1 files changed, 39 insertions, 0 deletions
diff --git a/lib/std/special/compiler_rt/fixunsdfsi_test.zig b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
new file mode 100644
index 0000000000..c006473fb9
--- /dev/null
+++ b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
@@ -0,0 +1,39 @@
+const __fixunsdfsi = @import("fixunsdfsi.zig").__fixunsdfsi;
+const testing = @import("std").testing;
+
+fn test__fixunsdfsi(a: f64, expected: u32) void {
+    const x = __fixunsdfsi(a);
+    testing.expect(x == expected);
+}
+
+test "fixunsdfsi" {
+    test__fixunsdfsi(0.0, 0);
+
+    test__fixunsdfsi(0.5, 0);
+    test__fixunsdfsi(0.99, 0);
+    test__fixunsdfsi(1.0, 1);
+    test__fixunsdfsi(1.5, 1);
+    test__fixunsdfsi(1.99, 1);
+    test__fixunsdfsi(2.0, 2);
+    test__fixunsdfsi(2.01, 2);
+    test__fixunsdfsi(-0.5, 0);
+    test__fixunsdfsi(-0.99, 0);
+    test__fixunsdfsi(-1.0, 0);
+    test__fixunsdfsi(-1.5, 0);
+    test__fixunsdfsi(-1.99, 0);
+    test__fixunsdfsi(-2.0, 0);
+    test__fixunsdfsi(-2.01, 0);
+
+    test__fixunsdfsi(0x1.000000p+31, 0x80000000);
+    test__fixunsdfsi(0x1.000000p+32, 0xFFFFFFFF);
+    test__fixunsdfsi(0x1.FFFFFEp+31, 0xFFFFFF00);
+    test__fixunsdfsi(0x1.FFFFFEp+30, 0x7FFFFF80);
+    test__fixunsdfsi(0x1.FFFFFCp+30, 0x7FFFFF00);
+
+    test__fixunsdfsi(-0x1.FFFFFEp+30, 0);
+    test__fixunsdfsi(-0x1.FFFFFCp+30, 0);
+
+    test__fixunsdfsi(0x1.FFFFFFFEp+31, 0xFFFFFFFF);
+    test__fixunsdfsi(0x1.FFFFFFFC00000p+30, 0x7FFFFFFF);
+    test__fixunsdfsi(0x1.FFFFFFF800000p+30, 0x7FFFFFFE);
+}