Added lowering pass

1 files changed, 72 insertions, 0 deletions

diff --git a/test/Feature/Atomic.c b/test/Feature/Atomic.c
new file mode 100644
index 00000000..8b729de7
--- /dev/null
+++ b/test/Feature/Atomic.c
@@ -0,0 +1,72 @@
+// REQUIRES: geq-llvm-3.7
+// RUN: %llvmgcc %s -emit-llvm -g -c -o %t.bc
+// RUN: rm -rf %t.klee-out
+// RUN: %klee --output-dir=%t.klee-out --exit-on-error %t.bc 2>%t.log
+// RUN: cat %t.klee-out/assembly.ll | FileCheck %s
+
+// Checks that KLEE lowers atomic instructions to non-atomic operations
+
+#include <assert.h>
+#include <stdatomic.h>
+
+void test_add() {
+  atomic_int a = 7;
+  atomic_fetch_add(&a, 7);
+  // CHECK-NOT: atomicrmw add
+  assert(a == 14);
+}
+
+void test_sub() {
+  atomic_int a = 7;
+  atomic_fetch_sub(&a, 7);
+  // CHECK-NOT: atomicrmw sub
+  assert(a == 0);
+}
+
+void test_and() {
+  atomic_int a = 0b10001;
+  atomic_fetch_and(&a, 0b00101);
+  // CHECK-NOT: atomicrmw and
+  assert(a == 0b00001);
+}
+
+void test_or() {
+  atomic_int a = 0b10001;
+  atomic_fetch_or(&a, 0b00101);
+  // CHECK-NOT: atomicrmw or
+  assert(a == 0b10101);
+}
+
+void test_xor() {
+  atomic_int a = 0b10001;
+  atomic_fetch_xor(&a, 0b00101);
+  // CHECK-NOT: atomicrmw xor
+  assert(a == 0b10100);
+}
+
+void test_xchg() {
+  atomic_int a = 7;
+  atomic_exchange(&a, 10);
+  // CHECK-NOT: atomicrmw xchg
+  assert(a == 10);
+}
+
+void test_cmp_xchg() {
+  atomic_int a = 7;
+  int b = 7;
+  atomic_compare_exchange_weak(&a, &b, 10);
+  // CHECK-NOT: cmpxchg weak
+  assert(a == 10);
+  assert(b == 7);
+}
+
+int main() {
+  test_and();
+  test_sub();
+  test_and();
+  test_or();
+  test_xor();
+  test_xchg();
+  test_cmp_xchg();
+  return 0;
+}