An objc_retain can serve as a may-use for a different pointer.
rdar://11931823.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160637 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ObjCARC.cpp b/lib/Transforms/Scalar/ObjCARC.cpp
index 64f71d3..3222f20 100644
--- a/lib/Transforms/Scalar/ObjCARC.cpp
+++ b/lib/Transforms/Scalar/ObjCARC.cpp
@@ -2829,7 +2829,10 @@
}
S.IncrementNestCount();
- return NestingDetected;
+
+ // A retain can be a potential use; procede to the generic checking
+ // code below.
+ break;
}
case IC_Release: {
Arg = GetObjCArg(Inst);
diff --git a/test/Transforms/ObjCARC/basic.ll b/test/Transforms/ObjCARC/basic.ll
index ba2f778..d9bb3f2 100644
--- a/test/Transforms/ObjCARC/basic.ll
+++ b/test/Transforms/ObjCARC/basic.ll
@@ -1871,6 +1871,30 @@
ret i8* %retval
}
+; An objc_retain can serve as a may-use for a different pointer.
+; rdar://11931823
+
+; CHECK: define void @test66(
+; CHECK: %tmp7 = tail call i8* @objc_retain(i8* %cond) nounwind
+; CHECK: tail call void @objc_release(i8* %cond) nounwind
+; CHECK: }
+define void @test66(i8* %tmp5, i8* %bar, i1 %tobool, i1 %tobool1, i8* %call) {
+entry:
+ br i1 %tobool, label %cond.true, label %cond.end
+
+cond.true:
+ br label %cond.end
+
+cond.end: ; preds = %cond.true, %entry
+ %cond = phi i8* [ %tmp5, %cond.true ], [ %call, %entry ]
+ %tmp7 = tail call i8* @objc_retain(i8* %cond) nounwind
+ tail call void @objc_release(i8* %call) nounwind
+ %tmp8 = select i1 %tobool1, i8* %cond, i8* %bar
+ %tmp9 = tail call i8* @objc_retain(i8* %tmp8) nounwind
+ tail call void @objc_release(i8* %cond) nounwind
+ ret void
+}
+
declare void @bar(i32 ()*)
; A few real-world testcases.