#include <cached-powers.h>

Collaboration diagram for v8::internal::PowersOfTenCache:

Static Public Member Functions
static void	GetCachedPowerForBinaryExponentRange (int min_exponent, int max_exponent, DiyFp power, int decimal_exponent)

static void	GetCachedPowerForDecimalExponent (int requested_exponent, DiyFp power, int found_exponent)

Static Public Attributes
static const int	kDecimalExponentDistance = 8

static const int	kMinDecimalExponent = -348

static const int	kMaxDecimalExponent = 340

Detailed Description

Definition at line 14 of file cached-powers.h.

Member Function Documentation

◆ GetCachedPowerForBinaryExponentRange()

void v8::internal::PowersOfTenCache::GetCachedPowerForBinaryExponentRange	(	int	min_exponent,
		int	max_exponent,
		DiyFp *	power,
		int *	decimal_exponent
	)

static

Definition at line 124 of file cached-powers.cc.

                            {
   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);
 }

References v8::internal::CachedPower::binary_exponent, DCHECK, v8::internal::CachedPower::decimal_exponent, v8::internal::kCachedPowers, v8::internal::kCachedPowersOffset, v8::internal::kD_1_LOG2_10, kDecimalExponentDistance, v8::internal::DiyFp::kSignificandSize, and v8::internal::CachedPower::significand.

Referenced by v8::internal::Grisu3(), and v8::internal::Grisu3Counted().

Here is the caller graph for this function:

◆ GetCachedPowerForDecimalExponent()

void v8::internal::PowersOfTenCache::GetCachedPowerForDecimalExponent	(	int	requested_exponent,
		DiyFp *	power,
		int *	found_exponent
	)

static

Definition at line 145 of file cached-powers.cc.

                                                                              {
   DCHECK(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);
 }