1 files changed, 54 insertions, 0 deletions
diff --git a/llvm/test/Transforms/GlobalOpt/heap-sra-phi-no-null-opt.ll b/llvm/test/Transforms/GlobalOpt/heap-sra-phi-no-null-opt.ll
new file mode 100644
index 00000000000..06c74e5bfc4
--- /dev/null
+++ b/llvm/test/Transforms/GlobalOpt/heap-sra-phi-no-null-opt.ll
@@ -0,0 +1,54 @@
+; RUN: opt < %s -globalopt -S | FileCheck %s
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
+
+%struct.foo = type { i32, i32 }
+
+@X = internal global %struct.foo* null		; <%struct.foo**> [#uses=2]
+; CHECK: @X
+; CHECK-NOT: @X.f0
+
+define void @bar(i32 %Size) nounwind noinline #0 {
+;  CHECK-LABEL: @bar(
+entry:
+	%malloccall = tail call i8* @malloc(i64 8000000) ; <i8*> [#uses=1]
+	%tmp = bitcast i8* %malloccall to [1000000 x %struct.foo]* ; <[1000000 x %struct.foo]*> [#uses=1]
+	%.sub = getelementptr [1000000 x %struct.foo], [1000000 x %struct.foo]* %tmp, i32 0, i32 0		; <%struct.foo*> [#uses=1]
+	store %struct.foo* %.sub, %struct.foo** @X, align 4
+	ret void
+}
+
+declare noalias i8* @malloc(i64)
+
+define i32 @baz() nounwind readonly noinline #0 {
+; CHECK-LABEL: @baz(
+bb1.thread:
+	%tmpLD1 = load %struct.foo*, %struct.foo** @X, align 4		; <%struct.foo*> [#uses=1]
+; CHECK: load %struct.foo*, %struct.foo** @X, align 4
+	br label %bb1
+
+bb1:		; preds = %bb1, %bb1.thread
+        %tmp = phi %struct.foo* [%tmpLD1, %bb1.thread ], [ %tmpLD2, %bb1 ]		; <i32> [#uses=2]
+; CHECK: %tmp = phi %struct.foo* [ %tmpLD1, %bb1.thread ], [ %tmpLD2, %bb1 ]
+	%i.0.reg2mem.0 = phi i32 [ 0, %bb1.thread ], [ %indvar.next, %bb1 ]		; <i32> [#uses=2]
+	%sum.0.reg2mem.0 = phi i32 [ 0, %bb1.thread ], [ %tmp3, %bb1 ]		; <i32> [#uses=1]
+	%tmp1 = getelementptr %struct.foo, %struct.foo* %tmp, i32 %i.0.reg2mem.0, i32 0		; <i32*> [#uses=1]
+	%tmp2 = load i32, i32* %tmp1, align 4		; <i32> [#uses=1]
+; CHECK: load i32, i32* %tmp1, align 4
+	%tmp6 = add i32 %tmp2, %sum.0.reg2mem.0		; <i32> [#uses=2]
+	%tmp4 = getelementptr %struct.foo, %struct.foo* %tmp, i32 %i.0.reg2mem.0, i32 1		; <i32*> [#uses=1]
+        %tmp5 = load i32 , i32 * %tmp4
+;  CHECK: load i32, i32* %tmp4
+        %tmp3 = add i32 %tmp5, %tmp6
+	%indvar.next = add i32 %i.0.reg2mem.0, 1		; <i32> [#uses=2]
+
+      	%tmpLD2 = load %struct.foo*, %struct.foo** @X, align 4		; <%struct.foo*> [#uses=1]
+; CHECK: load %struct.foo*, %struct.foo** @X, align 4
+
+	%exitcond = icmp eq i32 %indvar.next, 1200		; <i1> [#uses=1]
+	br i1 %exitcond, label %bb2, label %bb1
+
+bb2:		; preds = %bb1
+	ret i32 %tmp3
+}
+
+attributes #0 = { "null-pointer-is-valid"="true" }