Hi,
after getting fed up with the slow speed of freeciv in a large game I
did some profiling. One thing I noticed is that there are MACROS that
use one of their arguments twice. With the change to make the
player_index a function call they are not called with a function
call as argument instead of an interger. Using the argument twice
means the function call is executed twice.
In the server 3% of the total time where spend in map_is_known:
[56] 3.0 5.43 12.74 152585010 map_is_known [56]
8.89 0.00 305170020/565345748 player_number [62]
3.85 0.00 305170020/541877534 player_index [103]
Notice how player_number and player_index is called twice for every
map_is_known?
---[ server/maphand.c ]------------------------------------------------------
/****************************************************************************
Return whether the player knows the tile. Knowing a tile means
you've
seen it once (as opposed to seeing a tile which means you can see it
now).
****************************************************************************/
bool map_is_known(const struct tile *ptile, const struct player
*pplayer)
{
return BV_ISSET(ptile->tile_known, player_index(pplayer));
}
---[ utils/shared.h ]------------------------------------------------------
#define BV_ISSET(bv, bit) \
(_BV_ASSERT(bv, bit), \
((bv).vec[_BV_BYTE_INDEX(bit)] & _BV_BITMASK(bit)) != 0)
---[ common/player.c ]-----------------------------------------------------
/**************************************************************************
Return the player index.
Currently same as player_number(), paired with player_count()
indicates use as an array index.
**************************************************************************/
int player_index(const struct player *pplayer)
{
return player_number(pplayer);
}
/**************************************************************************
Return the player index/number/id.
**************************************************************************/
int player_number(const struct player *pplayer)
{
assert(pplayer);
return pplayer - game.players;
}
-----------------------------------------------------------------------------
Is there any reason BV_ISSET (and similar ones) isn't written as a
static inline function? That one macro alone would save 1.5%.
Inlining the player_number() and player_index() functions (and other
similary trivial and often called functions) would save a lot of time
too. Any reason such frequent one-liners aren't declared static inline
in the header file?
MfG
Goswin
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