1 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/Transforms/WholeProgramDevirt/uniform-retval.ll b/llvm/test/Transforms/WholeProgramDevirt/uniform-retval.ll
new file mode 100644
index 00000000000..f6433c32aba
--- /dev/null
+++ b/llvm/test/Transforms/WholeProgramDevirt/uniform-retval.ll
@@ -0,0 +1,38 @@
+; RUN: opt -S -wholeprogramdevirt %s | FileCheck %s
+
+target datalayout = "e-p:64:64"
+target triple = "x86_64-unknown-linux-gnu"
+
+@vt1 = constant [1 x i8*] [i8* bitcast (i32 (i8*)* @vf1 to i8*)]
+@vt2 = constant [1 x i8*] [i8* bitcast (i32 (i8*)* @vf2 to i8*)]
+
+define i32 @vf1(i8* %this) readnone {
+  ret i32 123
+}
+
+define i32 @vf2(i8* %this) readnone {
+  ret i32 123
+}
+
+; CHECK: define i32 @call
+define i32 @call(i8* %obj) {
+  %vtableptr = bitcast i8* %obj to [1 x i8*]**
+  %vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
+  %vtablei8 = bitcast [1 x i8*]* %vtable to i8*
+  %p = call i1 @llvm.bitset.test(i8* %vtablei8, metadata !"bitset")
+  call void @llvm.assume(i1 %p)
+  %fptrptr = getelementptr [1 x i8*], [1 x i8*]* %vtable, i32 0, i32 0
+  %fptr = load i8*, i8** %fptrptr
+  %fptr_casted = bitcast i8* %fptr to i32 (i8*)*
+  %result = call i32 %fptr_casted(i8* %obj)
+  ; CHECK-NOT: call
+  ; CHECK: ret i32 123
+  ret i32 %result
+}
+
+declare i1 @llvm.bitset.test(i8*, metadata)
+declare void @llvm.assume(i1)
+
+!0 = !{!"bitset", [1 x i8*]* @vt1, i32 0}
+!1 = !{!"bitset", [1 x i8*]* @vt2, i32 0}
+!llvm.bitsets = !{!0, !1}