--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/llvm/test/Transforms/Reassociate/inverses.ll	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,62 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -reassociate -die -S | FileCheck %s
+
+; (A&B)&~A == 0
+define i32 @test1(i32 %a, i32 %b) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret i32 0
+;
+  %t2 = and i32 %b, %a
+  %t4 = xor i32 %a, -1
+  %t5 = and i32 %t2, %t4
+  ret i32 %t5
+}
+
+define <2 x i32> @not_op_vec_undef(<2 x i32> %a, <2 x i32> %b) {
+; CHECK-LABEL: @not_op_vec_undef(
+; CHECK-NEXT:    ret <2 x i32> zeroinitializer
+;
+  %t2 = and <2 x i32> %b, %a
+  %t4 = xor <2 x i32> %a, <i32 -1, i32 undef>
+  %t5 = and <2 x i32> %t2, %t4
+  ret <2 x i32> %t5
+}
+
+; A&~A == 0
+define i32 @test2(i32 %a, i32 %b) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    ret i32 0
+;
+  %t1 = and i32 %a, 1234
+  %t2 = and i32 %b, %t1
+  %t4 = xor i32 %a, -1
+  %t5 = and i32 %t2, %t4
+  ret i32 %t5
+}
+
+; (b+(a+1234))+-a -> b+1234
+define i32 @test3(i32 %b, i32 %a) {
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    [[T5:%.*]] = add i32 [[B:%.*]], 1234
+; CHECK-NEXT:    ret i32 [[T5]]
+;
+  %t1 = add i32 %a, 1234
+  %t2 = add i32 %b, %t1
+  %t4 = sub i32 0, %a
+  %t5 = add i32 %t2, %t4
+  ret i32 %t5
+}
+
+; (b+(a+1234))+~a -> b+1233
+define i32 @test4(i32 %b, i32 %a) {
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    [[T5:%.*]] = add i32 [[B:%.*]], 1233
+; CHECK-NEXT:    ret i32 [[T5]]
+;
+  %t1 = add i32 %a, 1234
+  %t2 = add i32 %b, %t1
+  %t4 = xor i32 %a, -1
+  %t5 = add i32 %t2, %t4
+  ret i32 %t5
+}
+