1 files changed, 40 insertions, 0 deletions
diff --git a/test/Transforms/LICM/PR21582.ll b/test/Transforms/LICM/PR21582.ll
new file mode 100644
index 0000000..c068c2f
--- /dev/null
+++ b/test/Transforms/LICM/PR21582.ll
@@ -0,0 +1,40 @@
+; RUN: opt < %s -basicaa -licm -S | FileCheck %s
+@b = external global i32, align 4
+@fn3.i = external global i32, align 4
+
+declare i32 @g() nounwind
+
+define i32 @f() {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.end, %entry
+; CHECK-LABEL: for.cond:
+; CHECK: store i32 0, i32* @b
+  store i32 0, i32* @b, align 4
+  br i1 true, label %for.body.preheader, label %for.end
+
+for.body.preheader:                               ; preds = %for.cond
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %for.body.preheader
+  %g.15 = phi i32 [ undef, %for.body ], [ 0, %for.body.preheader ]
+  %arrayidx2 = getelementptr inbounds i32* @fn3.i, i64 0
+  %0 = load i32* %arrayidx2, align 4
+  %call = call i32 @g()
+  br i1 false, label %for.body, label %for.end.loopexit
+
+for.end.loopexit:                                 ; preds = %for.body
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %for.cond
+  %whatever = phi i32 [ %call, %for.end.loopexit ], [ undef, %for.cond ]
+  br i1 false, label %for.cond, label %if.then
+
+if.then:                                          ; preds = %for.end
+; CHECK-LABEL: if.then:
+; CHECK: phi i32 [ {{.*}}, %for.end ]
+; CHECK-NOT: store i32 0, i32* @b
+; CHECK: ret i32
+  ret i32 %whatever
+}