new testcase, from... PR491.

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@24045 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 31 insertions, 0 deletions

diff --git a/SingleSource/Regression/C/PR491.c b/SingleSource/Regression/C/PR491.c
new file mode 100644
index 00000000..b082fa1f
--- /dev/null
+++ b/SingleSource/Regression/C/PR491.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+static int assert_fail(const char* s, unsigned l)
+{
+    fprintf(stderr, "assertion failed in line %u: '%s'\n", l, s);
+    return 0;
+}
+#define ASSERT(expr)    ((expr) ? 1 : assert_fail(#expr,__LINE__))
+
+int test(int r) {
+#if !defined(__i386__)
+  #if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
+     return r;
+  #else
+     if (BYTE_ORDER != LITTLE_ENDIAN) return r;
+  #endif
+#endif
+
+    /* little endian */
+    union { long l; unsigned char c[sizeof(long)]; } u;
+    u.l = 0; u.c[0] = 0x80;
+    r &= ASSERT(u.l == 128);
+    u.l = 0; u.c[sizeof(long)-1] = 0x80;
+    r &= ASSERT(u.l < 0);
+    return r;
+}
+
+int main() {
+    return test(1) == 1;
+}
+