Add comments and test case for [DAG] Keep the opaque constant flag when performing unary constant folding operations (r204737).
llvm-svn: 205474
diff --git a/llvm/test/CodeGen/X86/const-base-addr.ll b/llvm/test/CodeGen/X86/const-base-addr.ll
new file mode 100644
index 0000000..f859d7fa
--- /dev/null
+++ b/llvm/test/CodeGen/X86/const-base-addr.ll
@@ -0,0 +1,24 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.9.0"
+
+%T = type { i32, i32, i32, i32 }
+
+define i32 @test1() nounwind {
+; CHECK-LABEL: test1
+; CHECK: movabsq $123456789012345678, %rcx
+; CHECK-NEXT: movl 4(%rcx), %eax
+; CHECK-NEXT: addl 8(%rcx), %eax
+; CHECK-NEXT: addl 12(%rcx), %eax
+ %addr1 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 1
+ %tmp1 = load i32* %addr1
+ %addr2 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 2
+ %tmp2 = load i32* %addr2
+ %addr3 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 3
+ %tmp3 = load i32* %addr3
+ %tmp4 = add i32 %tmp1, %tmp2
+ %tmp5 = add i32 %tmp3, %tmp4
+ ret i32 %tmp5
+}
+