1 files changed, 60 insertions, 0 deletions
diff --git a/lib/std/special/compiler_rt/floattisf_test.zig b/lib/std/special/compiler_rt/floattisf_test.zig
new file mode 100644
index 0000000000..a6aa115307
--- /dev/null
+++ b/lib/std/special/compiler_rt/floattisf_test.zig
@@ -0,0 +1,60 @@
+const __floattisf = @import("floattisf.zig").__floattisf;
+const testing = @import("std").testing;
+
+fn test__floattisf(a: i128, expected: f32) void {
+    const x = __floattisf(a);
+    testing.expect(x == expected);
+}
+
+test "floattisf" {
+    test__floattisf(0, 0.0);
+
+    test__floattisf(1, 1.0);
+    test__floattisf(2, 2.0);
+    test__floattisf(-1, -1.0);
+    test__floattisf(-2, -2.0);
+
+    test__floattisf(0x7FFFFF8000000000, 0x1.FFFFFEp+62);
+    test__floattisf(0x7FFFFF0000000000, 0x1.FFFFFCp+62);
+
+    test__floattisf(make_ti(0xFFFFFFFFFFFFFFFF, 0x8000008000000000), -0x1.FFFFFEp+62);
+    test__floattisf(make_ti(0xFFFFFFFFFFFFFFFF, 0x8000010000000000), -0x1.FFFFFCp+62);
+
+    test__floattisf(make_ti(0xFFFFFFFFFFFFFFFF, 0x8000000000000000), -0x1.000000p+63);
+    test__floattisf(make_ti(0xFFFFFFFFFFFFFFFF, 0x8000000000000001), -0x1.000000p+63);
+
+    test__floattisf(0x0007FB72E8000000, 0x1.FEDCBAp+50);
+
+    test__floattisf(0x0007FB72EA000000, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72EB000000, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72EBFFFFFF, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72EC000000, 0x1.FEDCBCp+50);
+    test__floattisf(0x0007FB72E8000001, 0x1.FEDCBAp+50);
+
+    test__floattisf(0x0007FB72E6000000, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72E7000000, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72E7FFFFFF, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72E4000001, 0x1.FEDCBAp+50);
+    test__floattisf(0x0007FB72E4000000, 0x1.FEDCB8p+50);
+
+    test__floattisf(make_ti(0x0007FB72E8000000, 0), 0x1.FEDCBAp+114);
+
+    test__floattisf(make_ti(0x0007FB72EA000000, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72EB000000, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72EBFFFFFF, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72EC000000, 0), 0x1.FEDCBCp+114);
+    test__floattisf(make_ti(0x0007FB72E8000001, 0), 0x1.FEDCBAp+114);
+
+    test__floattisf(make_ti(0x0007FB72E6000000, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72E7000000, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72E7FFFFFF, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72E4000001, 0), 0x1.FEDCBAp+114);
+    test__floattisf(make_ti(0x0007FB72E4000000, 0), 0x1.FEDCB8p+114);
+}
+
+fn make_ti(high: u64, low: u64) i128 {
+    var result: u128 = high;
+    result <<= 64;
+    result |= low;
+    return @bitCast(i128, result);
+}