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rb_enc_str_asciionly_p: avoid always fetching the encoding

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Profiling of `JSON.dump` shows a significant amount of time spent
in `rb_enc_str_asciionly_p`, in large part because it fetches the
encoding.

It can be made twice as fast in this scenario by first checking the
coderange and only falling back to fetching the encoding if the
coderange is unknown.

Additionally we can skip fetching the encoding for the common
popular encodings.
This commit is contained in:
Jean Boussier 2024-09-03 09:38:18 +02:00
parent 245ed2fc89
commit b7fa2dd0d0
Notes: git 2024-09-03 10:21:55 +00:00 
Merged: https://github.com/ruby/ruby/pull/11533
1 changed files with 23 additions and 9 deletions
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32
string.c
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@ -137,10 +137,10 @@ VALUE rb_cSymbol;
} while (0)
static inline bool
str_enc_fastpath(VALUE str)
str_encindex_fastpath(int encindex)
{
// The overwhelming majority of strings are in one of these 3 encodings.
switch (ENCODING_GET_INLINED(str)) {
switch (encindex) {
case ENCINDEX_ASCII_8BIT:
case ENCINDEX_UTF_8:
case ENCINDEX_US_ASCII:
@ -150,6 +150,12 @@ str_enc_fastpath(VALUE str)
}
}
static inline bool
str_enc_fastpath(VALUE str)
{
return str_encindex_fastpath(ENCODING_GET_INLINED(str));
}
#define TERM_LEN(str) (str_enc_fastpath(str) ? 1 : rb_enc_mbminlen(rb_enc_from_index(ENCODING_GET(str))))
#define TERM_FILL(ptr, termlen) do {\
char *const term_fill_ptr = (ptr);\
@ -862,16 +868,24 @@ rb_enc_str_coderange(VALUE str)
return cr;
}
static inline bool
rb_enc_str_asciicompat(VALUE str)
{
int encindex = ENCODING_GET_INLINED(str);
return str_encindex_fastpath(encindex) || rb_enc_asciicompat(rb_enc_get_from_index(encindex));
}
int
rb_enc_str_asciionly_p(VALUE str)
{
rb_encoding *enc = STR_ENC_GET(str);
if (!rb_enc_asciicompat(enc))
return FALSE;
else if (is_ascii_string(str))
return TRUE;
return FALSE;
switch(ENC_CODERANGE(str)) {
case ENC_CODERANGE_UNKNOWN:
return rb_enc_str_asciicompat(str) && is_ascii_string(str);
case ENC_CODERANGE_7BIT:
return true;
default:
return false;
}
}
static inline void