1 files changed, 41 insertions, 0 deletions
diff --git a/llvm/test/Feature/OperandBundles/adce.ll b/llvm/test/Feature/OperandBundles/adce.ll
new file mode 100644
index 00000000000..33bb87e5fc1
--- /dev/null
+++ b/llvm/test/Feature/OperandBundles/adce.ll
@@ -0,0 +1,41 @@
+; RUN: opt -S -adce < %s | FileCheck %s
+
+; While it is normally okay to DCE out calls to @readonly_function and
+; @readnone_function, we cannot do that if they're carrying operand
+; bundles since the presence of unknown operand bundles implies
+; arbitrary memory effects.
+
+declare void @readonly_function() readonly nounwind
+declare void @readnone_function() readnone nounwind
+
+define void @test0() {
+; CHECK-LABEL: @test0(
+ entry:
+  call void @readonly_function() [ "tag"() ]
+; CHECK: call void @readonly_function
+  ret void
+}
+
+define void @test1() {
+; CHECK-LABEL: @test1(
+ entry:
+  call void @readnone_function() [ "tag"() ]
+; CHECK: call void @readnone_function
+  ret void
+}
+
+define void @test2() {
+; CHECK-LABEL: @test2(
+ entry:
+; CHECK-NOT: @readonly_function(
+  call void @readonly_function() readonly [ "tag"() ]
+  ret void
+}
+
+define void @test3() {
+; CHECK-LABEL: @test3(
+ entry:
+; CHECK-NOT: @readnone_function(
+  call void @readnone_function() readnone [ "tag"() ]
+  ret void
+}