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38973: Optimize indexing array parameters.

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% () { for 1 in $prefix/zsh/bin/zsh Src/zsh; do $1 -f -c 'a=( {1..1000000} ); repeat 3 time ( repeat 300 : $a[1]  )'; done }
( repeat 300; do; : $a[1]; done; )  1.68s user 0.01s system 98% cpu 1.718 total
( repeat 300; do; : $a[1]; done; )  1.69s user 0.01s system 99% cpu 1.710 total
( repeat 300; do; : $a[1]; done; )  1.69s user 0.01s system 99% cpu 1.714 total

( repeat 300; do; : $a[1]; done; )  0.00s user 0.01s system 72% cpu 0.022 total
( repeat 300; do; : $a[1]; done; )  0.00s user 0.01s system 72% cpu 0.022 total
( repeat 300; do; : $a[1]; done; )  0.01s user 0.01s system 69% cpu 0.023 total
This commit is contained in:
Daniel Shahaf 2016-07-30 10:14:35 +00:00
parent faa163cd5f
commit 1a368bf31f
4 changed files with 55 additions and 5 deletions
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40
Src/utils.c
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@ -2280,6 +2280,46 @@ arrlen(char **s)
return count;
}
/* Return TRUE iff arrlen(s) >= lower_bound, but more efficiently. */
/**/
mod_export char
arrlen_ge(char **s, unsigned lower_bound)
{
while (lower_bound--)
if (!*s++)
return 0 /* FALSE */;
return 1 /* TRUE */;
}
/* Return TRUE iff arrlen(s) > lower_bound, but more efficiently. */
/**/
mod_export char
arrlen_gt(char **s, unsigned lower_bound)
{
return arrlen_ge(s, 1+lower_bound);
}
/* Return TRUE iff arrlen(s) <= upper_bound, but more efficiently. */
/**/
mod_export char
arrlen_le(char **s, unsigned upper_bound)
{
return arrlen_lt(s, 1+upper_bound);
}
/* Return TRUE iff arrlen(s) < upper_bound, but more efficiently. */
/**/
mod_export char
arrlen_lt(char **s, unsigned upper_bound)
{
return !arrlen_ge(s, upper_bound);
}
/* Skip over a balanced pair of parenthesis. */
/**/