v8/test/cctest/test-fast-dtoa.cc

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