[InstCombine] Add test cases demonstrating missing handling for the commuted version of a transform. NFC.

llvm-svn: 299836

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/xor2.ll b/llvm/test/Transforms/InstCombine/xor2.ll
index 5c209f660ba..ca93419681a 100644
--- a/llvm/test/Transforms/InstCombine/xor2.ll
+++ b/llvm/test/Transforms/InstCombine/xor2.ll
@@ -144,6 +144,20 @@ define i32 @test9(i32 %b, i32 %c) {
   ret i32 %xor2
 }
 
+; (A & B) ^ (B ^ A) -> (A | B)
+define i32 @test9b(i32 %b, i32 %c) {
+; CHECK-LABEL: @test9b(
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[B:%.*]], [[C:%.*]]
+; CHECK-NEXT:    [[XOR:%.*]] = xor i32 [[C]], [[B]]
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[AND]], [[XOR]]
+; CHECK-NEXT:    ret i32 [[XOR2]]
+;
+  %and = and i32 %b, %c
+  %xor = xor i32 %c, %b
+  %xor2 = xor i32 %and, %xor
+  ret i32 %xor2
+}
+
 ; (A ^ B) ^ (A & B) -> (A | B)
 define i32 @test10(i32 %b, i32 %c) {
 ; CHECK-LABEL: @test10(
@@ -156,6 +170,20 @@ define i32 @test10(i32 %b, i32 %c) {
   ret i32 %xor2
 }
 
+; (A ^ B) ^ (A & B) -> (A | B)
+define i32 @test10b(i32 %b, i32 %c) {
+; CHECK-LABEL: @test10b(
+; CHECK-NEXT:    [[XOR:%.*]] = xor i32 [[B:%.*]], [[C:%.*]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[C]], [[B]]
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[XOR]], [[AND]]
+; CHECK-NEXT:    ret i32 [[XOR2]]
+;
+  %xor = xor i32 %b, %c
+  %and = and i32 %c, %b
+  %xor2 = xor i32 %xor, %and
+  ret i32 %xor2
+}
+
 define i32 @test11(i32 %A, i32 %B) {
 ; CHECK-LABEL: @test11(
 ; CHECK-NEXT:    ret i32 0