From 98c202121a75c4504d5f3abe0aa45ab9f36cfca7 Mon Sep 17 00:00:00 2001
From: Clement Courbet <courbet@google.com>
Date: Fri, 19 Mar 2021 08:47:28 +0100
Subject: [PATCH] [InstCombine] Add unit test with @llvm.annotation.

In preparation for https://reviews.llvm.org/D98925
---
 .../InstCombine/annotation-intrinsic.ll       | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 test/Transforms/InstCombine/annotation-intrinsic.ll

diff --git a/test/Transforms/InstCombine/annotation-intrinsic.ll b/test/Transforms/InstCombine/annotation-intrinsic.ll
new file mode 100644
index 00000000000..bfc7649bbab
--- /dev/null
+++ b/test/Transforms/InstCombine/annotation-intrinsic.ll
@@ -0,0 +1,28 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine %s -S -o - | FileCheck %s
+
+; This tests that llvm.annotation does not prevent load combining.
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-grtev4-linux-gnu"
+
+declare i32 @llvm.annotation.i32(i32, i8*, i8*, i32) #1
+
+define dso_local i32 @annotated(i32* %c) local_unnamed_addr #0 {
+; CHECK-LABEL: @annotated(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = load i32, i32* [[C:%.*]], align 4
+; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.annotation.i32(i32 [[TMP0]], i8* undef, i8* undef, i32 undef)
+; CHECK-NEXT:    [[TMP2:%.*]] = load i32, i32* [[C]], align 4
+; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[TMP1]], [[TMP2]]
+; CHECK-NEXT:    ret i32 [[ADD]]
+;
+entry:
+  %0 = load i32, i32* %c, align 4
+  %1 = call i32 @llvm.annotation.i32(i32 %0, i8* undef, i8* undef, i32 undef)
+  %2 = load i32, i32* %c, align 4
+  %add = add nsw i32 %1, %2
+  ret i32 %add
+}
+
+attributes #0 = { nofree nounwind uwtable willreturn mustprogress }