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ALLOCA_N: do not use RUBY_ALIGNOF

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Now that RUBY_ALIGNOF behaves like C11's _Alignof.  This is not
necessarily the best stack arrangement.  We can just give up using
__builtin_alloca_with_align(), and let alloca choose what is optimal.
This commit is contained in:
卜部昌平 2020-09-23 13:30:56 +09:00
parent e9fb2bc873
commit 873fb1aa4c
Notes: git 2020-09-25 11:39:05 +09:00
1 changed files with 1 additions and 11 deletions
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12
include/ruby/internal/memory.h
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@ -109,18 +109,8 @@ extern void *alloca();
#define RB_REALLOC_N(var,type,n) \ #define RB_REALLOC_N(var,type,n) \
((var) = RBIMPL_CAST((type *)ruby_xrealloc2((void *)(var), (n), sizeof(type)))) ((var) = RBIMPL_CAST((type *)ruby_xrealloc2((void *)(var), (n), sizeof(type))))
/* I don't know why but __builtin_alloca_with_align's second argument #define ALLOCA_N(type,n) \
takes bits rather than bytes. */
#if RBIMPL_HAS_BUILTIN(__builtin_alloca_with_align)
# define ALLOCA_N(type, n) \
RBIMPL_CAST((type *) \
__builtin_alloca_with_align( \
rbimpl_size_mul_or_raise(sizeof(type), (n)), \
RUBY_ALIGNOF(type) * CHAR_BIT))
#else
# define ALLOCA_N(type,n) \
RBIMPL_CAST((type *)alloca(rbimpl_size_mul_or_raise(sizeof(type), (n)))) RBIMPL_CAST((type *)alloca(rbimpl_size_mul_or_raise(sizeof(type), (n))))
#endif
/* allocates _n_ bytes temporary buffer and stores VALUE including it /* allocates _n_ bytes temporary buffer and stores VALUE including it
* in _v_. _n_ may be evaluated twice. */ * in _v_. _n_ may be evaluated twice. */