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Overview
| Comment: | Improvements to the layout and comments for the new round() implementation. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | round-up-2 |
| Files: | files | file ages | folders |
| SHA3-256: |
d6b1df1a224e06b1fae3c217c334bc04 |
| User & Date: | drh 2024-06-12 10:17:36 |
Context
|
2024-06-12
| ||
| 10:17 | Improvements to the layout and comments for the new round() implementation. (Leaf check-in: d6b1df1a user: drh tags: round-up-2) | |
| 00:30 | Test cases for the round() function for values within one epsilon of the 5 round-up threshold. (check-in: 552b1b10 user: drh tags: round-up-2) | |
Changes
Changes to src/func.c.
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}else{
sqlite3_int64 ii = (sqlite3_int64)(x+0.5);
return (double)ii;
}
}
#endif
/*
** Implementation of the round() function
*/
#ifndef SQLITE_OMIT_FLOATING_POINT
static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
int n = 0; /* Second argument. Digits to the right of decimal point */
double r; /* First argument. Value to be rounded */
double rX = 1.0; /* Scaling factor. pow(10,n) */
| > > > > > > > | < < > > > > > > > > | | < < < < < < < < | | 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 |
}else{
sqlite3_int64 ii = (sqlite3_int64)(x+0.5);
return (double)ii;
}
}
#endif
/*
** This is the value of the least significant bit of the significand
** relative to the total magnitude of the number for an IEEE754 binary64.
** Since the significant is 53 bits, this is pow(2,-52).
*/
#define SQLITE_DOUBLE_EPSILON 2.220446049250313080847263336181640625e-16
/*
** Implementation of the round() function
*/
#ifndef SQLITE_OMIT_FLOATING_POINT
static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
int n = 0; /* Second argument. Digits to the right of decimal point */
double r; /* First argument. Value to be rounded */
double rX = 1.0; /* Scaling factor. pow(10,n) */
double rSgn; /* Sign of the first argument */
assert( argc==1 || argc==2 );
if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
r = sqlite3_value_double(argv[0]);
if( r<0 ){
rSgn = -1.0;
r = -r;
}else{
rSgn = 1.0;
}
if( argc==2 ){
double rY = 10.0; /* Use to compute rX */
int i; /* Loop counter for computing rX */
if( SQLITE_NULL==sqlite3_value_type(argv[1]) ) return;
n = sqlite3_value_int(argv[1]);
if( n>30 ) n = 30;
if( n<0 ) n = 0;
for(i=n, rY=10; i>0; i>>=1, rY=rY*rY){
if( i&1 ) rX *= rY;
}
}
r = rSgn*sqlite3Round(r*rX + rX*r*SQLITE_DOUBLE_EPSILON)/rX;
sqlite3_result_double(context, r);
}
#endif
/*
** Allocate nByte bytes of space using sqlite3Malloc(). If the
** allocation fails, call sqlite3_result_error_nomem() to notify
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