From d5775617c8c2a1f393a7edd339f63fc3c4c7c0a4 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Tue, 25 Apr 2017 06:47:49 +0000
Subject: [PATCH] [InstCombine] Add test cases for missing commute handling in
 ((A ^ C) ^ B) & (B ^ A) -> (B ^ A) & ~C

llvm-svn: 301297
---
 llvm/test/Transforms/InstCombine/xor2.ll | 75 ++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/llvm/test/Transforms/InstCombine/xor2.ll b/llvm/test/Transforms/InstCombine/xor2.ll
index 79e6272..f817ac5 100644
--- a/llvm/test/Transforms/InstCombine/xor2.ll
+++ b/llvm/test/Transforms/InstCombine/xor2.ll
@@ -191,6 +191,81 @@ define i32 @test11(i32 %A, i32 %B) {
   ret i32 %and
 }
 
+define i32 @test11b(i32 %A, i32 %B) {
+; CHECK-LABEL: @test11b(
+; CHECK-NEXT:    ret i32 0
+;
+  %xor1 = xor i32 %B, %A
+  %not = xor i32 %A, -1
+  %xor2 = xor i32 %not, %B
+  %and = and i32 %xor2, %xor1
+  ret i32 %and
+}
+
+define i32 @test11c(i32 %A, i32 %B) {
+; CHECK-LABEL: @test11c(
+; CHECK-NEXT:    [[XOR1:%.*]] = xor i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[A]], -1
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[NOT]], [[B]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[XOR1]], [[XOR2]]
+; CHECK-NEXT:    ret i32 [[AND]]
+;
+  %xor1 = xor i32 %A, %B
+  %not = xor i32 %A, -1
+  %xor2 = xor i32 %not, %B
+  %and = and i32 %xor1, %xor2
+  ret i32 %and
+}
+
+define i32 @test11d(i32 %A, i32 %B) {
+; CHECK-LABEL: @test11d(
+; CHECK-NEXT:    [[XOR1:%.*]] = xor i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[A]], -1
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[NOT]], [[B]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[XOR2]], [[XOR1]]
+; CHECK-NEXT:    ret i32 [[AND]]
+;
+  %xor1 = xor i32 %A, %B
+  %not = xor i32 %A, -1
+  %xor2 = xor i32 %not, %B
+  %and = and i32 %xor2, %xor1
+  ret i32 %and
+}
+
+define i32 @test11e(i32 %A, i32 %B, i32 %C) {
+; CHECK-LABEL: @test11e(
+; CHECK-NEXT:    [[FORCE:%.*]] = mul i32 [[B:%.*]], [[C:%.*]]
+; CHECK-NEXT:    [[XOR1:%.*]] = xor i32 [[FORCE]], [[A:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[A]], -1
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[FORCE]], [[NOT]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[XOR1]], [[XOR2]]
+; CHECK-NEXT:    ret i32 [[AND]]
+;
+  %force = mul i32 %B, %C
+  %xor1 = xor i32 %force, %A
+  %not = xor i32 %A, -1
+  %xor2 = xor i32 %force, %not
+  %and = and i32 %xor1, %xor2
+  ret i32 %and
+}
+
+define i32 @test11f(i32 %A, i32 %B, i32 %C) {
+; CHECK-LABEL: @test11f(
+; CHECK-NEXT:    [[FORCE:%.*]] = mul i32 [[B:%.*]], [[C:%.*]]
+; CHECK-NEXT:    [[XOR1:%.*]] = xor i32 [[FORCE]], [[A:%.*]]
+; CHECK-NEXT:    [[NOT:%.*]] = xor i32 [[A]], -1
+; CHECK-NEXT:    [[XOR2:%.*]] = xor i32 [[FORCE]], [[NOT]]
+; CHECK-NEXT:    [[AND:%.*]] = and i32 [[XOR2]], [[XOR1]]
+; CHECK-NEXT:    ret i32 [[AND]]
+;
+  %force = mul i32 %B, %C
+  %xor1 = xor i32 %force, %A
+  %not = xor i32 %A, -1
+  %xor2 = xor i32 %force, %not
+  %and = and i32 %xor2, %xor1
+  ret i32 %and
+}
+
 define i32 @test12(i32 %a, i32 %b) {
 ; CHECK-LABEL: @test12(
 ; CHECK-NEXT:    [[TMP1:%.*]] = and i32 %a, %b
-- 
2.7.4