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ICU-6453 merge _findRow() optimizations

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X-SVN-Rev: 25025
This commit is contained in:
Markus Scherer 2008-12-01 22:41:06 +00:00
parent 4caa716b9a
commit 71dea647bd
1 changed files with 29 additions and 39 deletions
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52
icu4c/source/common/propsvec.c
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@ -97,22 +97,34 @@ _findRow(UPropsVectors *pv, UChar32 rangeStart) {
rows=limit=pv->rows;
prevRow=pv->prevRow;
/* check the vicinity of the last-seen row */
if(prevRow<rows) {
/* check the vicinity of the last-seen row (start searching with an unrolled loop) */
row=pv->v+prevRow*columns;
if(rangeStart>=(UChar32)row[0]) {
if(rangeStart<(UChar32)row[1]) {
/* same row as last seen */
return row;
} else if(
++prevRow<rows &&
rangeStart>=(UChar32)(row+=columns)[0] && rangeStart<(UChar32)row[1]
) {
} else if(rangeStart<(UChar32)(row+=columns)[1]) {
/* next row after the last one */
pv->prevRow=prevRow+1;
return row;
} else if(rangeStart<(UChar32)(row+=columns)[1]) {
/* second row after the last one */
pv->prevRow=prevRow+2;
return row;
} else if((rangeStart-(UChar32)row[1])<10) {
/* we are close, continue looping */
prevRow+=2;
do {
++prevRow;
row+=columns;
} while(rangeStart>=(UChar32)row[1]);
pv->prevRow=prevRow;
return row;
}
}
} else if(rangeStart<(UChar32)pv->v[1]) {
/* the very first row */
pv->prevRow=0;
return pv->v;
}
/* do a binary search for the start of the range */
@ -170,31 +182,9 @@ upvec_setValue(UPropsVectors *pv,
/* find the rows whose ranges overlap with the input range */
/* find the first row, always successful */
/* find the first and last rows, always successful */
firstRow=_findRow(pv, start);
/* find the last row, always successful */
lastRow=firstRow;
/*
* Start searching with an unrolled loop:
* start and limit are often in a single range, or in adjacent ranges.
*/
if(limit>(UChar32)lastRow[1]) {
lastRow+=columns;
if(limit>(UChar32)lastRow[1]) {
lastRow+=columns;
if(limit>(UChar32)lastRow[1]) {
if((limit-(UChar32)lastRow[1])<10) {
/* we are close, continue looping */
do {
lastRow+=columns;
} while(limit>(UChar32)lastRow[1]);
} else {
lastRow=_findRow(pv, limit-1);
}
}
}
}
lastRow=_findRow(pv, end);
/*
* Rows need to be split if they partially overlap with the