From 7228b5e6f4708e83a881f5cb3b18b5a763d7725a Mon Sep 17 00:00:00 2001
From: Juneyoung Lee <aqjune@gmail.com>
Date: Wed, 10 Mar 2021 17:54:31 +0900
Subject: [PATCH] [InstSimplify] Add tests for pr49495 (NFC)

---
 test/Transforms/InstSimplify/pr49495.ll | 30 +++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 test/Transforms/InstSimplify/pr49495.ll

diff --git a/test/Transforms/InstSimplify/pr49495.ll b/test/Transforms/InstSimplify/pr49495.ll
new file mode 100644
index 00000000000..f085de3b4a2
--- /dev/null
+++ b/test/Transforms/InstSimplify/pr49495.ll
@@ -0,0 +1,30 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+; The first comparison (a != b) should not be dropped
+define i1 @test1(i8* %a, i8* %b) {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    [[A2:%.*]] = getelementptr inbounds i8, i8* [[A:%.*]], i64 -1
+; CHECK-NEXT:    [[COND2:%.*]] = icmp ugt i8* [[A2]], [[B:%.*]]
+; CHECK-NEXT:    ret i1 [[COND2]]
+;
+  %cond1 = icmp ne i8* %a, %b
+  %a2 = getelementptr inbounds i8, i8* %a, i64 -1
+  %cond2 = icmp ugt i8* %a2, %b
+  %res = select i1 %cond1, i1 %cond2, i1 false
+  ret i1 %res
+}
+
+; The first comparison (a != b) should not be dropped
+define i1 @test2(i32 %a, i32 %b) {
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    [[A2:%.*]] = add nuw i32 [[A:%.*]], 1
+; CHECK-NEXT:    [[COND2:%.*]] = icmp ult i32 [[A2]], [[B:%.*]]
+; CHECK-NEXT:    ret i1 [[COND2]]
+;
+  %cond1 = icmp ne i32 %a, %b
+  %a2 = add nuw i32 %a, 1
+  %cond2 = icmp ult i32 %a2, %b
+  %res = select i1 %cond1, i1 %cond2, i1 false
+  ret i1 %res
+}