a0c3797461
TBR=bmeurer@chromium.org,leszeks@chromium.org Bug: v8:9247 Change-Id: I8d14d0192ea8c705f8274e8e61a162531826edb6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1624220 Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Hannes Payer <hpayer@chromium.org> Reviewed-by: Andreas Haas <ahaas@chromium.org> Cr-Commit-Position: refs/heads/master@{#61769}
116 lines
4.5 KiB
C++
116 lines
4.5 KiB
C++
// 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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#include <cmath>
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#include "src/execution/isolate.h"
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#include "src/heap/factory.h"
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#include "src/numbers/conversions.h"
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#include "src/objects/bigint.h"
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#include "src/objects/objects-inl.h"
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#include "test/unittests/test-utils.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace v8 {
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namespace internal {
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typedef TestWithIsolate BigIntWithIsolate;
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void Compare(Handle<BigInt> x, double value, ComparisonResult expected) {
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CHECK_EQ(expected, BigInt::CompareToDouble(x, value));
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}
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Handle<BigInt> NewFromInt(Isolate* isolate, int value) {
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Handle<Smi> smi_value = handle(Smi::FromInt(value), isolate);
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return BigInt::FromNumber(isolate, smi_value).ToHandleChecked();
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}
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TEST_F(BigIntWithIsolate, CompareToDouble) {
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Handle<BigInt> zero = NewFromInt(isolate(), 0);
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Handle<BigInt> one = NewFromInt(isolate(), 1);
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Handle<BigInt> minus_one = NewFromInt(isolate(), -1);
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// Non-finite doubles.
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Compare(zero, std::nan(""), ComparisonResult::kUndefined);
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Compare(one, INFINITY, ComparisonResult::kLessThan);
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Compare(one, -INFINITY, ComparisonResult::kGreaterThan);
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// Unequal sign.
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Compare(one, -1, ComparisonResult::kGreaterThan);
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Compare(minus_one, 1, ComparisonResult::kLessThan);
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// Cases involving zero.
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Compare(zero, 0, ComparisonResult::kEqual);
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Compare(zero, -0, ComparisonResult::kEqual);
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Compare(one, 0, ComparisonResult::kGreaterThan);
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Compare(minus_one, 0, ComparisonResult::kLessThan);
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Compare(zero, 1, ComparisonResult::kLessThan);
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Compare(zero, -1, ComparisonResult::kGreaterThan);
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// Small doubles.
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Compare(zero, 0.25, ComparisonResult::kLessThan);
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Compare(one, 0.5, ComparisonResult::kGreaterThan);
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Compare(one, -0.5, ComparisonResult::kGreaterThan);
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Compare(zero, -0.25, ComparisonResult::kGreaterThan);
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Compare(minus_one, -0.5, ComparisonResult::kLessThan);
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// Different bit lengths.
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Handle<BigInt> four = NewFromInt(isolate(), 4);
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Handle<BigInt> minus_five = NewFromInt(isolate(), -5);
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Compare(four, 3.9, ComparisonResult::kGreaterThan);
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Compare(four, 1.5, ComparisonResult::kGreaterThan);
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Compare(four, 8, ComparisonResult::kLessThan);
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Compare(four, 16, ComparisonResult::kLessThan);
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Compare(minus_five, -4.9, ComparisonResult::kLessThan);
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Compare(minus_five, -4, ComparisonResult::kLessThan);
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Compare(minus_five, -25, ComparisonResult::kGreaterThan);
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// Same bit length, difference in first digit.
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double big_double = 4428155326412785451008.0;
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Handle<BigInt> big =
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BigIntLiteral(isolate(), "0xF10D00000000000000").ToHandleChecked();
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Compare(big, big_double, ComparisonResult::kGreaterThan);
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big = BigIntLiteral(isolate(), "0xE00D00000000000000").ToHandleChecked();
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Compare(big, big_double, ComparisonResult::kLessThan);
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double other_double = -13758438578910658560.0;
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Handle<BigInt> other =
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BigIntLiteral(isolate(), "-0xBEEFC1FE00000000").ToHandleChecked();
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Compare(other, other_double, ComparisonResult::kGreaterThan);
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other = BigIntLiteral(isolate(), "-0xBEEFCBFE00000000").ToHandleChecked();
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Compare(other, other_double, ComparisonResult::kLessThan);
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// Same bit length, difference in non-first digit.
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big = BigIntLiteral(isolate(), "0xF00D00000000000001").ToHandleChecked();
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Compare(big, big_double, ComparisonResult::kGreaterThan);
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big = BigIntLiteral(isolate(), "0xF00A00000000000000").ToHandleChecked();
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Compare(big, big_double, ComparisonResult::kLessThan);
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other = BigIntLiteral(isolate(), "-0xBEEFCAFE00000001").ToHandleChecked();
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Compare(other, other_double, ComparisonResult::kLessThan);
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// Same bit length, difference in fractional part.
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Compare(one, 1.5, ComparisonResult::kLessThan);
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Compare(minus_one, -1.25, ComparisonResult::kGreaterThan);
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big = NewFromInt(isolate(), 0xF00D00);
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Compare(big, 15731968.125, ComparisonResult::kLessThan);
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Compare(big, 15731967.875, ComparisonResult::kGreaterThan);
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big = BigIntLiteral(isolate(), "0x123456789AB").ToHandleChecked();
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Compare(big, 1250999896491.125, ComparisonResult::kLessThan);
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// Equality!
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Compare(one, 1, ComparisonResult::kEqual);
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Compare(minus_one, -1, ComparisonResult::kEqual);
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big = BigIntLiteral(isolate(), "0xF00D00000000000000").ToHandleChecked();
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Compare(big, big_double, ComparisonResult::kEqual);
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Handle<BigInt> two_52 =
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BigIntLiteral(isolate(), "0x10000000000000").ToHandleChecked();
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Compare(two_52, 4503599627370496.0, ComparisonResult::kEqual);
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}
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} // namespace internal
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} // namespace v8
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