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Simplifications to the overflow-free multiplier. Also remove some commented-out

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code that was left in that subroutine by mistake on the previous check-in.

FossilOrigin-Name: 55fc25fdab61e6094289e068c343e012fec10439
This commit is contained in:
drh
2011-03-05 21:41:34 +00:00
parent 158b9cb965
commit d7255a207e
3 changed files with 12 additions and 14 deletions
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6
src/util.c
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@@ -1121,15 +1121,13 @@ int sqlite3MulInt64(i64 *pA, i64 iB){
i64 iA = *pA;
i64 iA1, iA0, iB1, iB0, r;
// if( iB==1 ){ return 0; }
// if( iA==1 ){ *pA = iB; return 0; }
iA1 = iA/TWOPOWER32;
iA0 = iA % TWOPOWER32;
iB1 = iB/TWOPOWER32;
iB0 = iB % TWOPOWER32;
if( iA1*iB1 != 0 ) return 1;
r = iA1*iB0;
if( sqlite3AddInt64(&r, iA0*iB1) ) return 1;
assert( iA1*iB0==0 || iA0*iB1==0 );
r = iA1*iB0 + iA0*iB1;
testcase( r==(-TWOPOWER31)-1 );
testcase( r==(-TWOPOWER31) );
testcase( r==TWOPOWER31 );