1 files changed, 40 insertions, 0 deletions
diff --git a/llvm/test/Transforms/DeadStoreElimination/const-pointers.ll b/llvm/test/Transforms/DeadStoreElimination/const-pointers.ll
new file mode 100644
index 00000000000..e4403edbed2
--- /dev/null
+++ b/llvm/test/Transforms/DeadStoreElimination/const-pointers.ll
@@ -0,0 +1,40 @@
+; RUN: opt -basicaa -dse -S < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+%t = type { i32 }
+
+@g = global i32 42
+
+define void @test1(%t* noalias %pp) {
+  %p = getelementptr inbounds %t, %t* %pp, i32 0, i32 0
+
+  store i32 1, i32* %p; <-- This is dead
+  %x = load i32, i32* inttoptr (i32 12345 to i32*)
+  store i32 %x, i32* %p
+  ret void
+; CHECK-LABEL: define void @test1(
+; CHECK: store
+; CHECK-NOT: store
+; CHECK: ret void
+}
+
+define void @test3() {
+  store i32 1, i32* @g; <-- This is dead.
+  store i32 42, i32* @g
+  ret void
+; CHECK-LABEL: define void @test3(
+; CHECK: store
+; CHECK-NOT: store
+; CHECK: ret void
+}
+
+define void @test4(i32* %p) {
+  store i32 1, i32* %p
+  %x = load i32, i32* @g; <-- %p and @g could alias
+  store i32 %x, i32* %p
+  ret void
+; CHECK-LABEL: define void @test4(
+; CHECK: store
+; CHECK: store
+; CHECK: ret void
+}