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Branchless sectorofwall_internal()

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git-svn-id: https://svn.eduke32.com/eduke32@6794 1a8010ca-5511-0410-912e-c29ae57300e0
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terminx 2018-04-02 22:00:23 +00:00
parent aba97eb6a9
commit f3843a9a3a
2 changed files with 16 additions and 17 deletions
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4
source/build/include/build.h
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@ -1223,8 +1223,8 @@ int clipshape_idx_for_sprite(uspritetype const * const curspr, int curidx);
void alignceilslope(int16_t dasect, int32_t x, int32_t y, int32_t z); void alignceilslope(int16_t dasect, int32_t x, int32_t y, int32_t z);
void alignflorslope(int16_t dasect, int32_t x, int32_t y, int32_t z); void alignflorslope(int16_t dasect, int32_t x, int32_t y, int32_t z);
int32_t sectorofwall(int16_t theline); int32_t sectorofwall(int16_t wallNum);
int32_t sectorofwall_noquick(int16_t theline); int32_t sectorofwall_noquick(int16_t wallNum);
int32_t loopnumofsector(int16_t sectnum, int16_t wallnum); int32_t loopnumofsector(int16_t sectnum, int16_t wallnum);
void setslope(int32_t sectnum, int32_t cf, int16_t slope); void setslope(int32_t sectnum, int32_t cf, int16_t slope);

29
source/build/src/engine.cpp
View file

@ -12473,39 +12473,38 @@ void completemirror(void)
// //
// sectorofwall // sectorofwall
// //
static int32_t sectorofwall_internal(int16_t theline) static int32_t sectorofwall_internal(int16_t wallNum)
{ {
int32_t gap = numsectors>>1, i = gap; native_t gap = numsectors>>1, sectNum = gap;
while (gap > 1) while (gap > 1)
{ {
gap >>= 1; gap >>= 1;
if (sector[i].wallptr < theline) i += gap; else i -= gap; native_t const n = !!(sector[sectNum].wallptr < wallNum);
sectNum += (n ^ (n - 1)) * gap;
} }
while (sector[i].wallptr > theline) i--; while (sector[sectNum].wallptr > wallNum) sectNum--;
while (sector[i].wallptr+sector[i].wallnum <= theline) i++; while (sector[sectNum].wallptr + sector[sectNum].wallnum <= wallNum) sectNum++;
return i; return sectNum;
} }
int32_t sectorofwall(int16_t theline) int32_t sectorofwall(int16_t wallNum)
{ {
if ((unsigned)theline >= (unsigned)numwalls) if (EDUKE32_PREDICT_FALSE((unsigned)wallNum >= (unsigned)numwalls))
return -1; return -1;
int i = wall[theline].nextwall; native_t const w = wall[wallNum].nextwall;
if ((unsigned)i < MAXWALLS)
return wall[i].nextsector;
return sectorofwall_internal(theline); return ((unsigned)w < MAXWALLS) ? wall[w].nextsector : sectorofwall_internal(wallNum);
} }
int32_t sectorofwall_noquick(int16_t theline) int32_t sectorofwall_noquick(int16_t wallNum)
{ {
if ((unsigned)theline >= (unsigned)numwalls) if (EDUKE32_PREDICT_FALSE((unsigned) wallNum >= (unsigned) numwalls))
return -1; return -1;
return sectorofwall_internal(theline); return sectorofwall_internal(wallNum);
} }