// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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#include <stdlib.h>

#include "double-conversion/bignum-dtoa.h"

#include "cctest.h"
#include "gay-fixed.h"
#include "gay-precision.h"
#include "gay-shortest.h"
#include "gay-shortest-single.h"
#include "double-conversion/ieee.h"
#include "double-conversion/utils.h"

using namespace double_conversion;


// Removes trailing '0' digits.
// Can return the empty string if all digits are 0.
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';
}


static const int kBufferSize = 100;


TEST(BignumDtoaVariousDoubles) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  BignumDtoa(1.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("1", buffer.start());
  CHECK_EQ(1, point);

  BignumDtoa(1.0, BIGNUM_DTOA_FIXED, 3, buffer, &length, &point);
  CHECK_GE(3, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("1", buffer.start());
  CHECK_EQ(1, point);

  BignumDtoa(1.0, BIGNUM_DTOA_PRECISION, 3, buffer, &length, &point);
  CHECK_GE(3, length);
  TrimRepresentation(buffer);
  CHECK_EQ("1", buffer.start());
  CHECK_EQ(1, point);

  BignumDtoa(1.5, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("15", buffer.start());
  CHECK_EQ(1, point);

  BignumDtoa(1.5, BIGNUM_DTOA_FIXED, 10, buffer, &length, &point);
  CHECK_GE(10, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("15", buffer.start());
  CHECK_EQ(1, point);

  BignumDtoa(1.5, BIGNUM_DTOA_PRECISION, 10, buffer, &length, &point);
  CHECK_GE(10, length);
  TrimRepresentation(buffer);
  CHECK_EQ("15", buffer.start());
  CHECK_EQ(1, point);

  double min_double = 5e-324;
  BignumDtoa(min_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("5", buffer.start());
  CHECK_EQ(-323, point);

  BignumDtoa(min_double, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
  CHECK_GE(5, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("", buffer.start());

  BignumDtoa(min_double, BIGNUM_DTOA_PRECISION, 5, buffer, &length, &point);
  CHECK_GE(5, length);
  TrimRepresentation(buffer);
  CHECK_EQ("49407", buffer.start());
  CHECK_EQ(-323, point);

  double max_double = 1.7976931348623157e308;
  BignumDtoa(max_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("17976931348623157", buffer.start());
  CHECK_EQ(309, point);

  BignumDtoa(max_double, BIGNUM_DTOA_PRECISION, 7, buffer, &length, &point);
  CHECK_GE(7, length);
  TrimRepresentation(buffer);
  CHECK_EQ("1797693", buffer.start());
  CHECK_EQ(309, point);

  BignumDtoa(4294967272.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("4294967272", buffer.start());
  CHECK_EQ(10, point);

  BignumDtoa(4294967272.0, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
  CHECK_EQ("429496727200000", buffer.start());
  CHECK_EQ(10, point);


  BignumDtoa(4294967272.0, BIGNUM_DTOA_PRECISION, 14, buffer, &length, &point);
  CHECK_GE(14, length);
  TrimRepresentation(buffer);
  CHECK_EQ("4294967272", buffer.start());
  CHECK_EQ(10, point);

  BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("4185580496821357", buffer.start());
  CHECK_EQ(299, point);

  BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_PRECISION, 20,
             buffer, &length, &point);
  CHECK_GE(20, length);
  TrimRepresentation(buffer);
  CHECK_EQ("41855804968213567225", buffer.start());
  CHECK_EQ(299, point);

  BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("5562684646268003", buffer.start());
  CHECK_EQ(-308, point);

  BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_PRECISION, 1,
             buffer, &length, &point);
  CHECK_GE(1, length);
  TrimRepresentation(buffer);
  CHECK_EQ("6", buffer.start());
  CHECK_EQ(-308, point);

  BignumDtoa(2147483648.0, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("2147483648", buffer.start());
  CHECK_EQ(10, point);


  BignumDtoa(2147483648.0, BIGNUM_DTOA_FIXED, 2,
             buffer, &length, &point);
  CHECK_GE(2, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("2147483648", buffer.start());
  CHECK_EQ(10, point);

  BignumDtoa(2147483648.0, BIGNUM_DTOA_PRECISION, 5,
             buffer, &length, &point);
  CHECK_GE(5, length);
  TrimRepresentation(buffer);
  CHECK_EQ("21475", buffer.start());
  CHECK_EQ(10, point);

  BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("35844466002796428", buffer.start());
  CHECK_EQ(299, point);

  BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_PRECISION, 10,
             buffer, &length, &point);
  CHECK_GE(10, length);
  TrimRepresentation(buffer);
  CHECK_EQ("35844466", buffer.start());
  CHECK_EQ(299, point);

  BignumDtoa(1e-23, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("1", buffer.start());
  CHECK_EQ(-22, point);

  uint64_t smallest_normal64 = DOUBLE_CONVERSION_UINT64_2PART_C(0x00100000, 00000000);
  double v = Double(smallest_normal64).value();
  BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("22250738585072014", buffer.start());
  CHECK_EQ(-307, point);

  BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point);
  CHECK_GE(20, length);
  TrimRepresentation(buffer);
  CHECK_EQ("22250738585072013831", buffer.start());
  CHECK_EQ(-307, point);

  uint64_t largest_denormal64 = DOUBLE_CONVERSION_UINT64_2PART_C(0x000FFFFF, FFFFFFFF);
  v = Double(largest_denormal64).value();
  BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("2225073858507201", buffer.start());
  CHECK_EQ(-307, point);

  BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point);
  CHECK_GE(20, length);
  TrimRepresentation(buffer);
  CHECK_EQ("2225073858507200889", buffer.start());
  CHECK_EQ(-307, point);

  BignumDtoa(4128420500802942e-24, BIGNUM_DTOA_SHORTEST, 0,
             buffer, &length, &point);
  CHECK_EQ("4128420500802942", buffer.start());
  CHECK_EQ(-8, point);

  v = 3.9292015898194142585311918e-10;
  BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
  CHECK_EQ("39292015898194143", buffer.start());

  v = 4194304.0;
  BignumDtoa(v, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point);
  CHECK_GE(5, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("4194304", buffer.start());

  v = 3.3161339052167390562200598e-237;
  BignumDtoa(v, BIGNUM_DTOA_PRECISION, 19, buffer, &length, &point);
  CHECK_GE(19, length);
  TrimRepresentation(buffer);
  CHECK_EQ("3316133905216739056", buffer.start());
  CHECK_EQ(-236, point);

  v = 7.9885183916008099497815232e+191;
  BignumDtoa(v, BIGNUM_DTOA_PRECISION, 4, buffer, &length, &point);
  CHECK_GE(4, length);
  TrimRepresentation(buffer);
  CHECK_EQ("7989", buffer.start());
  CHECK_EQ(192, point);

  v = 1.0000000000000012800000000e+17;
  BignumDtoa(v, BIGNUM_DTOA_FIXED, 1, buffer, &length, &point);
  CHECK_GE(1, length - point);
  TrimRepresentation(buffer);
  CHECK_EQ("100000000000000128", buffer.start());
  CHECK_EQ(18, point);
}


TEST(BignumDtoaShortestVariousFloats) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  float min_float = 1e-45f;
  BignumDtoa(min_float, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("1", buffer.start());
  CHECK_EQ(-44, point);


  float max_float = 3.4028234e38f;
  BignumDtoa(max_float, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("34028235", buffer.start());
  CHECK_EQ(39, point);

  BignumDtoa(4294967272.0f, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("42949673", buffer.start());
  CHECK_EQ(10, point);

  BignumDtoa(3.32306998946228968226e+35f, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("332307", buffer.start());
  CHECK_EQ(36, point);

  BignumDtoa(1.2341e-41f, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("12341", buffer.start());
  CHECK_EQ(-40, point);

  BignumDtoa(3.3554432e7, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("33554432", buffer.start());
  CHECK_EQ(8, point);

  BignumDtoa(3.26494756798464e14f, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("32649476", buffer.start());
  CHECK_EQ(15, point);

  BignumDtoa(3.91132223637771935344e37f, BIGNUM_DTOA_SHORTEST_SINGLE, 0,
             buffer, &length, &point);
  CHECK_EQ("39113222", buffer.start());
  CHECK_EQ(38, point);

  uint32_t smallest_normal32 = 0x00800000;
  double v = Single(smallest_normal32).value();
  BignumDtoa(v, BIGNUM_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
  CHECK_EQ("11754944", buffer.start());
  CHECK_EQ(-37, point);

  uint32_t largest_denormal32 = 0x007FFFFF;
  v = Single(largest_denormal32).value();
  BignumDtoa(v, BIGNUM_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
  CHECK_EQ("11754942", buffer.start());
  CHECK_EQ(-37, point);
}


TEST(BignumDtoaGayShortest) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  Vector<const PrecomputedShortest> precomputed =
      PrecomputedShortestRepresentations();
  for (int i = 0; i < precomputed.length(); ++i) {
    const PrecomputedShortest current_test = precomputed[i];
    double v = current_test.v;
    BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point);
    CHECK_EQ(current_test.decimal_point, point);
    CHECK_EQ(current_test.representation, buffer.start());
  }
}


TEST(BignumDtoaGayShortestSingle) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  Vector<const PrecomputedShortestSingle> precomputed =
      PrecomputedShortestSingleRepresentations();
  for (int i = 0; i < precomputed.length(); ++i) {
    const PrecomputedShortestSingle current_test = precomputed[i];
    float v = current_test.v;
    BignumDtoa(v, BIGNUM_DTOA_SHORTEST_SINGLE, 0, buffer, &length, &point);
    CHECK_EQ(current_test.decimal_point, point);
    CHECK_EQ(current_test.representation, buffer.start());
  }
}


TEST(BignumDtoaGayFixed) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  Vector<const PrecomputedFixed> precomputed =
      PrecomputedFixedRepresentations();
  for (int i = 0; i < precomputed.length(); ++i) {
    const PrecomputedFixed current_test = precomputed[i];
    double v = current_test.v;
    int number_digits = current_test.number_digits;
    BignumDtoa(v, BIGNUM_DTOA_FIXED, number_digits, buffer, &length, &point);
    CHECK_EQ(current_test.decimal_point, point);
    CHECK_GE(number_digits, length - point);
    TrimRepresentation(buffer);
    CHECK_EQ(current_test.representation, buffer.start());
  }
}


TEST(BignumDtoaGayPrecision) {
  char buffer_container[kBufferSize];
  Vector<char> buffer(buffer_container, kBufferSize);
  int length;
  int point;

  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;
    BignumDtoa(v, BIGNUM_DTOA_PRECISION, number_digits,
               buffer, &length, &point);
    CHECK_EQ(current_test.decimal_point, point);
    CHECK_GE(number_digits, length);
    TrimRepresentation(buffer);
    CHECK_EQ(current_test.representation, buffer.start());
  }
}
