1 files changed, 57 insertions, 0 deletions
diff --git a/clang-tools-extra/test/clang-tidy/cppcoreguidelines-narrowing-conversions-narrowingfloatingpoint-option.cpp b/clang-tools-extra/test/clang-tidy/cppcoreguidelines-narrowing-conversions-narrowingfloatingpoint-option.cpp
new file mode 100644
index 00000000000..14840df18d0
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/cppcoreguidelines-narrowing-conversions-narrowingfloatingpoint-option.cpp
@@ -0,0 +1,57 @@
+// RUN: %check_clang_tidy %s cppcoreguidelines-narrowing-conversions %t \
+// RUN: -- -- -target x86_64-unknown-linux -fsigned-char
+
+namespace floats {
+
+void narrow_constant_floating_point_to_int_not_ok(double d) {
+  int i = 0;
+  i += 0.5;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
+  i += 0.5f;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
+  i *= 0.5f;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
+  i /= 0.5f;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'float' to 'int' [cppcoreguidelines-narrowing-conversions]
+  i += (double)0.5f;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from constant 'double' to 'int' [cppcoreguidelines-narrowing-conversions]
+  i += 2.0;
+  i += 2.0f;
+}
+
+double operator"" _double(unsigned long long);
+
+float narrow_double_to_float_return() {
+  return 0.5;
+}
+
+void narrow_double_to_float_not_ok(double d) {
+  float f;
+  f = d;
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f = 15_double;
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f += d;
+  // CHECK-MESSAGES: :[[@LINE-1]]:8: warning: narrowing conversion from 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f = narrow_double_to_float_return();
+}
+
+void narrow_fp_constants() {
+  float f;
+  f = 0.5; // [dcl.init.list] 7.2 : in-range fp constant to narrower float is not a narrowing.
+
+  f = __builtin_huge_valf();  // max float is not narrowing.
+  f = -__builtin_huge_valf(); // -max float is not narrowing.
+  f = __builtin_inff();       // float infinity is not narrowing.
+  f = __builtin_nanf("0");    // float NaN is not narrowing.
+
+  f = __builtin_huge_val(); // max double is not within-range of float.
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from constant 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f = -__builtin_huge_val(); // -max double is not within-range of float.
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from constant 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f = __builtin_inf(); // double infinity is not within-range of float.
+  // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: narrowing conversion from constant 'double' to 'float' [cppcoreguidelines-narrowing-conversions]
+  f = __builtin_nan("0"); // double NaN is not narrowing.
+}
+
+} // namespace floats