1 files changed, 34 insertions, 0 deletions
diff --git a/lib/std/special/compiler_rt/divdf3_test.zig b/lib/std/special/compiler_rt/divdf3_test.zig
new file mode 100644
index 0000000000..61d6731ea7
--- /dev/null
+++ b/lib/std/special/compiler_rt/divdf3_test.zig
@@ -0,0 +1,34 @@
+// Ported from:
+//
+// https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divdf3_test.c
+
+const __divdf3 = @import("divdf3.zig").__divdf3;
+const testing = @import("std").testing;
+
+fn compareResultD(result: f64, expected: u64) bool {
+    const rep = @bitCast(u64, result);
+
+    if (rep == expected) {
+        return true;
+    }
+    // test other possible NaN representation(signal NaN)
+    else if (expected == 0x7ff8000000000000) {
+        if ((rep & 0x7ff0000000000000) == 0x7ff0000000000000 and
+            (rep & 0xfffffffffffff) > 0)
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+fn test__divdf3(a: f64, b: f64, expected: u64) void {
+    const x = __divdf3(a, b);
+    const ret = compareResultD(x, expected);
+    testing.expect(ret == true);
+}
+
+test "divdf3" {
+    test__divdf3(1.0, 3.0, 0x3fd5555555555555);
+    test__divdf3(4.450147717014403e-308, 2.0, 0x10000000000000);
+}