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v8/src/cached-powers.cc
Clemens Hammacher 5f6510825a [cleanup] Fix remaining (D)CHECK macro usages 
This CL fixes all occurences that don't require special OWNER reviews,
or can be reviewed by Michi.

After this one, we should be able to reenable the readability/check
cpplint check.

R=mstarzinger@chromium.org

Bug: v8:6837, v8:6921
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng;master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: Ic81d68d5534eaa795b7197fed5c41ed158361d62
Reviewed-on: https://chromium-review.googlesource.com/721120
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48670}
2017-10-18 10:12:31 +00:00

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// Copyright 2011 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/cached-powers.h"
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <cmath>
#include "src/base/logging.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
struct CachedPower {
uint64_t significand;
int16_t binary_exponent;
int16_t decimal_exponent;
};
static const CachedPower kCachedPowers[] = {
{V8_2PART_UINT64_C(0xfa8fd5a0, 081c0288), -1220, -348},
{V8_2PART_UINT64_C(0xbaaee17f, a23ebf76), -1193, -340},
{V8_2PART_UINT64_C(0x8b16fb20, 3055ac76), -1166, -332},
{V8_2PART_UINT64_C(0xcf42894a, 5dce35ea), -1140, -324},
{V8_2PART_UINT64_C(0x9a6bb0aa, 55653b2d), -1113, -316},
{V8_2PART_UINT64_C(0xe61acf03, 3d1a45df), -1087, -308},
{V8_2PART_UINT64_C(0xab70fe17, c79ac6ca), -1060, -300},
{V8_2PART_UINT64_C(0xff77b1fc, bebcdc4f), -1034, -292},
{V8_2PART_UINT64_C(0xbe5691ef, 416bd60c), -1007, -284},
{V8_2PART_UINT64_C(0x8dd01fad, 907ffc3c), -980, -276},
{V8_2PART_UINT64_C(0xd3515c28, 31559a83), -954, -268},
{V8_2PART_UINT64_C(0x9d71ac8f, ada6c9b5), -927, -260},
{V8_2PART_UINT64_C(0xea9c2277, 23ee8bcb), -901, -252},
{V8_2PART_UINT64_C(0xaecc4991, 4078536d), -874, -244},
{V8_2PART_UINT64_C(0x823c1279, 5db6ce57), -847, -236},
{V8_2PART_UINT64_C(0xc2109436, 4dfb5637), -821, -228},
{V8_2PART_UINT64_C(0x9096ea6f, 3848984f), -794, -220},
{V8_2PART_UINT64_C(0xd77485cb, 25823ac7), -768, -212},
{V8_2PART_UINT64_C(0xa086cfcd, 97bf97f4), -741, -204},
{V8_2PART_UINT64_C(0xef340a98, 172aace5), -715, -196},
{V8_2PART_UINT64_C(0xb23867fb, 2a35b28e), -688, -188},
{V8_2PART_UINT64_C(0x84c8d4df, d2c63f3b), -661, -180},
{V8_2PART_UINT64_C(0xc5dd4427, 1ad3cdba), -635, -172},
{V8_2PART_UINT64_C(0x936b9fce, bb25c996), -608, -164},
{V8_2PART_UINT64_C(0xdbac6c24, 7d62a584), -582, -156},
{V8_2PART_UINT64_C(0xa3ab6658, 0d5fdaf6), -555, -148},
{V8_2PART_UINT64_C(0xf3e2f893, dec3f126), -529, -140},
{V8_2PART_UINT64_C(0xb5b5ada8, aaff80b8), -502, -132},
{V8_2PART_UINT64_C(0x87625f05, 6c7c4a8b), -475, -124},
{V8_2PART_UINT64_C(0xc9bcff60, 34c13053), -449, -116},
{V8_2PART_UINT64_C(0x964e858c, 91ba2655), -422, -108},
{V8_2PART_UINT64_C(0xdff97724, 70297ebd), -396, -100},
{V8_2PART_UINT64_C(0xa6dfbd9f, b8e5b88f), -369, -92},
{V8_2PART_UINT64_C(0xf8a95fcf, 88747d94), -343, -84},
{V8_2PART_UINT64_C(0xb9447093, 8fa89bcf), -316, -76},
{V8_2PART_UINT64_C(0x8a08f0f8, bf0f156b), -289, -68},
{V8_2PART_UINT64_C(0xcdb02555, 653131b6), -263, -60},
{V8_2PART_UINT64_C(0x993fe2c6, d07b7fac), -236, -52},
{V8_2PART_UINT64_C(0xe45c10c4, 2a2b3b06), -210, -44},
{V8_2PART_UINT64_C(0xaa242499, 697392d3), -183, -36},
{V8_2PART_UINT64_C(0xfd87b5f2, 8300ca0e), -157, -28},
{V8_2PART_UINT64_C(0xbce50864, 92111aeb), -130, -20},
{V8_2PART_UINT64_C(0x8cbccc09, 6f5088cc), -103, -12},
{V8_2PART_UINT64_C(0xd1b71758, e219652c), -77, -4},
{V8_2PART_UINT64_C(0x9c400000, 00000000), -50, 4},
{V8_2PART_UINT64_C(0xe8d4a510, 00000000), -24, 12},
{V8_2PART_UINT64_C(0xad78ebc5, ac620000), 3, 20},
{V8_2PART_UINT64_C(0x813f3978, f8940984), 30, 28},
{V8_2PART_UINT64_C(0xc097ce7b, c90715b3), 56, 36},
{V8_2PART_UINT64_C(0x8f7e32ce, 7bea5c70), 83, 44},
{V8_2PART_UINT64_C(0xd5d238a4, abe98068), 109, 52},
{V8_2PART_UINT64_C(0x9f4f2726, 179a2245), 136, 60},
{V8_2PART_UINT64_C(0xed63a231, d4c4fb27), 162, 68},
{V8_2PART_UINT64_C(0xb0de6538, 8cc8ada8), 189, 76},
{V8_2PART_UINT64_C(0x83c7088e, 1aab65db), 216, 84},
{V8_2PART_UINT64_C(0xc45d1df9, 42711d9a), 242, 92},
{V8_2PART_UINT64_C(0x924d692c, a61be758), 269, 100},
{V8_2PART_UINT64_C(0xda01ee64, 1a708dea), 295, 108},
{V8_2PART_UINT64_C(0xa26da399, 9aef774a), 322, 116},
{V8_2PART_UINT64_C(0xf209787b, b47d6b85), 348, 124},
{V8_2PART_UINT64_C(0xb454e4a1, 79dd1877), 375, 132},
{V8_2PART_UINT64_C(0x865b8692, 5b9bc5c2), 402, 140},
{V8_2PART_UINT64_C(0xc83553c5, c8965d3d), 428, 148},
{V8_2PART_UINT64_C(0x952ab45c, fa97a0b3), 455, 156},
{V8_2PART_UINT64_C(0xde469fbd, 99a05fe3), 481, 164},
{V8_2PART_UINT64_C(0xa59bc234, db398c25), 508, 172},
{V8_2PART_UINT64_C(0xf6c69a72, a3989f5c), 534, 180},
{V8_2PART_UINT64_C(0xb7dcbf53, 54e9bece), 561, 188},
{V8_2PART_UINT64_C(0x88fcf317, f22241e2), 588, 196},
{V8_2PART_UINT64_C(0xcc20ce9b, d35c78a5), 614, 204},
{V8_2PART_UINT64_C(0x98165af3, 7b2153df), 641, 212},
{V8_2PART_UINT64_C(0xe2a0b5dc, 971f303a), 667, 220},
{V8_2PART_UINT64_C(0xa8d9d153, 5ce3b396), 694, 228},
{V8_2PART_UINT64_C(0xfb9b7cd9, a4a7443c), 720, 236},
{V8_2PART_UINT64_C(0xbb764c4c, a7a44410), 747, 244},
{V8_2PART_UINT64_C(0x8bab8eef, b6409c1a), 774, 252},
{V8_2PART_UINT64_C(0xd01fef10, a657842c), 800, 260},
{V8_2PART_UINT64_C(0x9b10a4e5, e9913129), 827, 268},
{V8_2PART_UINT64_C(0xe7109bfb, a19c0c9d), 853, 276},
{V8_2PART_UINT64_C(0xac2820d9, 623bf429), 880, 284},
{V8_2PART_UINT64_C(0x80444b5e, 7aa7cf85), 907, 292},
{V8_2PART_UINT64_C(0xbf21e440, 03acdd2d), 933, 300},
{V8_2PART_UINT64_C(0x8e679c2f, 5e44ff8f), 960, 308},
{V8_2PART_UINT64_C(0xd433179d, 9c8cb841), 986, 316},
{V8_2PART_UINT64_C(0x9e19db92, b4e31ba9), 1013, 324},
{V8_2PART_UINT64_C(0xeb96bf6e, badf77d9), 1039, 332},
{V8_2PART_UINT64_C(0xaf87023b, 9bf0ee6b), 1066, 340},
};
#ifdef DEBUG
static const int kCachedPowersLength = arraysize(kCachedPowers);
#endif
static const int kCachedPowersOffset = 348; // -1 * the first decimal_exponent.
static const double kD_1_LOG2_10 = 0.30102999566398114; // 1 / lg(10)
// Difference between the decimal exponents in the table above.
const int PowersOfTenCache::kDecimalExponentDistance = 8;
const int PowersOfTenCache::kMinDecimalExponent = -348;
const int PowersOfTenCache::kMaxDecimalExponent = 340;
void PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
int min_exponent,
int max_exponent,
DiyFp* power,
int* decimal_exponent) {
int kQ = DiyFp::kSignificandSize;
// Some platforms return incorrect sign on 0 result. We can ignore that here,
// which means we can avoid depending on platform.h.
double k = std::ceil((min_exponent + kQ - 1) * kD_1_LOG2_10);
int foo = kCachedPowersOffset;
int index =
(foo + static_cast<int>(k) - 1) / kDecimalExponentDistance + 1;
DCHECK(0 <= index && index < kCachedPowersLength);
CachedPower cached_power = kCachedPowers[index];
DCHECK(min_exponent <= cached_power.binary_exponent);
DCHECK(cached_power.binary_exponent <= max_exponent);
*decimal_exponent = cached_power.decimal_exponent;
*power = DiyFp(cached_power.significand, cached_power.binary_exponent);
}
void PowersOfTenCache::GetCachedPowerForDecimalExponent(int requested_exponent,
DiyFp* power,
int* found_exponent) {
DCHECK_LE(kMinDecimalExponent, requested_exponent);
DCHECK(requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance);
int index =
(requested_exponent + kCachedPowersOffset) / kDecimalExponentDistance;
CachedPower cached_power = kCachedPowers[index];
*power = DiyFp(cached_power.significand, cached_power.binary_exponent);
*found_exponent = cached_power.decimal_exponent;
DCHECK(*found_exponent <= requested_exponent);
DCHECK(requested_exponent < *found_exponent + kDecimalExponentDistance);
}
} // namespace internal
} // namespace v8
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