--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/llvm/test/Transforms/CodeGenPrepare/X86/sink-addrspacecast.ll	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,39 @@
+; RUN: opt -S -codegenprepare < %s | FileCheck %s -check-prefix=CHECK -check-prefix=GEP
+
+target datalayout =
+"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; CHECK-LABEL: @load_cast_gep
+; GEP: [[CAST:%[0-9]+]] = addrspacecast i64* %base to i8 addrspace(1)*
+; GEP: getelementptr inbounds i8, i8 addrspace(1)* [[CAST]], i64 40
+define void @load_cast_gep(i1 %cond, i64* %base) {
+entry:
+  %addr = getelementptr inbounds i64, i64* %base, i64 5
+  %casted = addrspacecast i64* %addr to i32 addrspace(1)*
+  br i1 %cond, label %if.then, label %fallthrough
+
+if.then:
+  %v = load i32, i32 addrspace(1)* %casted, align 4
+  br label %fallthrough
+
+fallthrough:
+  ret void
+}
+
+; CHECK-LABEL: @store_gep_cast
+; GEP: [[CAST:%[0-9]+]] = addrspacecast i64* %base to i8 addrspace(1)*
+; GEP: getelementptr inbounds i8, i8 addrspace(1)* [[CAST]], i64 20
+define void @store_gep_cast(i1 %cond, i64* %base) {
+entry:
+  %casted = addrspacecast i64* %base to i32 addrspace(1)*
+  %addr = getelementptr inbounds i32, i32 addrspace(1)* %casted, i64 5
+  br i1 %cond, label %if.then, label %fallthrough
+
+if.then:
+  store i32 0, i32 addrspace(1)* %addr, align 4
+  br label %fallthrough
+
+fallthrough:
+  ret void
+}