[PATCH v2] tests/tcg/s390x: Test overflow conditions

[Gautam Agrawal <gautamnagrawal@gmail.com>]

Add a test to check for overflow conditions in s390x.
This patch is based on the following patches :
* https://git.qemu.org/?p=qemu.git;a=commitdiff;h=5a2e67a691501
* https://git.qemu.org/?p=qemu.git;a=commitdiff;h=fc6e0d0f2db51

Signed-off-by: Gautam Agrawal <gautamnagrawal@gmail.com>
---
Changes since v1:
- Corrected the "long" data type to "long long"
- Changed local variable name in overflow function to "res" 

 tests/tcg/s390x/Makefile.target |  1 +
 tests/tcg/s390x/overflow.c      | 58 +++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 tests/tcg/s390x/overflow.c

diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 3124172736..7f86de85b9 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -16,6 +16,7 @@ TESTS+=shift
 TESTS+=trap
 TESTS+=signals-s390x
 TESTS+=branch-relative-long
+TESTS+=overflow
 
 VECTOR_TESTS=vxeh2_vs
 VECTOR_TESTS+=vxeh2_vcvt
diff --git a/tests/tcg/s390x/overflow.c b/tests/tcg/s390x/overflow.c
new file mode 100644
index 0000000000..1c59c2cb70
--- /dev/null
+++ b/tests/tcg/s390x/overflow.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+
+int overflow_add_32(int x, int y)
+{
+    int res;
+    return __builtin_add_overflow(x, y, &res);
+}
+
+int overflow_add_64(long long x, long long y)
+{
+    long long res;
+    return __builtin_add_overflow(x, y, &res);
+}
+
+int overflow_sub_32(int x, int y)
+{
+    int res;
+    return __builtin_sub_overflow(x, y, &res);
+}
+
+int overflow_sub_64(long long x, long long y)
+{
+    long long res;
+    return __builtin_sub_overflow(x, y, &res);
+}
+
+int a1_add = -2147483648;
+int b1_add = -2147483648;
+long long a2_add = -9223372036854775808ULL;
+long long b2_add = -9223372036854775808ULL;
+
+int a1_sub;
+int b1_sub = -2147483648;
+long long a2_sub = 0L;
+long long b2_sub = -9223372036854775808ULL;
+
+int main()
+{
+    int ret = 0;
+
+    if (!overflow_add_32(a1_add, b1_add)) {
+        fprintf(stderr, "data overflow while adding 32 bits\n");
+        ret = 1;
+    }
+    if (!overflow_add_64(a2_add, b2_add)) {
+        fprintf(stderr, "data overflow while adding 64 bits\n");
+        ret = 1;
+    }
+    if (!overflow_sub_32(a1_sub, b1_sub)) {
+        fprintf(stderr, "data overflow while subtracting 32 bits\n");
+        ret = 1;
+    }
+    if (!overflow_sub_64(a2_sub, b2_sub)) {
+        fprintf(stderr, "data overflow while subtracting 64 bits\n");
+        ret = 1;
+    }
+    return ret;
+}
-- 
2.34.1