diff options
| author | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-01-15 02:35:19 +0000 |
|---|---|---|
| committer | shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-01-15 02:35:19 +0000 |
| commit | df9a70900a7380bc9b42b12ab90cf182988bcd45 (patch) | |
| tree | c0a4bf7a1b4a3819490ec9ef85296298578a1685 /include/ruby/ruby.h | |
| parent | 39cfa67b4f56e0c79afb352b1e9bf5c914b774ca (diff) | |
__builtin_alloca_with_align for optimal memory access
ALLOCA_N takes type arugment. It is natural that the returned
value to be used as an array of type, thus type-aligned.
Luckily GCC has a builtin to tell compiler such alignment info.
This should generate beter instructions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61830 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'include/ruby/ruby.h')
| -rw-r--r-- | include/ruby/ruby.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h index fe0ecf4622..19489bb18c 100644 --- a/include/ruby/ruby.h +++ b/include/ruby/ruby.h @@ -1595,7 +1595,15 @@ rb_num2char_inline(VALUE x) #define ZALLOC(type) RB_ZALLOC(type) #define REALLOC_N(var,type,n) RB_REALLOC_N(var,type,n) +#ifdef HAVE_BUILTIN___BUILTIN_ALLOCA_WITH_ALIGN +/* I don't know why but __builtin_alloca_with_align's second argument + takes bits rather than bytes. */ +#define ALLOCA_N(type, n) \ + (type*)__builtin_alloca_with_align((sizeof(type)*(n)), \ + sizeof(type) * CHAR_BIT) +#else #define ALLOCA_N(type,n) ((type*)alloca(sizeof(type)*(n))) +#endif void *rb_alloc_tmp_buffer(volatile VALUE *store, long len) RUBY_ATTR_ALLOC_SIZE((2)); void *rb_alloc_tmp_buffer_with_count(volatile VALUE *store, size_t len,size_t count) RUBY_ATTR_ALLOC_SIZE((2,3)); |