CHECK-NEXT:    ret i1 false
 ;
   %l.and = select i1 %x, i1 true, i1 %y
   %not = xor i1 %l.and, true
@@ -204,10 +192,7 @@
 
 define i1 @logical_or_not_and_comute_or(i1 %x, i1 %y) {
 ; CHECK-LABEL: @logical_or_not_and_comute_or(
-; CHECK-NEXT:    [[L_AND:%.*]] = select i1 [[X:%.*]], i1 true, i1 [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[L_AND]], true
-; CHECK-NEXT:    [[R:%.*]] = select i1 [[NOT]], i1 [[Y]], i1 false
-; CHECK-NEXT:    ret i1 [[R]]
+; CHECK-NEXT:    ret i1 false
 ;
   %l.and = select i1 %x, i1 true, i1 %y
   %not = xor i1 %l.and, true
@@ -219,10 +204,7 @@
 
 define <3 x i1> @logical_or_not_and_vector1(<3 x i1> %x, <3 x i1> %y) {
 ; CHECK-LABEL: @logical_or_not_and_vector1(
-; CHECK-NEXT:    [[L_AND:%.*]] = select <3 x i1> [[X:%.*]], <3 x i1> <i1 true, i1 true, i1 true>, <3 x i1> [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor <3 x i1> [[L_AND]], <i1 true, i1 true, i1 true>
-; CHECK-NEXT:    [[R:%.*]] = select <3 x i1> [[NOT]], <3 x i1> [[X]], <3 x i1> zeroinitializer
-; CHECK-NEXT:    ret <3 x i1> [[R]]
+; CHECK-NEXT:    ret <3 x i1> zeroinitializer
 ;
   %l.and = select <3 x i1> %x, <3 x i1> <i1 true, i1 true, i1 true>, <3 x i1> %y
   %not = xor <3 x i1> %l.and, <i1 true, i1 true, i1 true>
@@ -230,18 +212,19 @@
   ret <3 x i1> %r
 }
 
+; TODO: this can be false
 ; vector case !(X || Y) && X --> false
 
 define <3 x i1> @logical_or_not_and_vector1_poison1(<3 x i1> %x, <3 x i1> %y) {
 ; CHECK-LABEL: @logical_or_not_and_vector1_poison1(
 ; CHECK-NEXT:    [[L_AND:%.*]] = select <3 x i1> [[X:%.*]], <3 x i1> <i1 true, i1 true, i1 poison>, <3 x i1> [[Y:%.*]]
 ; CHECK-NEXT:    [[NOT:%.*]] = xor <3 x i1> [[L_AND]], <i1 true, i1 true, i1 true>
-; CHECK-NEXT:    [[R:%.*]] = select <3 x i1> [[NOT]], <3 x i1> [[X]], <3 x i1> <i1 true, i1 false, i1 false>
+; CHECK-NEXT:    [[R:%.*]] = select <3 x i1> [[NOT]], <3 x i1> [[X]], <3 x i1> zeroinitializer
 ; CHECK-NEXT:    ret <3 x i1> [[R]]
 ;
   %l.and = select <3 x i1> %x, <3 x i1> <i1 true, i1 true, i1 poison>, <3 x i1> %y
   %not = xor <3 x i1> %l.and, <i1 true, i1 true, i1 true>
-  %r = select <3 x i1> %not, <3 x i1> %x, <3 x i1> <i1 true, i1 false, i1 false>
+  %r = select <3 x i1> %not, <3 x i1> %x, <3 x i1> <i1 false, i1 false, i1 false>
   ret <3 x i1> %r
 }
 
@@ -249,10 +232,7 @@
 
 define <3 x i1> @logical_or_not_and_vector1_poison2(<3 x i1> %x, <3 x i1> %y) {
 ; CHECK-LABEL: @logical_or_not_and_vector1_poison2(
-; CHECK-NEXT:    [[L_AND:%.*]] = select <3 x i1> [[X:%.*]], <3 x i1> <i1 true, i1 true, i1 true>, <3 x i1> [[Y:%.*]]
-; CHECK-NEXT:    [[NOT:%.*]] = xor <3 x i1> [[L_AND]], <i1 true, i1 poison, i1 true>
-; CHECK-NEXT:    [[R:%.*]] = select <3 x i1> [[NOT]], <3 x i1> [[X]], <3 x i1> zeroinitializer
-; CHECK-NEXT:    ret <3 x i1> [[R]]
+; CHECK-NEXT:    ret <3 x i1> zeroinitializer
 ;
   %l.and = select <3 x i1> %x, <3 x i1> <i1 true, i1 true, i1 true>, <3 x i1> %y
   %not = xor <3 x i1> %l.and, <i1 true, i1 poison, i1 true>