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101c7ee3ee
A previous commit added inline functions that provide fast(er) and correct overflow checks for signed integer math. Use them in a significant portion of backend code. There's more to touch in both backend and frontend code, but these were the easily identifiable cases. The old overflow checks are noticeable in integer heavy workloads. A secondary benefit is that getting rid of overflow checks that rely on signed integer overflow wrapping around, will allow us to get rid of -fwrapv in the future. Which in turn slows down other code. Author: Andres Freund Discussion: https://postgr.es/m/20171024103954.ztmatprlglz3rwke@alap3.anarazel.de
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*
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* contrib/btree_gist/btree_utils_num.h
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*/
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#ifndef __BTREE_UTILS_NUM_H__
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#define __BTREE_UTILS_NUM_H__
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#include "btree_gist.h"
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#include "access/gist.h"
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#include "utils/rel.h"
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#include <math.h>
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#include <float.h>
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typedef char GBT_NUMKEY;
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/* Better readable key */
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typedef struct
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{
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const GBT_NUMKEY *lower,
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*upper;
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} GBT_NUMKEY_R;
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/* for sorting */
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typedef struct
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{
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int i;
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GBT_NUMKEY *t;
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} Nsrt;
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/* type description */
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typedef struct
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{
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/* Attribs */
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enum gbtree_type t; /* data type */
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int32 size; /* size of type, 0 means variable */
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int32 indexsize; /* size of datums stored in index */
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/* Methods */
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bool (*f_gt) (const void *, const void *, FmgrInfo *); /* greater than */
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bool (*f_ge) (const void *, const void *, FmgrInfo *); /* greater or equal */
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bool (*f_eq) (const void *, const void *, FmgrInfo *); /* equal */
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bool (*f_le) (const void *, const void *, FmgrInfo *); /* less or equal */
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bool (*f_lt) (const void *, const void *, FmgrInfo *); /* less than */
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int (*f_cmp) (const void *, const void *, FmgrInfo *); /* key compare function */
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float8 (*f_dist) (const void *, const void *, FmgrInfo *); /* key distance function */
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} gbtree_ninfo;
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/*
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* Numeric btree functions
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*/
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/*
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* Note: The factor 0.49 in following macro avoids floating point overflows
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*/
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#define penalty_num(result,olower,oupper,nlower,nupper) do { \
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double tmp = 0.0F; \
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(*(result)) = 0.0F; \
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if ( (nupper) > (oupper) ) \
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tmp += ( ((double)nupper)*0.49F - ((double)oupper)*0.49F ); \
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if ( (olower) > (nlower) ) \
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tmp += ( ((double)olower)*0.49F - ((double)nlower)*0.49F ); \
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if (tmp > 0.0F) \
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{ \
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(*(result)) += FLT_MIN; \
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(*(result)) += (float) ( ((double)(tmp)) / ( (double)(tmp) + ( ((double)(oupper))*0.49F - ((double)(olower))*0.49F ) ) ); \
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(*(result)) *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1)); \
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} \
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} while (0);
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/*
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* Convert an Interval to an approximate equivalent number of seconds
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* (as a double). Here because we need it for time/timetz as well as
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* interval. See interval_cmp_internal for comparison.
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*/
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#define INTERVAL_TO_SEC(ivp) \
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(((double) (ivp)->time) / ((double) USECS_PER_SEC) + \
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(ivp)->day * (24.0 * SECS_PER_HOUR) + \
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(ivp)->month * (30.0 * SECS_PER_DAY))
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#define GET_FLOAT_DISTANCE(t, arg1, arg2) Abs( ((float8) *((const t *) (arg1))) - ((float8) *((const t *) (arg2))) )
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/*
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* check to see if a float4/8 val has underflowed or overflowed
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* borrowed from src/backend/utils/adt/float.c
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*/
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#define CHECKFLOATVAL(val, inf_is_valid, zero_is_valid) \
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do { \
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if (isinf(val) && !(inf_is_valid)) \
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ereport(ERROR, \
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(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE), \
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errmsg("value out of range: overflow"))); \
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\
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if ((val) == 0.0 && !(zero_is_valid)) \
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ereport(ERROR, \
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(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE), \
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errmsg("value out of range: underflow"))); \
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} while(0)
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extern Interval *abs_interval(Interval *a);
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extern bool gbt_num_consistent(const GBT_NUMKEY_R *key, const void *query,
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const StrategyNumber *strategy, bool is_leaf,
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const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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extern float8 gbt_num_distance(const GBT_NUMKEY_R *key, const void *query,
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bool is_leaf, const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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extern GIST_SPLITVEC *gbt_num_picksplit(const GistEntryVector *entryvec, GIST_SPLITVEC *v,
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const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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extern GISTENTRY *gbt_num_compress(GISTENTRY *entry, const gbtree_ninfo *tinfo);
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extern GISTENTRY *gbt_num_fetch(GISTENTRY *entry, const gbtree_ninfo *tinfo);
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extern void *gbt_num_union(GBT_NUMKEY *out, const GistEntryVector *entryvec,
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const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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extern bool gbt_num_same(const GBT_NUMKEY *a, const GBT_NUMKEY *b,
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const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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extern void gbt_num_bin_union(Datum *u, GBT_NUMKEY *e,
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const gbtree_ninfo *tinfo, FmgrInfo *flinfo);
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#endif
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