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- // Copyright 2006-2008 the V8 project authors. All rights reserved.
- #include <stdlib.h>
- #include "cctest.h"
- #include "diy-fp.h"
- #include "fast-dtoa.h"
- #include "gay-precision.h"
- #include "gay-shortest.h"
- #include "gay-shortest-single.h"
- #include "ieee.h"
- #include "utils.h"
- using namespace double_conversion;
- static const int kBufferSize = 100;
- // Removes trailing '0' digits.
- static void TrimRepresentation(Vector<char> representation) {
- int len = strlen(representation.start());
- int i;
- for (i = len - 1; i >= 0; --i) {
- if (representation[i] != '0') break;
- }
- representation[i + 1] = '\0';
- }
- TEST(FastDtoaShortestVariousDoubles) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- int length;
- int point;
- bool status;
- double min_double = 5e-324;
- status = FastDtoa(min_double, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("5", buffer.start());
- CHECK_EQ(-323, point);
- double max_double = 1.7976931348623157e308;
- status = FastDtoa(max_double, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("17976931348623157", buffer.start());
- CHECK_EQ(309, point);
- status = FastDtoa(4294967272.0, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("4294967272", buffer.start());
- CHECK_EQ(10, point);
- status = FastDtoa(4.1855804968213567e298, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("4185580496821357", buffer.start());
- CHECK_EQ(299, point);
- status = FastDtoa(5.5626846462680035e-309, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("5562684646268003", buffer.start());
- CHECK_EQ(-308, point);
- status = FastDtoa(2147483648.0, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("2147483648", buffer.start());
- CHECK_EQ(10, point);
- status = FastDtoa(3.5844466002796428e+298, FAST_DTOA_SHORTEST, 0,
- buffer, &length, &point);
- if (status) { // Not all FastDtoa variants manage to compute this number.
- CHECK_EQ("35844466002796428", buffer.start());
- CHECK_EQ(299, point);
- }
- uint64_t smallest_normal64 = UINT64_2PART_C(0x00100000, 00000000);
- double v = Double(smallest_normal64).value();
- status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
- if (status) {
- CHECK_EQ("22250738585072014", buffer.start());
- CHECK_EQ(-307, point);
- }
- uint64_t largest_denormal64 = UINT64_2PART_C(0x000FFFFF, FFFFFFFF);
- v = Double(largest_denormal64).value();
- status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
- if (status) {
- CHECK_EQ("2225073858507201", buffer.start());
- CHECK_EQ(-307, point);
- }
- }
- TEST(FastDtoaShortestVariousFloats) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- int length;
- int point;
- bool status;
- float min_float = 1e-45f;
- status = FastDtoa(min_float, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("1", buffer.start());
- CHECK_EQ(-44, point);
- float max_float = 3.4028234e38f;
- status = FastDtoa(max_float, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("34028235", buffer.start());
- CHECK_EQ(39, point);
- status = FastDtoa(4294967272.0f, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("42949673", buffer.start());
- CHECK_EQ(10, point);
- status = FastDtoa(3.32306998946228968226e+35f, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("332307", buffer.start());
- CHECK_EQ(36, point);
- status = FastDtoa(1.2341e-41f, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("12341", buffer.start());
- CHECK_EQ(-40, point);
- status = FastDtoa(3.3554432e7, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("33554432", buffer.start());
- CHECK_EQ(8, point);
- status = FastDtoa(3.26494756798464e14f, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("32649476", buffer.start());
- CHECK_EQ(15, point);
- status = FastDtoa(3.91132223637771935344e37f, FAST_DTOA_SHORTEST_SINGLE, 0,
- buffer, &length, &point);
- if (status) { // Not all FastDtoa variants manage to compute this number.
- CHECK_EQ("39113222", buffer.start());
- CHECK_EQ(38, point);
- }
- uint32_t smallest_normal32 = 0x00800000;
- float v = Single(smallest_normal32).value();
- status = FastDtoa(v, FAST_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
- if (status) {
- CHECK_EQ("11754944", buffer.start());
- CHECK_EQ(-37, point);
- }
- uint32_t largest_denormal32 = 0x007FFFFF;
- v = Single(largest_denormal32).value();
- status = FastDtoa(v, FAST_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("11754942", buffer.start());
- CHECK_EQ(-37, point);
- }
- TEST(FastDtoaPrecisionVariousDoubles) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- int length;
- int point;
- bool status;
- status = FastDtoa(1.0, FAST_DTOA_PRECISION, 3, buffer, &length, &point);
- CHECK(status);
- CHECK(3 >= length);
- TrimRepresentation(buffer);
- CHECK_EQ("1", buffer.start());
- CHECK_EQ(1, point);
- status = FastDtoa(1.5, FAST_DTOA_PRECISION, 10, buffer, &length, &point);
- if (status) {
- CHECK(10 >= length);
- TrimRepresentation(buffer);
- CHECK_EQ("15", buffer.start());
- CHECK_EQ(1, point);
- }
- double min_double = 5e-324;
- status = FastDtoa(min_double, FAST_DTOA_PRECISION, 5,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("49407", buffer.start());
- CHECK_EQ(-323, point);
- double max_double = 1.7976931348623157e308;
- status = FastDtoa(max_double, FAST_DTOA_PRECISION, 7,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("1797693", buffer.start());
- CHECK_EQ(309, point);
- status = FastDtoa(4294967272.0, FAST_DTOA_PRECISION, 14,
- buffer, &length, &point);
- if (status) {
- CHECK(14 >= length);
- TrimRepresentation(buffer);
- CHECK_EQ("4294967272", buffer.start());
- CHECK_EQ(10, point);
- }
- status = FastDtoa(4.1855804968213567e298, FAST_DTOA_PRECISION, 17,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("41855804968213567", buffer.start());
- CHECK_EQ(299, point);
- status = FastDtoa(5.5626846462680035e-309, FAST_DTOA_PRECISION, 1,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("6", buffer.start());
- CHECK_EQ(-308, point);
- status = FastDtoa(2147483648.0, FAST_DTOA_PRECISION, 5,
- buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("21475", buffer.start());
- CHECK_EQ(10, point);
- status = FastDtoa(3.5844466002796428e+298, FAST_DTOA_PRECISION, 10,
- buffer, &length, &point);
- CHECK(status);
- CHECK(10 >= length);
- TrimRepresentation(buffer);
- CHECK_EQ("35844466", buffer.start());
- CHECK_EQ(299, point);
- uint64_t smallest_normal64 = UINT64_2PART_C(0x00100000, 00000000);
- double v = Double(smallest_normal64).value();
- status = FastDtoa(v, FAST_DTOA_PRECISION, 17, buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("22250738585072014", buffer.start());
- CHECK_EQ(-307, point);
- uint64_t largest_denormal64 = UINT64_2PART_C(0x000FFFFF, FFFFFFFF);
- v = Double(largest_denormal64).value();
- status = FastDtoa(v, FAST_DTOA_PRECISION, 17, buffer, &length, &point);
- CHECK(status);
- CHECK(20 >= length);
- TrimRepresentation(buffer);
- CHECK_EQ("22250738585072009", buffer.start());
- CHECK_EQ(-307, point);
- v = 3.3161339052167390562200598e-237;
- status = FastDtoa(v, FAST_DTOA_PRECISION, 18, buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("331613390521673906", buffer.start());
- CHECK_EQ(-236, point);
- v = 7.9885183916008099497815232e+191;
- status = FastDtoa(v, FAST_DTOA_PRECISION, 4, buffer, &length, &point);
- CHECK(status);
- CHECK_EQ("7989", buffer.start());
- CHECK_EQ(192, point);
- }
- TEST(FastDtoaGayShortest) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- bool status;
- int length;
- int point;
- int succeeded = 0;
- int total = 0;
- bool needed_max_length = false;
- Vector<const PrecomputedShortest> precomputed =
- PrecomputedShortestRepresentations();
- for (int i = 0; i < precomputed.length(); ++i) {
- const PrecomputedShortest current_test = precomputed[i];
- total++;
- double v = current_test.v;
- status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
- CHECK(kFastDtoaMaximalLength >= length);
- if (!status) continue;
- if (length == kFastDtoaMaximalLength) needed_max_length = true;
- succeeded++;
- CHECK_EQ(current_test.decimal_point, point);
- CHECK_EQ(current_test.representation, buffer.start());
- }
- CHECK(succeeded*1.0/total > 0.99);
- CHECK(needed_max_length);
- }
- TEST(FastDtoaGayShortestSingle) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- bool status;
- int length;
- int point;
- int succeeded = 0;
- int total = 0;
- bool needed_max_length = false;
- Vector<const PrecomputedShortestSingle> precomputed =
- PrecomputedShortestSingleRepresentations();
- for (int i = 0; i < precomputed.length(); ++i) {
- const PrecomputedShortestSingle current_test = precomputed[i];
- total++;
- float v = current_test.v;
- status = FastDtoa(v, FAST_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
- CHECK(kFastDtoaMaximalSingleLength >= length);
- if (!status) continue;
- if (length == kFastDtoaMaximalSingleLength) needed_max_length = true;
- succeeded++;
- CHECK_EQ(current_test.decimal_point, point);
- CHECK_EQ(current_test.representation, buffer.start());
- }
- CHECK(succeeded*1.0/total > 0.98);
- CHECK(needed_max_length);
- }
- TEST(FastDtoaGayPrecision) {
- char buffer_container[kBufferSize];
- Vector<char> buffer(buffer_container, kBufferSize);
- bool status;
- int length;
- int point;
- int succeeded = 0;
- int total = 0;
- // Count separately for entries with less than 15 requested digits.
- int succeeded_15 = 0;
- int total_15 = 0;
- Vector<const PrecomputedPrecision> precomputed =
- PrecomputedPrecisionRepresentations();
- for (int i = 0; i < precomputed.length(); ++i) {
- const PrecomputedPrecision current_test = precomputed[i];
- double v = current_test.v;
- int number_digits = current_test.number_digits;
- total++;
- if (number_digits <= 15) total_15++;
- status = FastDtoa(v, FAST_DTOA_PRECISION, number_digits,
- buffer, &length, &point);
- CHECK(number_digits >= length);
- if (!status) continue;
- succeeded++;
- if (number_digits <= 15) succeeded_15++;
- TrimRepresentation(buffer);
- CHECK_EQ(current_test.decimal_point, point);
- CHECK_EQ(current_test.representation, buffer.start());
- }
- // The precomputed numbers contain many entries with many requested
- // digits. These have a high failure rate and we therefore expect a lower
- // success rate than for the shortest representation.
- CHECK(succeeded*1.0/total > 0.85);
- // However with less than 15 digits almost the algorithm should almost always
- // succeed.
- CHECK(succeeded_15*1.0/total_15 > 0.9999);
- }
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