diff --git a/llvm/test/Transforms/FunctionAttrs/nosync.ll b/llvm/test/Transforms/FunctionAttrs/nosync.ll
new file mode 100644
index 0000000000000..8d578e6b67fc7
--- /dev/null
+++ b/llvm/test/Transforms/FunctionAttrs/nosync.ll
@@ -0,0 +1,91 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-attributes
+; RUN: opt < %s -function-attrs -S | FileCheck %s
+; RUN: opt < %s -passes=function-attrs -S | FileCheck %s
+
+; Base case, empty function
+define void @test1() {
+; CHECK: Function Attrs: norecurse nounwind readnone willreturn
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret void
+;
+  ret void
+}
+
+; Show the bottom up walk
+define void @test2() {
+; CHECK: Function Attrs: norecurse nounwind readnone willreturn
+; CHECK-LABEL: @test2(
+; CHECK-NEXT:    call void @test1()
+; CHECK-NEXT:    ret void
+;
+  call void @test1()
+  ret void
+}
+
+declare void @unknown() convergent
+
+; Negative case with convergent function
+define void @test3() convergent {
+; CHECK: Function Attrs: convergent
+; CHECK-LABEL: @test3(
+; CHECK-NEXT:    call void @unknown()
+; CHECK-NEXT:    ret void
+;
+  call void @unknown()
+  ret void
+}
+
+define i32 @test4(i32 %a, i32 %b) {
+; CHECK: Function Attrs: norecurse nounwind readnone willreturn
+; CHECK-LABEL: @test4(
+; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[A:%.*]], [[B:%.*]]
+; CHECK-NEXT:    ret i32 [[A]]
+;
+  %add = add i32 %a, %b
+  ret i32 %a
+}
+
+; negative case - explicit sync
+define void @test5(i8* %p) {
+; CHECK: Function Attrs: nofree norecurse nounwind willreturn
+; CHECK-LABEL: @test5(
+; CHECK-NEXT:    store atomic i8 0, i8* [[P:%.*]] seq_cst, align 1
+; CHECK-NEXT:    ret void
+;
+  store atomic i8 0, i8* %p seq_cst, align 1
+  ret void
+}
+
+; negative case - explicit sync
+define i8 @test6(i8* %p) {
+; CHECK: Function Attrs: nofree norecurse nounwind willreturn
+; CHECK-LABEL: @test6(
+; CHECK-NEXT:    [[V:%.*]] = load atomic i8, i8* [[P:%.*]] seq_cst, align 1
+; CHECK-NEXT:    ret i8 [[V]]
+;
+  %v = load atomic i8, i8* %p seq_cst, align 1
+  ret i8 %v
+}
+
+; negative case - explicit sync
+define void @test7(i8* %p) {
+; CHECK: Function Attrs: nofree norecurse nounwind willreturn
+; CHECK-LABEL: @test7(
+; CHECK-NEXT:    [[TMP1:%.*]] = atomicrmw add i8* [[P:%.*]], i8 0 seq_cst, align 1
+; CHECK-NEXT:    ret void
+;
+  atomicrmw add i8* %p, i8 0 seq_cst, align 1
+  ret void
+}
+
+; negative case - explicit sync
+define void @test8(i8* %p) {
+; CHECK: Function Attrs: nofree norecurse nounwind willreturn
+; CHECK-LABEL: @test8(
+; CHECK-NEXT:    fence seq_cst
+; CHECK-NEXT:    ret void
+;
+  fence seq_cst
+  ret void
+}
+