diff options
Diffstat (limited to 'src/util.c')
-rw-r--r-- | src/util.c | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/src/util.c b/src/util.c index ab8560839..abd36eda8 100644 --- a/src/util.c +++ b/src/util.c @@ -1750,49 +1750,3 @@ int sqlite3VListNameToNum(VList *pIn, const char *zName, int nName){ || defined(SQLITE_ENABLE_STMT_SCANSTATUS) # include "hwtime.h" #endif - -/*************************************************************************** -** Double-Double arithmetic. -** -** Reference: -** T. J. Dekker, "A Floating-Point Technique for Extending the -** Available Precision". 1971-07-26. -*/ - -/* Compute z = (i64)x */ -void sqlite3DDFromInt(i64 x, double *z){ - if( x > -4503599627370496L && x < 4503599627370496 ){ - z[0] = (double)x; - z[1] = 0.0; - }else{ - i64 y = x % 2048; - z[0] = (double)(x - y); - z[1] = (double)(x - (i64)z[0]); - } -} - -/* Compute z = x + y */ -void sqlite3DDAdd(double x, double xx, double y, double yy, double *z){ - double r, s; - r = x + y; - if( fabs(x)>fabs(y) ){ - s = x - r + y + yy + xx; - }else{ - s = y - r + x + xx + yy; - } - z[0] = r+s; - z[1] = r - z[0] + s; -} - -/* Compute z = x - y */ -void sqlite3DDSub(double x, double xx, double y, double yy, double *z){ - double r, s; - r = x - y; - if( fabs(x)>fabs(y) ){ - s = x - r - y - yy + xx; - }else{ - s = -y - r + x + xx - yy; - } - z[0] = r+s; - z[1] = r - z[0] + s; -} |