1 files changed, 130 insertions, 0 deletions
diff --git a/clang-tools-extra/test/clang-tidy/bugprone-integer-division.cpp b/clang-tools-extra/test/clang-tidy/bugprone-integer-division.cpp
new file mode 100644
index 00000000000..243ad46713c
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/bugprone-integer-division.cpp
@@ -0,0 +1,130 @@
+// RUN: %check_clang_tidy %s bugprone-integer-division %t
+
+// Functions expecting a floating-point parameter.
+void floatArg(float x) {}
+void doubleArg(double x) {}
+void longDoubleArg(long double x) {}
+
+// Functions expected to return a floating-point value.
+float singleDiv() {
+  int x = -5;
+  int y = 2;
+  return x/y;
+// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
+}
+
+double wrongOrder(int x, int y) {
+  return x/y/0.1;
+// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
+}
+
+long double rightOrder(int x, int y) {
+  return 0.1/x/y; // OK
+}
+
+// Typical mathematical functions.
+float sin(float);
+double acos(double);
+long double tanh(long double);
+
+namespace std {
+  using ::sin;
+}
+
+template <typename T>
+void intDivSin(T x) {
+  sin(x);
+}
+
+int intFunc(int);
+
+struct X {
+  int n;
+  void m() {
+    sin(n / 3);
+// CHECK-MESSAGES: :[[@LINE-1]]:9: warning: result of integer division used in
+  }
+};
+
+void integerDivision() {
+  char a = 2;
+  short b = -5;
+  int c = 9784;
+  enum third { x, y, z=2 };
+  third d = z;
+  char e[] = {'a', 'b', 'c'};
+  char f = *(e + 1 / a);
+  bool g = 1;
+
+  sin(1 + c / (2 + 2));
+// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: result of integer division used in
+  sin(c / (1 + .5));
+  sin((c + .5) / 3);
+
+  sin(intFunc(3) / 5);
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: result of integer division used in
+  acos(2 / intFunc(7));
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
+
+  floatArg(1 + 2 / 3);
+// CHECK-MESSAGES: :[[@LINE-1]]:16: warning: result of integer division used in
+  sin(1 + 2 / 3);
+// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: result of integer division used in
+  intFunc(sin(1 + 2 / 3));
+// CHECK-MESSAGES: :[[@LINE-1]]:19: warning: result of integer division used in
+
+  floatArg(1 + intFunc(1 + 2 / 3));
+  floatArg(1 + 3 * intFunc(a / b));
+
+  1 << (2 / 3);
+  1 << intFunc(2 / 3);
+
+#define M_SIN sin(a / b);
+  M_SIN
+// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result of integer division used in
+
+  intDivSin<float>(a / b);
+// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: result of integer division used in
+  intDivSin<double>(c / d);
+// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: result of integer division used in
+  intDivSin<long double>(f / g);
+// CHECK-MESSAGES: :[[@LINE-1]]:26: warning: result of integer division used in
+
+  floatArg(1 / 3);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
+  doubleArg(a / b);
+// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: result of integer division used in
+  longDoubleArg(3 / d);
+// CHECK-MESSAGES: :[[@LINE-1]]:17: warning: result of integer division used in
+  floatArg(a / b / 0.1);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
+  doubleArg(1 / 3 / 0.1);
+// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: result of integer division used in
+  longDoubleArg(2 / 3 / 5);
+// CHECK-MESSAGES: :[[@LINE-1]]:17: warning: result of integer division used in
+
+  std::sin(2 / 3);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
+  ::acos(7 / d);
+// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
+  tanh(f / g);
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
+
+  floatArg(0.1 / a / b);
+  doubleArg(0.1 / 3 / 1);
+
+  singleDiv();
+  wrongOrder(a,b);
+  rightOrder(a,b);
+
+  sin(a / b);
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: result of integer division used in
+  acos(f / d);
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
+  tanh(c / g);
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
+
+  sin(3.0 / a);
+  acos(b / 3.14);
+  tanh(3.14 / f / g);
+}