Pre-commit test cases

Author: dianqk

llvm/test/Transforms/GlobalOpt/alias-weak.ll

@@ -0,0 +1,52 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --include-generated-funcs --version 4
+; RUN: opt < %s -passes=globalopt -S | FileCheck %s
+
+@f1_alias = linkonce_odr hidden alias void (), ptr @f1
+@f2_alias = linkonce_odr hidden alias void (), ptr @f2
+
+define void @foo() {
+  call void @f1_alias()
+  ret void
+}
+
+define void @bar() {
+  call void @f1()
+  ret void
+}
+
+define void @baz() {
+  call void @f2_alias()
+  ret void
+}
+
+; FIXME: We cannot use `f1_alias` to replace `f1` because they are both in use
+; and `f1_alias` could be replaced at link time.
+define internal void @f1() {
+  ret void
+}
+
+define internal void @f2() {
+  ret void
+}
+; CHECK-LABEL: define void @foo() local_unnamed_addr {
+; CHECK-NEXT:    call void @f1_alias()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define void @bar() local_unnamed_addr {
+; CHECK-NEXT:    call void @f1_alias()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define void @baz() local_unnamed_addr {
+; CHECK-NEXT:    call void @f2_alias()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define linkonce_odr hidden void @f1_alias() local_unnamed_addr {
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define linkonce_odr hidden void @f2_alias() local_unnamed_addr {
+; CHECK-NEXT:    ret void
+;