Fix PR13704

- The increment needs to be signed value to preserve the original value when
  its data type is larger than 64-bit integer.

llvm-svn: 162766

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/test/CodeGen/pr13704.c b/clang/test/CodeGen/pr13704.c
new file mode 100644
index 00000000000..41b8b2cc710
--- /dev/null
+++ b/clang/test/CodeGen/pr13704.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+extern void foo(__int128);
+
+void bar() {
+  __int128 x = 2;
+  x--;
+  foo(x);
+// CHECK: add nsw i128 %0, -1
+}