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internal.h: optimize rb_ary_new_from_args

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* internal.h (rb_ary_new_from_args): optimization by expanding
  arguments in caller to get rid of va_list if possible.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47858 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2014-10-09 07:53:54 +00:00
parent 9629e7efc1
commit 795b8b474c
2 changed files with 14 additions and 2 deletions
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2
array.c
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@ -499,7 +499,7 @@ rb_ary_new(void)
}
VALUE
rb_ary_new_from_args(long n, ...)
(rb_ary_new_from_args)(long n, ...)
{
va_list ar;
VALUE ary;

14
internal.h
View file

@ -63,7 +63,8 @@ extern "C" {
#define numberof(array) ((int)(sizeof(array) / sizeof((array)[0])))
#define STATIC_ASSERT(name, expr) typedef int static_assert_##name##_check[1 - 2*!(expr)]
#define STATIC_ASSERT_TYPE(name) static_assert_##name##_check
#define STATIC_ASSERT(name, expr) typedef int STATIC_ASSERT_TYPE(name)[1 - 2*!(expr)]
#define GCC_VERSION_SINCE(major, minor, patchlevel) \
(defined(__GNUC__) && !defined(__INTEL_COMPILER) && \
@ -509,6 +510,17 @@ VALUE rb_ary_last(int, const VALUE *, VALUE);
void rb_ary_set_len(VALUE, long);
void rb_ary_delete_same(VALUE, VALUE);
VALUE rb_ary_tmp_new_fill(long capa);
#ifdef __GNUC__
#define rb_ary_new_from_args(n, ...) \
__extension__ ({ \
const VALUE args_to_new_ary[] = {__VA_ARGS__}; \
if (__builtin_constant_p(n)) { \
STATIC_ASSERT(rb_ary_new_from_args, numberof(args_to_new_ary) == (n)); \
(void)sizeof(STATIC_ASSERT_TYPE(rb_ary_new_from_args)); /* suppress warnings by gcc 4.8 or later */ \
} \
rb_ary_new_from_values(numberof(args_to_new_ary), args_to_new_ary); \
})
#endif
/* bignum.c */
VALUE rb_big_fdiv(VALUE x, VALUE y);