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107 lines
3.0 KiB
107 lines
3.0 KiB
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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#include <stdlib.h>
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#include "v8.h"
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#include "platform.h"
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#include "cctest.h"
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#include "diy-fp.h"
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#include "double.h"
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#include "fast-dtoa.h"
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#include "gay-shortest.h"
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using namespace v8::internal;
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static const int kBufferSize = 100;
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TEST(FastDtoaVariousDoubles) {
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char buffer_container[kBufferSize];
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Vector<char> buffer(buffer_container, kBufferSize);
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int length;
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int point;
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int status;
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double min_double = 5e-324;
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status = FastDtoa(min_double, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("5", buffer.start());
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CHECK_EQ(-323, point);
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double max_double = 1.7976931348623157e308;
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status = FastDtoa(max_double, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("17976931348623157", buffer.start());
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CHECK_EQ(309, point);
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status = FastDtoa(4294967272.0, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("4294967272", buffer.start());
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CHECK_EQ(10, point);
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status = FastDtoa(4.1855804968213567e298, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("4185580496821357", buffer.start());
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CHECK_EQ(299, point);
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status = FastDtoa(5.5626846462680035e-309, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("5562684646268003", buffer.start());
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CHECK_EQ(-308, point);
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status = FastDtoa(2147483648.0, buffer, &length, &point);
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CHECK(status);
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CHECK_EQ("2147483648", buffer.start());
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CHECK_EQ(10, point);
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status = FastDtoa(3.5844466002796428e+298, buffer, &length, &point);
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if (status) { // Not all FastDtoa variants manage to compute this number.
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CHECK_EQ("35844466002796428", buffer.start());
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CHECK_EQ(299, point);
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}
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uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000);
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double v = Double(smallest_normal64).value();
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status = FastDtoa(v, buffer, &length, &point);
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if (status) {
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CHECK_EQ("22250738585072014", buffer.start());
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CHECK_EQ(-307, point);
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}
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uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
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v = Double(largest_denormal64).value();
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status = FastDtoa(v, buffer, &length, &point);
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if (status) {
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CHECK_EQ("2225073858507201", buffer.start());
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CHECK_EQ(-307, point);
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}
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}
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TEST(FastDtoaGayShortest) {
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char buffer_container[kBufferSize];
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Vector<char> buffer(buffer_container, kBufferSize);
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bool status;
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int length;
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int point;
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int succeeded = 0;
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int total = 0;
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bool needed_max_length = false;
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Vector<const PrecomputedShortest> precomputed =
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PrecomputedShortestRepresentations();
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for (int i = 0; i < precomputed.length(); ++i) {
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const PrecomputedShortest current_test = precomputed[i];
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total++;
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double v = current_test.v;
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status = FastDtoa(v, buffer, &length, &point);
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CHECK_GE(kFastDtoaMaximalLength, length);
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if (!status) continue;
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if (length == kFastDtoaMaximalLength) needed_max_length = true;
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succeeded++;
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CHECK_EQ(current_test.decimal_point, point);
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CHECK_EQ(current_test.representation, buffer.start());
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}
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CHECK_GT(succeeded*1.0/total, 0.99);
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CHECK(needed_max_length);
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}
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