vendor/compiler-rt/compiler-rt-r172839

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/ubsan/lit_tests/Integer/negate-overflow.cpp b/lib/ubsan/lit_tests/Integer/negate-overflow.cpp
new file mode 100644
index 000000000000..2ee4f10115e8
--- /dev/null
+++ b/lib/ubsan/lit_tests/Integer/negate-overflow.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang -fsanitize=signed-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=CHECKS
+// RUN: %clang -fsanitize=unsigned-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=CHECKU
+
+int main() {
+  // CHECKS-NOT: runtime error
+  // CHECKU: negate-overflow.cpp:[[@LINE+2]]:3: runtime error: negation of 2147483648 cannot be represented in type 'unsigned int'
+  // CHECKU-NOT: cast to an unsigned
+  -unsigned(-0x7fffffff - 1); // ok
+  // CHECKS: negate-overflow.cpp:[[@LINE+2]]:10: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
+  // CHECKU-NOT: runtime error
+  return -(-0x7fffffff - 1);
+}