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Simplify a memcpy() in defragmentPage(). It now might copy more content than

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is strictly necessary, but runs faster and uses less code space.  Possible
reasons for the improved performance:
(1) the copy is now always 8-byte aligned,
(2) fewer intermediate results are required which means less register
pressure which helps the compiler to optimize the subroutine.

FossilOrigin-Name: 6e5607ae4d872954483a8d7a5c866aa41e4af70fae9652fb7eb211b316ab724d
This commit is contained in:
drh
2023-06-09 15:54:18 +00:00
parent 6e4ff8707e
commit 7520116441
3 changed files with 9 additions and 9 deletions
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src/btree.c
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@@ -1635,7 +1635,7 @@ static int defragmentPage(MemPage *pPage, int nMaxFrag){
iCellStart = get2byte(&data[hdr+5]);
if( nCell>0 ){
temp = sqlite3PagerTempSpace(pPage->pBt->pPager);
memcpy(&temp[iCellStart], &data[iCellStart], usableSize - iCellStart);
memcpy(temp, data, usableSize);
src = temp;
for(i=0; i<nCell; i++){
u8 *pAddr; /* The i-th cell pointer */