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-rw-r--r--deps/v8/test/cctest/test-fast-dtoa.cc183
1 files changed, 172 insertions, 11 deletions
diff --git a/deps/v8/test/cctest/test-fast-dtoa.cc b/deps/v8/test/cctest/test-fast-dtoa.cc
index 19f5cffb52..30d247658c 100644
--- a/deps/v8/test/cctest/test-fast-dtoa.cc
+++ b/deps/v8/test/cctest/test-fast-dtoa.cc
@@ -9,13 +9,26 @@
#include "diy-fp.h"
#include "double.h"
#include "fast-dtoa.h"
+#include "gay-precision.h"
#include "gay-shortest.h"
using namespace v8::internal;
static const int kBufferSize = 100;
-TEST(FastDtoaVariousDoubles) {
+
+// 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;
@@ -23,38 +36,45 @@ TEST(FastDtoaVariousDoubles) {
int status;
double min_double = 5e-324;
- status = FastDtoa(min_double, buffer, &length, &point);
+ 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, buffer, &length, &point);
+ 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, buffer, &length, &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, buffer, &length, &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, buffer, &length, &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, buffer, &length, &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, buffer, &length, &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);
@@ -62,7 +82,7 @@ TEST(FastDtoaVariousDoubles) {
uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000);
double v = Double(smallest_normal64).value();
- status = FastDtoa(v, buffer, &length, &point);
+ status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
if (status) {
CHECK_EQ("22250738585072014", buffer.start());
CHECK_EQ(-307, point);
@@ -70,7 +90,7 @@ TEST(FastDtoaVariousDoubles) {
uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
v = Double(largest_denormal64).value();
- status = FastDtoa(v, buffer, &length, &point);
+ status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
if (status) {
CHECK_EQ("2225073858507201", buffer.start());
CHECK_EQ(-307, point);
@@ -78,6 +98,107 @@ TEST(FastDtoaVariousDoubles) {
}
+TEST(FastDtoaPrecisionVariousDoubles) {
+ char buffer_container[kBufferSize];
+ Vector<char> buffer(buffer_container, kBufferSize);
+ int length;
+ int point;
+ int status;
+
+ status = FastDtoa(1.0, FAST_DTOA_PRECISION, 3, buffer, &length, &point);
+ CHECK(status);
+ CHECK_GE(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_GE(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_GE(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_GE(10, length);
+ TrimRepresentation(buffer);
+ CHECK_EQ("35844466", buffer.start());
+ CHECK_EQ(299, point);
+
+ uint64_t smallest_normal64 = V8_2PART_UINT64_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 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF);
+ v = Double(largest_denormal64).value();
+ status = FastDtoa(v, FAST_DTOA_PRECISION, 17, buffer, &length, &point);
+ CHECK(status);
+ CHECK_GE(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);
@@ -94,7 +215,7 @@ TEST(FastDtoaGayShortest) {
const PrecomputedShortest current_test = precomputed[i];
total++;
double v = current_test.v;
- status = FastDtoa(v, buffer, &length, &point);
+ status = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, &length, &point);
CHECK_GE(kFastDtoaMaximalLength, length);
if (!status) continue;
if (length == kFastDtoaMaximalLength) needed_max_length = true;
@@ -105,3 +226,43 @@ TEST(FastDtoaGayShortest) {
CHECK_GT(succeeded*1.0/total, 0.99);
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_GE(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_GT(succeeded*1.0/total, 0.85);
+ // However with less than 15 digits almost the algorithm should almost always
+ // succeed.
+ CHECK_GT(succeeded_15*1.0/total_15, 0.9999);
+}
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