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vim-patch:8.0.0504: looking up an Ex command is a bit slow

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Problem:    Looking up an Ex command is a bit slow.
Solution:   Instead of just using the first letter, also use the second letter
            to skip ahead in the list of commands. Generate the table with a
            Perl script. (Dominique Pelle, closes vim/vim#1589)
e5e0fbcd42
This commit is contained in:
Jan Edmund Lazo 2019-03-10 17:27:29 -04:00
parent 2470c88291
commit c3158e230d
1 changed files with 19 additions and 4 deletions
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23
src/nvim/ex_docmd.c
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@ -155,6 +155,8 @@ struct dbg_stuff {
# include "ex_cmds_defs.generated.h"
#endif
static const int command_count = 539;
static char_u dollar_command[2] = {'$', 0};
static void save_dbg_stuff(struct dbg_stuff *dsp)
@ -2440,10 +2442,23 @@ static char_u *find_command(exarg_T *eap, int *full)
}
}
if (ASCII_ISLOWER(*eap->cmd))
eap->cmdidx = cmdidxs[CharOrdLow(*eap->cmd)];
else
eap->cmdidx = cmdidxs[26];
if (ASCII_ISLOWER(eap->cmd[0])) {
if (command_count != (int)CMD_SIZE) {
iemsg((char_u *)_("E943: Command table needs to be updated, run 'make cmdidxs'"));
getout(1);
}
// Use a precomputed index for fast look-up in cmdnames[]
// taking into account the first 2 letters of eap->cmd.
const int c1 = eap->cmd[0];
const int c2 = eap->cmd[1];
eap->cmdidx = cmdidxs1[CharOrdLow(c1)];
if (ASCII_ISLOWER(c2)) {
eap->cmdidx += cmdidxs2[CharOrdLow(c1)][CharOrdLow(c2)];
}
} else {
eap->cmdidx = CMD_bang;
}
for (; (int)eap->cmdidx < (int)CMD_SIZE;
eap->cmdidx = (cmdidx_T)((int)eap->cmdidx + 1))