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Make use of the __buildin_OP_overflow() functions from GCC when doing

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64-bit signed integer arithmetic.

FossilOrigin-Name: 82cbebb8ee4484f13e5f48d305e20e73063f273e
This commit is contained in:
drh
2017-01-03 17:33:43 +00:00
parent 5c41d00f42
commit 4a47761e0d
3 changed files with 25 additions and 8 deletions
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15
src/util.c
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@@ -1279,6 +1279,10 @@ int sqlite3SafetyCheckSickOrOk(sqlite3 *db){
** overflow, leave *pA unchanged and return 1.
*/
int sqlite3AddInt64(i64 *pA, i64 iB){
#if !defined(SQLITE_DISABLE_INTRINSIC) \
&& defined(__GNUC__) && GCC_VERSION>=5004000
return __builtin_add_overflow(*pA, iB, pA);
#else
i64 iA = *pA;
testcase( iA==0 ); testcase( iA==1 );
testcase( iB==-1 ); testcase( iB==0 );
@@ -1293,8 +1297,13 @@ int sqlite3AddInt64(i64 *pA, i64 iB){
}
*pA += iB;
return 0;
#endif
}
int sqlite3SubInt64(i64 *pA, i64 iB){
#if !defined(SQLITE_DISABLE_INTRINSIC) \
&& defined(__GNUC__) && GCC_VERSION>=5004000
return __builtin_sub_overflow(*pA, iB, pA);
#else
testcase( iB==SMALLEST_INT64+1 );
if( iB==SMALLEST_INT64 ){
testcase( (*pA)==(-1) ); testcase( (*pA)==0 );
@@ -1304,8 +1313,13 @@ int sqlite3SubInt64(i64 *pA, i64 iB){
}else{
return sqlite3AddInt64(pA, -iB);
}
#endif
}
int sqlite3MulInt64(i64 *pA, i64 iB){
#if !defined(SQLITE_DISABLE_INTRINSIC) \
&& defined(__GNUC__) && GCC_VERSION>=5004000
return __builtin_mul_overflow(*pA, iB, pA);
#else
i64 iA = *pA;
if( iB>0 ){
if( iA>LARGEST_INT64/iB ) return 1;
@@ -1321,6 +1335,7 @@ int sqlite3MulInt64(i64 *pA, i64 iB){
}
*pA = iA*iB;
return 0;
#endif
}
/*