1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef V8_CACHED_POWERS_H_
6 #define V8_CACHED_POWERS_H_
13 class PowersOfTenCache {
15 // Not all powers of ten are cached. The decimal exponent of two neighboring
16 // cached numbers will differ by kDecimalExponentDistance.
17 static const int kDecimalExponentDistance;
19 static const int kMinDecimalExponent;
20 static const int kMaxDecimalExponent;
22 // Returns a cached power-of-ten with a binary exponent in the range
23 // [min_exponent; max_exponent] (boundaries included).
24 static void GetCachedPowerForBinaryExponentRange(int min_exponent,
27 int* decimal_exponent);
29 // Returns a cached power of ten x ~= 10^k such that
30 // k <= decimal_exponent < k + kCachedPowersDecimalDistance.
31 // The given decimal_exponent must satisfy
32 // kMinDecimalExponent <= requested_exponent, and
33 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
34 static void GetCachedPowerForDecimalExponent(int requested_exponent,
39 } } // namespace v8::internal
41 #endif // V8_CACHED_POWERS_H_