[Freeciv-Dev] [PATCH] Change shifts and rotates to multiplications and d
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This patch changes various shifts and rotates to divides and
multiplications. I think we should rely on compiler to optimize
these right. Main point is to avoid code obfuscation. I hope I
caught all divisions and multiplications. I also hope I left
alone all bitwise operations, as it is normal to use shifts and
rotates there.
------------------------------------------------------------------------
General ChangeLog
Change <<1 to *2, >>1 to /2 etc. to increase readability of the
code.
------------------------------------------------------------------------
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/ai/advdomestic.c freeciv-shift/ai/advdomestic.c
--- freeciv-cvs/ai/advdomestic.c Sat Jun 12 15:03:19 1999
+++ freeciv-shift/ai/advdomestic.c Sat Jul 3 01:41:10 1999
@@ -103,7 +103,7 @@
if (is_worker_here(pcity, x, y)) i++;
}
}
- return(i>>1);
+ return(i/2);
}
int railroad_trade(struct city *pcity)
@@ -163,16 +163,16 @@
}
p -= 20;
if (p < 0) p = 0;
- b = (POLLUTION_WEIGHTING + pplayer->ai.warmth)<<6;
+ b = (POLLUTION_WEIGHTING + pplayer->ai.warmth)*64;
if (pcity->pollution > 0) {
a = amortize(b, 100 / pcity->pollution);
- c = ((a * b) / (MAX(1, b - a)))>>6;
+ c = ((a * b) / (MAX(1, b - a)))/64;
freelog(LOG_DEBUG, "City: %s, Pollu: %d, cost: %d, Id: %d, P: %d",
pcity->name, pcity->pollution, c, id, p);
} else c = 0;
if (p) {
a = amortize(b, 100 / p);
- c -= ((a * b) / (MAX(1, b - a)))>>6;
+ c -= ((a * b) / (MAX(1, b - a)))/64;
}
return(c); /* benefit or cost of this building */
}
@@ -195,8 +195,8 @@
tax *= t;
#else
/* better might be a longterm weighted average, this is a quick-n-dirty fix --
Syela */
- sci = ((sci + pcity->trade_prod) * t)>>1;
- tax = ((tax + pcity->trade_prod) * t)>>1;
+ sci = ((sci + pcity->trade_prod) * t)/2;
+ tax = ((tax + pcity->trade_prod) * t)/2;
#endif
if (pplayer->research.researching == A_NONE) sci = 0; /* don't need
libraries!! */
prod = pcity->shield_prod * 100 / city_shield_bonus(pcity) *
SHIELD_WEIGHTING;
@@ -223,7 +223,7 @@
int asz = game.aqueduct_size;
if (city_happy(pcity) && pcity->size > asz-1 && est_food > 0)
values[B_AQUEDUCT] = ((((city_got_effect(pcity, B_GRANARY) ? 3 : 2) *
- pcity->size * game.foodbox)>>1) - pcity->food_stock) * food;
+ pcity->size * game.foodbox)/2) - pcity->food_stock) * food;
else values[B_AQUEDUCT] = food * est_food * asz * game.foodbox /
MAX(1, ((asz+1 - MIN(asz, pcity->size)) * MAX(asz, pcity->size) *
game.foodbox - pcity->food_stock));
@@ -295,12 +295,12 @@
values[B_COLOSSEUM] = building_value(4, pcity, val) - building_value(3,
pcity, val);
if (could_build_improvement(pcity, B_COURTHOUSE)) {
- values[B_COURTHOUSE] = (pcity->corruption * t)>>1;
+ values[B_COURTHOUSE] = (pcity->corruption * t)/2;
if (gov == G_DEMOCRACY) values[B_COLOSSEUM] += building_value(1, pcity,
val);
}
if (could_build_improvement(pcity, B_FACTORY))
- values[B_FACTORY] = (prod>>1) + pollution_cost(pplayer, pcity, B_FACTORY);
+ values[B_FACTORY] = (prod/2) + pollution_cost(pplayer, pcity, B_FACTORY);
if (could_build_improvement(pcity, B_GRANARY) &&
!(improvement_variant(B_PYRAMIDS)==0 &&
@@ -311,10 +311,10 @@
values[B_HARBOUR] = food * ocean_workers(pcity) * hunger;
if (could_build_improvement(pcity, B_HYDRO) && !built_elsewhere(pcity,
B_HOOVER))
- values[B_HYDRO] = ((needpower * prod)>>2) + pollution_cost(pplayer, pcity,
B_HYDRO);
+ values[B_HYDRO] = ((needpower * prod)/4) + pollution_cost(pplayer, pcity,
B_HYDRO);
if (could_build_improvement(pcity, B_LIBRARY))
- values[B_LIBRARY] = sci>>1;
+ values[B_LIBRARY] = sci/2;
if (could_build_improvement(pcity, B_MARKETPLACE))
values[B_MARKETPLACE] = (tax + 3*pcity->ppl_taxman +
@@ -325,20 +325,20 @@
city_got_building(pcity, B_NUCLEAR) ||
city_got_building(pcity, B_POWER) ||
city_affected_by_wonder(pcity, B_HOOVER)) ?
- (prod * 3)>>2 : prod>>1) +
+ (prod * 3)/4 : prod/2) +
pollution_cost(pplayer, pcity, B_MFG);
if (could_build_improvement(pcity, B_NUCLEAR))
- values[B_NUCLEAR] = ((needpower * prod)>>2) + pollution_cost(pplayer,
pcity, B_NUCLEAR);
+ values[B_NUCLEAR] = ((needpower * prod)/4) + pollution_cost(pplayer,
pcity, B_NUCLEAR);
if (could_build_improvement(pcity, B_OFFSHORE)) /* ignoring pollu. FIX? */
values[B_OFFSHORE] = ocean_workers(pcity) * SHIELD_WEIGHTING;
if (could_build_improvement(pcity, B_POWER))
- values[B_POWER] = ((needpower * prod)>>2) + pollution_cost(pplayer, pcity,
B_POWER);
+ values[B_POWER] = ((needpower * prod)/4) + pollution_cost(pplayer, pcity,
B_POWER);
if (could_build_improvement(pcity, B_RESEARCH) && !built_elsewhere(pcity,
B_SETI))
- values[B_RESEARCH] = sci>>1;
+ values[B_RESEARCH] = sci/2;
if (could_build_improvement(pcity, B_SDI))
values[B_SDI] = 50; /* WAG */
@@ -347,7 +347,7 @@
int ssz = game.sewer_size;
if (city_happy(pcity) && pcity->size > ssz-1 && est_food > 0)
values[B_SEWER] = ((((city_got_effect(pcity, B_GRANARY) ? 3 : 2) *
- pcity->size * game.foodbox)>>1) - pcity->food_stock) * food;
+ pcity->size * game.foodbox)/2) - pcity->food_stock) * food;
else values[B_SEWER] = food * est_food * ssz * game.foodbox /
MAX(1, ((ssz+1 - MIN(ssz, pcity->size)) * MAX(ssz, pcity->size) *
game.foodbox - pcity->food_stock));
@@ -366,7 +366,7 @@
values[B_TEMPLE] = building_value(get_temple_power(pcity), pcity, val);
if (could_build_improvement(pcity, B_UNIVERSITY))
- values[B_UNIVERSITY] = sci>>1;
+ values[B_UNIVERSITY] = sci/2;
if (could_build_improvement(pcity, B_MASS))
values[B_MASS] = pollution_cost(pplayer, pcity, B_MASS);
@@ -386,7 +386,7 @@
if (i == B_COLLOSSUS)
values[i] = (pcity->size + 1) * t; /* probably underestimates the
value */
if (i == B_COPERNICUS)
- values[i] = sci>>1;
+ values[i] = sci/2;
if (i == B_CURE)
values[i] = building_value(1, pcity, val);
if (i == B_DARWIN) /* this is a one-time boost, not constant */
@@ -408,7 +408,7 @@
if (i == B_HOOVER && !city_got_building(pcity, B_HYDRO) &&
!city_got_building(pcity, B_NUCLEAR))
values[i] = (city_got_building(pcity, B_POWER) ? 0 :
- (needpower * prod)>>2) + pollution_cost(pplayer, pcity,
B_HOOVER);
+ (needpower * prod)/4) + pollution_cost(pplayer, pcity,
B_HOOVER);
if (i == B_ISAAC)
values[i] = sci;
if (i == B_LEONARDO) {
@@ -445,7 +445,7 @@
&& !city_got_building(pcity, B_GRANARY))
values[i] = food * pcity->food_surplus; /* different tech req's */
if (i == B_SETI && !city_got_building(pcity, B_RESEARCH))
- values[i] = sci>>1;
+ values[i] = sci/2;
if (i == B_SHAKESPEARE)
values[i] = building_value(pcity->size, pcity, val);
if (i == B_SUNTZU)
@@ -543,7 +543,7 @@
if (want > choice->want) {
choice->want = want;
choice->type = 1;
- ai_choose_role_unit(pplayer, pcity, choice, F_CARAVAN, i>>1);
+ ai_choose_role_unit(pplayer, pcity, choice, F_CARAVAN, i/2);
}
} else
pplayer->ai.tech_want[get_unit_type(iunit)->tech_requirement] += want;
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/ai/advmilitary.c freeciv-shift/ai/advmilitary.c
--- freeciv-cvs/ai/advmilitary.c Sat Jun 12 15:03:19 1999
+++ freeciv-shift/ai/advmilitary.c Sat Jul 3 01:44:32 1999
@@ -134,7 +134,7 @@
denom += (denom + m * 2) / (m * 4);
dist--;
}
- v = (v*num + (denom>>1)) / denom;
+ v = (v*num + (denom/2)) / denom;
return(v);
#endif
}
@@ -147,8 +147,8 @@
if (is_sailing_unit(punit) && !is_terrain_near_tile(pcity->x, pcity->y,
T_OCEAN)) v = 0;
/* get_attack_power will be wrong if moves_left == 1 || == 2 */
v *= punit->hp * get_unit_type(punit->type)->firepower;
- if (city_got_building(pcity, B_COASTAL) && is_sailing_unit(punit)) v >>= 1;
- if (city_got_building(pcity, B_SAM) && is_air_unit(punit)) v >>= 1;
+ if (city_got_building(pcity, B_COASTAL) && is_sailing_unit(punit)) v /= 2;
+ if (city_got_building(pcity, B_SAM) && is_air_unit(punit)) v /= 2;
v /= 30; /* rescaling factor to stop the overflow nonsense */
return(v);
}
@@ -256,9 +256,9 @@
}
if (unit_flag(funit->type, F_HORSE)) {
- if (pikemen) v >>= 1;
+ if (pikemen) v /= 2;
else ai_wants_role_unit(pplayer, pcity, F_PIKEMEN,
- (v * m / (dist<<1)));
+ (v * m / (dist*2)));
}
if (unit_flag(funit->type, F_DIPLOMAT) && (dist <= 2 * m))
@@ -298,9 +298,9 @@
}
if (unit_flag(punit->type, F_HORSE)) {
- if (pikemen) v >>= 1;
+ if (pikemen) v /= 2;
else ai_wants_role_unit(pplayer, pcity, F_PIKEMEN,
- (v * m / (dist<<1)));
+ (v * m / (dist*2)));
}
if (unit_flag(punit->type, F_DIPLOMAT) && (dist <= 2 * m))
@@ -400,7 +400,7 @@
d = get_unit_type(i)->defense_strength;
if (def) cur *= d;
else if (d > a) return(0);
-/* else if (d < 2) cur = (cur * (a + d))>>1; Don't believe in this anymore */
+/* else if (d < 2) cur = (cur * (a + d))/2; Don't believe in this anymore */
else cur *= a; /* wanted to rank Legion > Catapult > Archer */
/* which we will do by munging f in the attacker want equations */
if (unit_flag(i, F_IGTER) && !def) cur *= 3;
@@ -495,8 +495,8 @@
unit_types[i].attack_strength && /* otherwise we get SIGFPE's */
m == movetype) { /* I don't think I want the duplication otherwise --
Syela */
l = k * (k + pplayer->research.researchpoints) * game.techlevel;
- if (game.year > 0) l >>= 1;
- else l >>= 2; /* cost (shield equiv) of gaining these techs */
+ if (game.year > 0) l /= 2;
+ else l /= 4; /* cost (shield equiv) of gaining these techs */
l /= city_list_size(&pplayer->cities);
/* Katvrr advises that with danger high, l should be weighted more heavily */
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/ai/aicity.c freeciv-shift/ai/aicity.c
--- freeciv-cvs/ai/aicity.c Sat Jun 12 15:03:20 1999
+++ freeciv-shift/ai/aicity.c Sat Jul 3 01:33:37 1999
@@ -316,7 +316,7 @@
&& is_on_unit_upgrade_path(bestchoice.choice, punit->type)))
&& ai_fuzzy(pplayer, 1)) {
if (!did_upgrade) { /* might want to disband */
- build = pcity->shield_stock +
(get_unit_type(punit->type)->build_cost>>1);
+ build = pcity->shield_stock +
(get_unit_type(punit->type)->build_cost/2);
total = get_unit_type(bestchoice.choice)->build_cost;
cost=(total-build)*2+(total-build)*(total-build)/20;
if ((bestchoice.want <= 100 && build >= total) ||
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/ai/aihand.c freeciv-shift/ai/aihand.c
--- freeciv-cvs/ai/aihand.c Sat Jun 12 15:03:20 1999
+++ freeciv-shift/ai/aihand.c Sat Jul 3 01:38:25 1999
@@ -272,10 +272,10 @@
ai_fuzzy(pplayer,1)) {
freelog(LOG_DEBUG, "%d happy people in %s",
pcity->ppl_happy[4], pcity->name);
- n = ((pcity->size>>1) - pcity->ppl_happy[4]) * 20;
+ n = ((pcity->size/2) - pcity->ppl_happy[4]) * 20;
if (n > pcity->ppl_content[1] * 20) n += (n - pcity->ppl_content[1] *
20);
m = ((((city_got_effect(pcity, B_GRANARY) ? 3 : 2) *
- (pcity->size+1) * game.foodbox)>>1) -
+ (pcity->size+1) * game.foodbox)/2) -
pcity->food_stock) * food_weighting(pcity->size);
freelog(LOG_DEBUG, "Checking HHJJ for %s, m = %d", pcity->name, m);
tot = 0;
@@ -283,7 +283,7 @@
if (pcity->trade_prod * i * city_tax_bonus(pcity) >= n * 100) {
if (!tot) freelog(LOG_DEBUG, "%s celebrates at %d.",
pcity->name, i * 10);
- hhjj[i] += (pcity->was_happy ? m : m>>1);
+ hhjj[i] += (pcity->was_happy ? m : m/2);
tot++;
}
}
@@ -358,7 +358,7 @@
} else { /* have to balance things logically */
/* if we need 50 gold and we have trade = 100, need 50 % tax (n = 5) */
/* n = ((ai_gold_reserve(pplayer) - gnow - expense) ... I hate typos. --
Syela */
- n = ((ai_gold_reserve(pplayer) - gnow + expense + cities) * 20 +
(trade<<1) - 1) / (trade<<1);
+ n = ((ai_gold_reserve(pplayer) - gnow + expense + cities) * 20 + (trade*2)
- 1) / (trade*2);
/* same bug here as above, caused us not to afford city walls we needed. --
Syela */
if (n < 0) n = 0; /* shouldn't allow 0 tax? */
while (n > 10 - (pplayer->economic.luxury / 10) || n > maxrate) n--;
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/ai/aiunit.c freeciv-shift/ai/aiunit.c
--- freeciv-cvs/ai/aiunit.c Thu Jun 24 14:55:19 1999
+++ freeciv-shift/ai/aiunit.c Sat Jul 3 01:38:10 1999
@@ -1270,7 +1270,7 @@
if (punit->activity != ACTIVITY_IDLE)
return;
if (punit->ai.ai_role == AIUNIT_NONE) {
- if ((pcity = wonder_on_continent(pplayer, map_get_continent(punit->x,
punit->y))) && build_points_left(pcity) > (pcity->shield_surplus<<1)) {
+ if ((pcity = wonder_on_continent(pplayer, map_get_continent(punit->x,
punit->y))) && build_points_left(pcity) > (pcity->shield_surplus*2)) {
if (!same_pos(pcity->x, pcity->y, punit->x, punit->y)) {
if (!punit->moves_left) return;
auto_settler_do_goto(pplayer,punit, pcity->x, pcity->y);
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/server/gotohand.c freeciv-shift/server/gotohand.c
--- freeciv-cvs/server/gotohand.c Sat Jun 12 15:03:30 1999
+++ freeciv-shift/server/gotohand.c Sat Jul 3 01:45:05 1999
@@ -106,7 +106,7 @@
if (punit && unit_flag(punit->type, F_IGTER)) igter++;
if (punit && unit_flag(punit->type, F_SETTLERS)
- && get_unit_type(punit->type)->move_rate==3) maxcost >>= 1;
+ && get_unit_type(punit->type)->move_rate==3) maxcost /= 2;
/* (?) was punit->type == U_SETTLERS -- dwp */
do {
@@ -129,7 +129,7 @@
This led to a bad bug where a unit in a swamp was considered too far away */
else {
tm = map_get_tile(x1, y1)->move_cost[7-k];
- c = (tile0->move_cost[k] + tm + (tile0->move_cost[k] > tm ? 1 :
0))>>1;
+ c = (tile0->move_cost[k] + tm + (tile0->move_cost[k] > tm ? 1 :
0))/2;
}
tm = warmap.cost[x][y] + c;
@@ -197,9 +197,9 @@
if (y1 > y0) s = y1 - y0;
else n = y0 - y1;
dx = x1 - x0;
- if (dx > map.xsize>>1) w = map.xsize - dx;
+ if (dx > map.xsize/2) w = map.xsize - dx;
else if (dx > 0) e = dx;
- else if (dx + (map.xsize>>1) > 0) w = 0 - dx;
+ else if (dx + (map.xsize/2) > 0) w = 0 - dx;
else e = map.xsize + dx;
if (e == map.xsize / 2 || w == map.xsize / 2) { /* thanks, Massimo */
if (k < 3 && s >= MAX(e, w)) return 0;
@@ -616,7 +616,7 @@
adjtile = map_get_tile(x + ii[n], y + jj[n]);
if (adjtile->terrain != T_OCEAN) nearland++;
if (!((adjtile->known)&(1u<<punit->owner))) {
- if (punit->moves_left <= c) d[k] -= (d[k]>>4); /* Avoid the unknown
*/
+ if (punit->moves_left <= c) d[k] -= (d[k]/16); /* Avoid the unknown
*/
else d[k]++; /* nice but not important */
} else { /* NOTE: Not being omniscient here!! -- Syela */
unit_list_iterate(adjtile->units, aunit) /* lookin for trouble */
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/server/settlers.c freeciv-shift/server/settlers.c
--- freeciv-cvs/server/settlers.c Thu Jun 24 14:55:21 1999
+++ freeciv-shift/server/settlers.c Sat Jul 3 01:42:28 1999
@@ -98,7 +98,7 @@
d--;
}
if (denom > 1) {
- b = (b + (denom>>1)) / denom;
+ b = (b + (denom/2)) / denom;
}
}
return(b * s);
@@ -818,11 +818,11 @@
newv = pcity->ai.irrigate[i][j];
if (newv >= oldv) { /* worth evaluating */
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (map_build_irrigation_time(x, y) * 3 + mv_rate - 1) / mv_rate
+ mv_turns;
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if ((newv > best_newv || (newv == best_newv && oldv > best_oldv))
&& ai_fuzzy(pplayer, 1)) {
@@ -835,11 +835,11 @@
newv = pcity->ai.mine[i][j];
if (newv >= oldv) {
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (map_build_mine_time(x, y) * 3 + mv_rate - 1) / mv_rate
+ mv_turns;
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if ((newv > best_newv || (newv == best_newv && oldv > best_oldv))
&& ai_fuzzy(pplayer, 1)) {
@@ -856,11 +856,11 @@
newv = MAX(newv, oldv) + road_bonus(x, y, S_ROAD) * 8;
/* guessing about the weighting based on unit upkeeps;
(* 11) was too high! -- Syela */
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (map_build_road_time(x, y) * 3 + 3 + mv_rate - 1) / mv_rate
+ mv_turns; /* uniquely weird! */
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if ((newv > best_newv || (newv == best_newv && oldv > best_oldv))
&& ai_fuzzy(pplayer, 1)) {
@@ -874,11 +874,11 @@
newv = pcity->ai.railroad[i][j];
if (newv >= 0) {
newv = MAX(newv, oldv) + road_bonus(x, y, S_RAILROAD) * 4;
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (3 * 3 + 3 * map_build_road_time(x,y) + 3 + mv_rate - 1)
/ mv_rate + mv_turns;
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if ((newv > best_newv || (newv == best_newv && oldv > best_oldv))
&& ai_fuzzy(pplayer, 1)) {
@@ -889,10 +889,10 @@
newv = pcity->ai.railroad[i][j];
if (newv >= 0) {
newv = MAX(newv, oldv) + road_bonus(x, y, S_RAILROAD) * 4;
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (3 * 3 + mv_rate - 1) / mv_rate + mv_turns;
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if ((newv > best_newv || (newv == best_newv && oldv > best_oldv))
&& ai_fuzzy(pplayer, 1)) {
@@ -904,10 +904,10 @@
newv = pcity->ai.detox[i][j];
if (newv >= 0) {
newv = MAX(newv, oldv) + pplayer->ai.warmth;
- b = MAX((newv - oldv)<<6, MORT);
+ b = MAX((newv - oldv)*64, MORT);
d = (3 * 3 + mv_turns + mv_rate - 1) / mv_rate + mv_turns;
a = amortize(b, d);
- newv = ((a * b) / (MAX(1, b - a)))>>6;
+ newv = ((a * b) / (MAX(1, b - a)))/64;
} else newv = 0;
if (newv > best_newv || (newv == best_newv && oldv > best_oldv)) {
best_act = ACTIVITY_POLLUTION;
diff -u --recursive --new-file --exclude-from=.diffignore
freeciv-cvs/server/unitfunc.c freeciv-shift/server/unitfunc.c
--- freeciv-cvs/server/unitfunc.c Sat Jun 12 15:03:33 1999
+++ freeciv-shift/server/unitfunc.c Sat Jul 3 01:35:40 1999
@@ -116,7 +116,7 @@
void spy_sabotage_unit(struct player *pplayer, struct unit *pdiplomat, struct
unit *pvictim){
if(pvictim && pvictim->hp > 1){
- pvictim->hp = pvictim->hp >> 1;
+ pvictim->hp /= 2;
notify_player_ex(get_player(pvictim->owner),
pvictim->x, pvictim->y, E_DIPLOMATED,
"Your %s was sabotaged by %s!",
--
//Markus
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