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51 lines
2.0 KiB
JavaScript
51 lines
2.0 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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function Check(bigint, number_string) {
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var number = Number(bigint);
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if (number_string.substring(0, 2) === "0x") {
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assertEquals(number_string.substring(2), number.toString(16));
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} else {
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assertEquals(number_string, number.toString());
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}
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}
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// Values in Smi range.
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Check(0n, "0");
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Check(1n, "1");
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Check(-1n, "-1");
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// Values in double range.
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Check(12345678912n, "12345678912");
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Check(-12345678912345n, "-12345678912345");
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Check(0xfffffffffffffn, "0xfffffffffffff"); // 52 bits.
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Check(0x1fffffffffffffn, "0x1fffffffffffff"); // 53 bits.
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Check(0x3fffffffffffffn, "0x40000000000000"); // 54 bits, rounding up.
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Check(0x3ffffffffffffen, "0x3ffffffffffffe"); // 54 bits, rounding down.
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Check(0x7ffffffffffffdn, "0x7ffffffffffffc"); // 55 bits, rounding down.
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Check(0x7ffffffffffffen, "0x80000000000000"); // 55 bits, tie to even.
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Check(0x7fffffffffffffn, "0x80000000000000"); // 55 bits, rounding up.
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Check(0x1ffff0000ffff0000n, "0x1ffff0000ffff0000"); // 65 bits.
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Check(100000000000000008192n, "100000000000000000000"); // Tie to even.
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// Check the cornercase where the most significant cut-off bit is 1.
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// If a digit beyond the mantissa is non-zero, we must round up;
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// otherwise tie to even.
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// ...digit2 ][ digit1 ][ digit0 ]
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// [ mantissa ]
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Check(0x01000000000000080000000000000000001000n,
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"0x1000000000000100000000000000000000000");
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Check(0x01000000000000080000000000000000000000n,
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"0x1000000000000000000000000000000000000");
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Check(0x01000000000000180000000000000000000000n,
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"0x1000000000000200000000000000000000000");
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// Values near infinity.
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Check(1n << 1024n, "Infinity");
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Check(-1n << 1024n, "-Infinity");
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Check(1n << 1023n, "8.98846567431158e+307");
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Check((1n << 1024n) - (1n << 972n), "1.7976931348623155e+308");
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Check((1n << 1024n) - (1n << 971n), "1.7976931348623157e+308");
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Check((1n << 1024n) - (1n << 970n), "Infinity"); // Rounding up overflows.
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