1 files changed, 15 insertions, 0 deletions
diff --git a/test/CodeGen/X86/add-trick64.ll b/test/CodeGen/X86/add-trick64.ll
new file mode 100644
index 0000000000..5466d9d441
--- /dev/null
+++ b/test/CodeGen/X86/add-trick64.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | llc -march=x86-64 > %t
+; RUN: not grep add %t
+; RUN: grep subq %t | count 2
+
+; The immediate can be encoded in a smaller way if the
+; instruction is a sub instead of an add.
+
+define i64 @foo(i64 inreg %a) nounwind {
+  %b = add i64 %a, 2147483648
+  ret i64 %b
+}
+define i64 @bar(i64 inreg %a) nounwind {
+  %b = add i64 %a, 128
+  ret i64 %b
+}