--- /dev/null
+; RUN: opt -disable-output -debugify-each -gvn < %s 2>&1 | FileCheck %s
+
+; CHECK-NOT: ERROR: Instruction with empty DebugLoc in function _Z3bazv -- {{%.*}} = phi
+; CHECK: CheckFunctionDebugify [Global Value Numbering]: PASS
+
+@foo = dso_local local_unnamed_addr global i32 0, align 4
+@x = global i8 17
+
+define dso_local void @_Z3bazv() local_unnamed_addr #0 {
+entry:
+ br label %for.cond
+
+for.cond.loopexit.loopexit: ; preds = %for.inc
+ br label %for.cond.loopexit
+
+for.cond.loopexit: ; preds = %for.cond.loopexit.loopexit, %for.cond
+ br label %for.cond
+
+for.cond: ; preds = %for.cond.loopexit, %entry
+ %.pr = load i32, i32* @foo, align 4
+ %tobool1 = icmp eq i32 %.pr, 0
+ br i1 %tobool1, label %for.cond.loopexit, label %for.inc.preheader
+
+for.inc.preheader: ; preds = %for.cond
+ br label %for.inc
+
+for.inc: ; preds = %for.inc.preheader, %for.inc
+ %val = load i8, i8* @x
+ %conv = sext i8 %val to i32
+ store i32 %conv, i32* @foo, align 4
+ %tobool = icmp eq i8 %val, 0
+ br i1 %tobool, label %for.cond.loopexit.loopexit, label %for.inc
+}
+
+declare dso_local signext i8 @_Z3barv() local_unnamed_addr #1