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Optimize number-to-string conversion

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* Make constants static in `ecma_number_to_utf8_string`.
* Make `ecma_number_to_utf8_string` use early returns, and rewrite
  its self-recursion in case of negative numbers.
* Make the stringification of decimal exponent in
  `ecma_number_to_utf8_string` use `ecma_uint32_to_utf8_string`.

* Changed ERROL0 dtoa implementation to use the `double` type
  instead of `ecma_number_t`. Thus, even is `ecma_number_t` is 32
  bit wide, the algorithm works the same.
* Changed `ecma_number_to_decimal` to use the ERROL0 dtoa algorithm
  for 32-bit floats as well.
* Changed `ecma_number_to_decimal` to generate the decimal string
  representation of the mantissa instead of an `uint64_t` number.

* Changed `ecma_number_to_utf8_string` to make use of the already
  available string representation of the mantissa, generated now by
  `ecma_number_to_decimal`.
* Changed `ecma_number_to_utf8_string` not to use static arrays and
  variables for digit, "e", etc. generation.

* Changed all `Number.prototype.toXXX` implementations and the
  `ecma_builtin_number_prototype_helper_round` helper to make use
  of the already available string representation of the mantissa,
  generated now by `ecma_number_to_decimal`.
* Factored out the common stringification parts of all
  `Number.prototype.toXXX` implementations into a new helper
  `ecma_builtin_number_prototype_helper_to_string`.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
This commit is contained in:
Akos Kiss
2016-06-17 03:36:35 -07:00
committed by Zoltan Herczeg
parent 65542549af
commit 30fd549e7f
4 changed files with 306 additions and 613 deletions
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jerry-core/ecma/base/ecma-helpers.h
+2 -4
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@@ -217,7 +217,7 @@ extern ecma_number_t ecma_number_add (ecma_number_t, ecma_number_t);
extern ecma_number_t ecma_number_substract (ecma_number_t, ecma_number_t);
extern ecma_number_t ecma_number_multiply (ecma_number_t, ecma_number_t);
extern ecma_number_t ecma_number_divide (ecma_number_t, ecma_number_t);
extern void ecma_number_to_decimal (ecma_number_t, uint64_t *, int32_t *, int32_t *);
extern lit_utf8_size_t ecma_number_to_decimal (ecma_number_t, lit_utf8_byte_t *, int32_t *);
/* ecma-helpers-values-collection.c */
extern ecma_collection_header_t *ecma_new_values_collection (const ecma_value_t[], ecma_length_t, bool);
@@ -327,9 +327,7 @@ extern int32_t ecma_number_to_int32 (ecma_number_t);
extern lit_utf8_size_t ecma_number_to_utf8_string (ecma_number_t, lit_utf8_byte_t *, lit_utf8_size_t);
/* ecma-helpers-errol.c */
#if CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64
extern uint64_t ecma_errol0_dtoa (ecma_number_t, int32_t *, int32_t *);
#endif /* CONFIG_ECMA_NUMBER_TYPE == CONFIG_ECMA_NUMBER_FLOAT64 */
extern lit_utf8_size_t ecma_errol0_dtoa (double, lit_utf8_byte_t *, int32_t *);
/**
* @}