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Unified Diff: src/cached-powers.h

Issue 3898007: Strtod fast-case that uses DiyFps and cached powers of ten. (Closed)
Patch Set: Strtod fast-case that uses DiyFps and cached powers of ten.... Created 10 years, 2 months ago
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Index: src/cached-powers.h
===================================================================
--- src/cached-powers.h (revision 5685)
+++ src/cached-powers.h (working copy)
@@ -33,11 +33,33 @@
namespace v8 {
namespace internal {
-void GetCachedPowerForBinaryExponentRange(int min_exponent,
- int max_exponent,
- DiyFp* power,
- int* decimal_exponent);
+class PowersOfTenCache {
+ public:
+ // Not all powers of ten are cached. The decimal exponent of two neighboring
+ // cached numbers will differ by kDecimalExponentDistance.
+ static const int kDecimalExponentDistance;
+
+ static const int kMinDecimalExponent;
+ static const int kMaxDecimalExponent;
+
+ // Returns a cached power-of-ten with a binary exponent in the range
+ // [min_exponent; max_exponent] (boundaries included).
+ static void GetCachedPowerForBinaryExponentRange(int min_exponent,
+ int max_exponent,
+ DiyFp* power,
+ int* decimal_exponent);
+
+ // Returns a cached power of ten x ~= 10^k such that
+ // k <= decimal_exponent < k + kCachedPowersDecimalDistance.
+ // The given decimal_exponent must satisfy
+ // kMinDecimalExponent <= requested_exponent, and
+ // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
+ static void GetCachedPowerForDecimalExponent(int requested_exponent,
+ DiyFp* power,
+ int* found_exponent);
+};
+
} } // namespace v8::internal
#endif // V8_CACHED_POWERS_H_
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