From 84d4ea48280f6b54fdc70fe4c8b9494e3331071e Mon Sep 17 00:00:00 2001 From: Jarkko Hietaniemi Date: Wed, 21 Nov 2001 22:25:14 +0000 Subject: Implement the sort pragma. Split sort code from pp_ctl.c to pp_sort.c. Includes the quicksort stabilizing layer from John P. Linderman. -Msort=qsort or -Msort=fast is faster than without (or with -Msort=mergesort or -Msort=safe) for short random inputs, but for some reason not quite as fast as 5.6.1 qsort. More benchmarking, profiling, tuning, and optimizing definitely needed. p4raw-id: //depot/perl@13179 --- pp_sort.c | 1637 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1637 insertions(+) create mode 100644 pp_sort.c (limited to 'pp_sort.c') diff --git a/pp_sort.c b/pp_sort.c new file mode 100644 index 0000000000..d4e4d8b1cd --- /dev/null +++ b/pp_sort.c @@ -0,0 +1,1637 @@ +/* pp_sort.c + * + * Copyright (c) 1991-2001, Larry Wall + * + * You may distribute under the terms of either the GNU General Public + * License or the Artistic License, as specified in the README file. + * + */ + +/* + * ...they shuffled back towards the rear of the line. 'No, not at the + * rear!' the slave-driver shouted. 'Three files up. And stay there... + */ + +#include "EXTERN.h" +#define PERL_IN_PP_SORT_C +#include "perl.h" + +static I32 sortcv(pTHX_ SV *a, SV *b); +static I32 sortcv_stacked(pTHX_ SV *a, SV *b); +static I32 sortcv_xsub(pTHX_ SV *a, SV *b); +static I32 sv_ncmp(pTHX_ SV *a, SV *b); +static I32 sv_i_ncmp(pTHX_ SV *a, SV *b); +static I32 amagic_ncmp(pTHX_ SV *a, SV *b); +static I32 amagic_i_ncmp(pTHX_ SV *a, SV *b); +static I32 amagic_cmp(pTHX_ SV *a, SV *b); +static I32 amagic_cmp_locale(pTHX_ SV *a, SV *b); + +#define sv_cmp_static Perl_sv_cmp +#define sv_cmp_locale_static Perl_sv_cmp_locale + +#define SORTHINTS(hintsvp) \ + ((PL_hintgv && \ + (hintsvp = hv_fetch(GvHV(PL_hintgv), "SORT", 4, FALSE))) ? \ + (I32)SvIV(*hintsvp) : 0) + +/* + * The mergesort implementation is by Peter M. Mcilroy . + * + * The original code was written in conjunction with BSD Computer Software + * Research Group at University of California, Berkeley. + * + * See also: "Optimistic Merge Sort" (SODA '92) + * + * The integration to Perl is by John P. Linderman . + * + * The code can be distributed under the same terms as Perl itself. + * + */ + +#ifdef TESTHARNESS +#include +typedef void SV; +#define pTHX_ +#define STATIC +#define New(ID,VAR,N,TYPE) VAR=(TYPE *)malloc((N)*sizeof(TYPE)) +#define Safefree(VAR) free(VAR) +typedef int (*SVCOMPARE_t) (pTHX_ SV*, SV*); +#endif /* TESTHARNESS */ + +typedef char * aptr; /* pointer for arithmetic on sizes */ +typedef SV * gptr; /* pointers in our lists */ + +/* Binary merge internal sort, with a few special mods +** for the special perl environment it now finds itself in. +** +** Things that were once options have been hotwired +** to values suitable for this use. In particular, we'll always +** initialize looking for natural runs, we'll always produce stable +** output, and we'll always do Peter McIlroy's binary merge. +*/ + +/* Pointer types for arithmetic and storage and convenience casts */ + +#define APTR(P) ((aptr)(P)) +#define GPTP(P) ((gptr *)(P)) +#define GPPP(P) ((gptr **)(P)) + + +/* byte offset from pointer P to (larger) pointer Q */ +#define BYTEOFF(P, Q) (APTR(Q) - APTR(P)) + +#define PSIZE sizeof(gptr) + +/* If PSIZE is power of 2, make PSHIFT that power, if that helps */ + +#ifdef PSHIFT +#define PNELEM(P, Q) (BYTEOFF(P,Q) >> (PSHIFT)) +#define PNBYTE(N) ((N) << (PSHIFT)) +#define PINDEX(P, N) (GPTP(APTR(P) + PNBYTE(N))) +#else +/* Leave optimization to compiler */ +#define PNELEM(P, Q) (GPTP(Q) - GPTP(P)) +#define PNBYTE(N) ((N) * (PSIZE)) +#define PINDEX(P, N) (GPTP(P) + (N)) +#endif + +/* Pointer into other corresponding to pointer into this */ +#define POTHER(P, THIS, OTHER) GPTP(APTR(OTHER) + BYTEOFF(THIS,P)) + +#define FROMTOUPTO(src, dst, lim) do *dst++ = *src++; while(src= 2 * PTHRESH. We only try to form long runs when +** PTHRESH adjacent pairs compare in the same way, suggesting overall order. +** +** Unless otherwise specified, pair pointers address the first of two elements. +** +** b and b+1 are a pair that compare with sense ``sense''. +** b is the ``bottom'' of adjacent pairs that might form a longer run. +** +** p2 parallels b in the list2 array, where runs are defined by +** a pointer chain. +** +** t represents the ``top'' of the adjacent pairs that might extend +** the run beginning at b. Usually, t addresses a pair +** that compares with opposite sense from (b,b+1). +** However, it may also address a singleton element at the end of list1, +** or it may be equal to ``last'', the first element beyond list1. +** +** r addresses the Nth pair following b. If this would be beyond t, +** we back it off to t. Only when r is less than t do we consider the +** run long enough to consider checking. +** +** q addresses a pair such that the pairs at b through q already form a run. +** Often, q will equal b, indicating we only are sure of the pair itself. +** However, a search on the previous cycle may have revealed a longer run, +** so q may be greater than b. +** +** p is used to work back from a candidate r, trying to reach q, +** which would mean b through r would be a run. If we discover such a run, +** we start q at r and try to push it further towards t. +** If b through r is NOT a run, we detect the wrong order at (p-1,p). +** In any event, after the check (if any), we have two main cases. +** +** 1) Short run. b <= q < p <= r <= t. +** b through q is a run (perhaps trivial) +** q through p are uninteresting pairs +** p through r is a run +** +** 2) Long run. b < r <= q < t. +** b through q is a run (of length >= 2 * PTHRESH) +** +** Note that degenerate cases are not only possible, but likely. +** For example, if the pair following b compares with opposite sense, +** then b == q < p == r == t. +*/ + + +static void +dynprep(pTHX_ gptr *list1, gptr *list2, size_t nmemb, SVCOMPARE_t cmp) +{ + int sense; + register gptr *b, *p, *q, *t, *p2; + register gptr c, *last, *r; + gptr *savep; + + b = list1; + last = PINDEX(b, nmemb); + sense = (cmp(aTHX_ *b, *(b+1)) > 0); + for (p2 = list2; b < last; ) { + /* We just started, or just reversed sense. + ** Set t at end of pairs with the prevailing sense. + */ + for (p = b+2, t = p; ++p < last; t = ++p) { + if ((cmp(aTHX_ *t, *p) > 0) != sense) break; + } + q = b; + /* Having laid out the playing field, look for long runs */ + do { + p = r = b + (2 * PTHRESH); + if (r >= t) p = r = t; /* too short to care about */ + else { + while (((cmp(aTHX_ *(p-1), *p) > 0) == sense) && + ((p -= 2) > q)); + if (p <= q) { + /* b through r is a (long) run. + ** Extend it as far as possible. + */ + p = q = r; + while (((p += 2) < t) && + ((cmp(aTHX_ *(p-1), *p) > 0) == sense)) q = p; + r = p = q + 2; /* no simple pairs, no after-run */ + } + } + if (q > b) { /* run of greater than 2 at b */ + savep = p; + p = q += 2; + /* pick up singleton, if possible */ + if ((p == t) && + ((t + 1) == last) && + ((cmp(aTHX_ *(p-1), *p) > 0) == sense)) + savep = r = p = q = last; + p2 = NEXT(p2) = p2 + (p - b); + if (sense) while (b < --p) { + c = *b; + *b++ = *p; + *p = c; + } + p = savep; + } + while (q < p) { /* simple pairs */ + p2 = NEXT(p2) = p2 + 2; + if (sense) { + c = *q++; + *(q-1) = *q; + *q++ = c; + } else q += 2; + } + if (((b = p) == t) && ((t+1) == last)) { + NEXT(p2) = p2 + 1; + b++; + } + q = r; + } while (b < t); + sense = !sense; + } + return; +} + + +/* Overview of bmerge variables: +** +** list1 and list2 address the main and auxiliary arrays. +** They swap identities after each merge pass. +** Base points to the original list1, so we can tell if +** the pointers ended up where they belonged (or must be copied). +** +** When we are merging two lists, f1 and f2 are the next elements +** on the respective lists. l1 and l2 mark the end of the lists. +** tp2 is the current location in the merged list. +** +** p1 records where f1 started. +** After the merge, a new descriptor is built there. +** +** p2 is a ``parallel'' pointer in (what starts as) descriptor space. +** It is used to identify and delimit the runs. +** +** In the heat of determining where q, the greater of the f1/f2 elements, +** belongs in the other list, b, t and p, represent bottom, top and probe +** locations, respectively, in the other list. +** They make convenient temporary pointers in other places. +*/ + +STATIC void +S_mergesortsv(pTHX_ gptr *list1, size_t nmemb, SVCOMPARE_t cmp) +{ + int i, run; + int sense; + register gptr *f1, *f2, *t, *b, *p, *tp2, *l1, *l2, *q; + gptr *aux, *list2, *p2, *last; + gptr *base = list1; + gptr *p1; + + if (nmemb <= 1) return; /* sorted trivially */ + New(799,list2,nmemb,gptr); /* allocate auxilliary array */ + aux = list2; + dynprep(aTHX_ list1, list2, nmemb, cmp); + last = PINDEX(list2, nmemb); + while (NEXT(list2) != last) { + /* More than one run remains. Do some merging to reduce runs. */ + l2 = p1 = list1; + for (tp2 = p2 = list2; p2 != last;) { + /* The new first run begins where the old second list ended. + ** Use the p2 ``parallel'' pointer to identify the end of the run. + */ + f1 = l2; + t = NEXT(p2); + f2 = l1 = POTHER(t, list2, list1); + if (t != last) t = NEXT(t); + l2 = POTHER(t, list2, list1); + p2 = t; + while (f1 < l1 && f2 < l2) { + /* If head 1 is larger than head 2, find ALL the elements + ** in list 2 strictly less than head1, write them all, + ** then head 1. Then compare the new heads, and repeat, + ** until one or both lists are exhausted. + ** + ** In all comparisons (after establishing + ** which head to merge) the item to merge + ** (at pointer q) is the first operand of + ** the comparison. When we want to know + ** if ``q is strictly less than the other'', + ** we can't just do + ** cmp(q, other) < 0 + ** because stability demands that we treat equality + ** as high when q comes from l2, and as low when + ** q was from l1. So we ask the question by doing + ** cmp(q, other) <= sense + ** and make sense == 0 when equality should look low, + ** and -1 when equality should look high. + */ + + + if (cmp(aTHX_ *f1, *f2) <= 0) { + q = f2; b = f1; t = l1; + sense = -1; + } else { + q = f1; b = f2; t = l2; + sense = 0; + } + + + /* ramp up + ** + ** Leave t at something strictly + ** greater than q (or at the end of the list), + ** and b at something strictly less than q. + */ + for (i = 1, run = 0 ;;) { + if ((p = PINDEX(b, i)) >= t) { + /* off the end */ + if (((p = PINDEX(t, -1)) > b) && + (cmp(aTHX_ *q, *p) <= sense)) + t = p; + else b = p; + break; + } else if (cmp(aTHX_ *q, *p) <= sense) { + t = p; + break; + } else b = p; + if (++run >= RTHRESH) i += i; + } + + + /* q is known to follow b and must be inserted before t. + ** Increment b, so the range of possibilities is [b,t). + ** Round binary split down, to favor early appearance. + ** Adjust b and t until q belongs just before t. + */ + + b++; + while (b < t) { + p = PINDEX(b, (PNELEM(b, t) - 1) / 2); + if (cmp(aTHX_ *q, *p) <= sense) { + t = p; + } else b = p + 1; + } + + + /* Copy all the strictly low elements */ + + if (q == f1) { + FROMTOUPTO(f2, tp2, t); + *tp2++ = *f1++; + } else { + FROMTOUPTO(f1, tp2, t); + *tp2++ = *f2++; + } + } + + + /* Run out remaining list */ + if (f1 == l1) { + if (f2 < l2) FROMTOUPTO(f2, tp2, l2); + } else FROMTOUPTO(f1, tp2, l1); + p1 = NEXT(p1) = POTHER(tp2, list2, list1); + } + t = list1; + list1 = list2; + list2 = t; + last = PINDEX(list2, nmemb); + } + if (base == list2) { + last = PINDEX(list1, nmemb); + FROMTOUPTO(list1, list2, last); + } + Safefree(aux); + return; +} + +/* + * The quicksort implementation was derived from source code contributed + * by Tom Horsley. + * + * NOTE: this code was derived from Tom Horsley's qsort replacement + * and should not be confused with the original code. + */ + +/* Copyright (C) Tom Horsley, 1997. All rights reserved. + + Permission granted to distribute under the same terms as perl which are + (briefly): + + This program is free software; you can redistribute it and/or modify + it under the terms of either: + + a) the GNU General Public License as published by the Free + Software Foundation; either version 1, or (at your option) any + later version, or + + b) the "Artistic License" which comes with this Kit. + + Details on the perl license can be found in the perl source code which + may be located via the www.perl.com web page. + + This is the most wonderfulest possible qsort I can come up with (and + still be mostly portable) My (limited) tests indicate it consistently + does about 20% fewer calls to compare than does the qsort in the Visual + C++ library, other vendors may vary. + + Some of the ideas in here can be found in "Algorithms" by Sedgewick, + others I invented myself (or more likely re-invented since they seemed + pretty obvious once I watched the algorithm operate for a while). + + Most of this code was written while watching the Marlins sweep the Giants + in the 1997 National League Playoffs - no Braves fans allowed to use this + code (just kidding :-). + + I realize that if I wanted to be true to the perl tradition, the only + comment in this file would be something like: + + ...they shuffled back towards the rear of the line. 'No, not at the + rear!' the slave-driver shouted. 'Three files up. And stay there... + + However, I really needed to violate that tradition just so I could keep + track of what happens myself, not to mention some poor fool trying to + understand this years from now :-). +*/ + +/* ********************************************************** Configuration */ + +#ifndef QSORT_ORDER_GUESS +#define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */ +#endif + +/* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for + future processing - a good max upper bound is log base 2 of memory size + (32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can + safely be smaller than that since the program is taking up some space and + most operating systems only let you grab some subset of contiguous + memory (not to mention that you are normally sorting data larger than + 1 byte element size :-). +*/ +#ifndef QSORT_MAX_STACK +#define QSORT_MAX_STACK 32 +#endif + +/* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort. + Anything bigger and we use qsort. If you make this too small, the qsort + will probably break (or become less efficient), because it doesn't expect + the middle element of a partition to be the same as the right or left - + you have been warned). +*/ +#ifndef QSORT_BREAK_EVEN +#define QSORT_BREAK_EVEN 6 +#endif + +/* ************************************************************* Data Types */ + +/* hold left and right index values of a partition waiting to be sorted (the + partition includes both left and right - right is NOT one past the end or + anything like that). +*/ +struct partition_stack_entry { + int left; + int right; +#ifdef QSORT_ORDER_GUESS + int qsort_break_even; +#endif +}; + +/* ******************************************************* Shorthand Macros */ + +/* Note that these macros will be used from inside the qsort function where + we happen to know that the variable 'elt_size' contains the size of an + array element and the variable 'temp' points to enough space to hold a + temp element and the variable 'array' points to the array being sorted + and 'compare' is the pointer to the compare routine. + + Also note that there are very many highly architecture specific ways + these might be sped up, but this is simply the most generally portable + code I could think of. +*/ + +/* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2 +*/ +#define qsort_cmp(elt1, elt2) \ + ((*compare)(aTHX_ array[elt1], array[elt2])) + +#ifdef QSORT_ORDER_GUESS +#define QSORT_NOTICE_SWAP swapped++; +#else +#define QSORT_NOTICE_SWAP +#endif + +/* swaps contents of array elements elt1, elt2. +*/ +#define qsort_swap(elt1, elt2) \ + STMT_START { \ + QSORT_NOTICE_SWAP \ + temp = array[elt1]; \ + array[elt1] = array[elt2]; \ + array[elt2] = temp; \ + } STMT_END + +/* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets + elt3 and elt3 gets elt1. +*/ +#define qsort_rotate(elt1, elt2, elt3) \ + STMT_START { \ + QSORT_NOTICE_SWAP \ + temp = array[elt1]; \ + array[elt1] = array[elt2]; \ + array[elt2] = array[elt3]; \ + array[elt3] = temp; \ + } STMT_END + +/* ************************************************************ Debug stuff */ + +#ifdef QSORT_DEBUG + +static void +break_here() +{ + return; /* good place to set a breakpoint */ +} + +#define qsort_assert(t) (void)( (t) || (break_here(), 0) ) + +static void +doqsort_all_asserts( + void * array, + size_t num_elts, + size_t elt_size, + int (*compare)(const void * elt1, const void * elt2), + int pc_left, int pc_right, int u_left, int u_right) +{ + int i; + + qsort_assert(pc_left <= pc_right); + qsort_assert(u_right < pc_left); + qsort_assert(pc_right < u_left); + for (i = u_right + 1; i < pc_left; ++i) { + qsort_assert(qsort_cmp(i, pc_left) < 0); + } + for (i = pc_left; i < pc_right; ++i) { + qsort_assert(qsort_cmp(i, pc_right) == 0); + } + for (i = pc_right + 1; i < u_left; ++i) { + qsort_assert(qsort_cmp(pc_right, i) < 0); + } +} + +#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \ + doqsort_all_asserts(array, num_elts, elt_size, compare, \ + PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) + +#else + +#define qsort_assert(t) ((void)0) + +#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0) + +#endif + +/* ****************************************************************** qsort */ + +STATIC void /* the standard unstable (u) quicksort (qsort) */ +S_qsortsvu(pTHX_ SV ** array, size_t num_elts, SVCOMPARE_t compare) +{ + register SV * temp; + + struct partition_stack_entry partition_stack[QSORT_MAX_STACK]; + int next_stack_entry = 0; + + int part_left; + int part_right; +#ifdef QSORT_ORDER_GUESS + int qsort_break_even; + int swapped; +#endif + + /* Make sure we actually have work to do. + */ + if (num_elts <= 1) { + return; + } + + /* Setup the initial partition definition and fall into the sorting loop + */ + part_left = 0; + part_right = (int)(num_elts - 1); +#ifdef QSORT_ORDER_GUESS + qsort_break_even = QSORT_BREAK_EVEN; +#else +#define qsort_break_even QSORT_BREAK_EVEN +#endif + for ( ; ; ) { + if ((part_right - part_left) >= qsort_break_even) { + /* OK, this is gonna get hairy, so lets try to document all the + concepts and abbreviations and variables and what they keep + track of: + + pc: pivot chunk - the set of array elements we accumulate in the + middle of the partition, all equal in value to the original + pivot element selected. The pc is defined by: + + pc_left - the leftmost array index of the pc + pc_right - the rightmost array index of the pc + + we start with pc_left == pc_right and only one element + in the pivot chunk (but it can grow during the scan). + + u: uncompared elements - the set of elements in the partition + we have not yet compared to the pivot value. There are two + uncompared sets during the scan - one to the left of the pc + and one to the right. + + u_right - the rightmost index of the left side's uncompared set + u_left - the leftmost index of the right side's uncompared set + + The leftmost index of the left sides's uncompared set + doesn't need its own variable because it is always defined + by the leftmost edge of the whole partition (part_left). The + same goes for the rightmost edge of the right partition + (part_right). + + We know there are no uncompared elements on the left once we + get u_right < part_left and no uncompared elements on the + right once u_left > part_right. When both these conditions + are met, we have completed the scan of the partition. + + Any elements which are between the pivot chunk and the + uncompared elements should be less than the pivot value on + the left side and greater than the pivot value on the right + side (in fact, the goal of the whole algorithm is to arrange + for that to be true and make the groups of less-than and + greater-then elements into new partitions to sort again). + + As you marvel at the complexity of the code and wonder why it + has to be so confusing. Consider some of the things this level + of confusion brings: + + Once I do a compare, I squeeze every ounce of juice out of it. I + never do compare calls I don't have to do, and I certainly never + do redundant calls. + + I also never swap any elements unless I can prove there is a + good reason. Many sort algorithms will swap a known value with + an uncompared value just to get things in the right place (or + avoid complexity :-), but that uncompared value, once it gets + compared, may then have to be swapped again. A lot of the + complexity of this code is due to the fact that it never swaps + anything except compared values, and it only swaps them when the + compare shows they are out of position. + */ + int pc_left, pc_right; + int u_right, u_left; + + int s; + + pc_left = ((part_left + part_right) / 2); + pc_right = pc_left; + u_right = pc_left - 1; + u_left = pc_right + 1; + + /* Qsort works best when the pivot value is also the median value + in the partition (unfortunately you can't find the median value + without first sorting :-), so to give the algorithm a helping + hand, we pick 3 elements and sort them and use the median value + of that tiny set as the pivot value. + + Some versions of qsort like to use the left middle and right as + the 3 elements to sort so they can insure the ends of the + partition will contain values which will stop the scan in the + compare loop, but when you have to call an arbitrarily complex + routine to do a compare, its really better to just keep track of + array index values to know when you hit the edge of the + partition and avoid the extra compare. An even better reason to + avoid using a compare call is the fact that you can drop off the + edge of the array if someone foolishly provides you with an + unstable compare function that doesn't always provide consistent + results. + + So, since it is simpler for us to compare the three adjacent + elements in the middle of the partition, those are the ones we + pick here (conveniently pointed at by u_right, pc_left, and + u_left). The values of the left, center, and right elements + are refered to as l c and r in the following comments. + */ + +#ifdef QSORT_ORDER_GUESS + swapped = 0; +#endif + s = qsort_cmp(u_right, pc_left); + if (s < 0) { + /* l < c */ + s = qsort_cmp(pc_left, u_left); + /* if l < c, c < r - already in order - nothing to do */ + if (s == 0) { + /* l < c, c == r - already in order, pc grows */ + ++pc_right; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else if (s > 0) { + /* l < c, c > r - need to know more */ + s = qsort_cmp(u_right, u_left); + if (s < 0) { + /* l < c, c > r, l < r - swap c & r to get ordered */ + qsort_swap(pc_left, u_left); + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else if (s == 0) { + /* l < c, c > r, l == r - swap c&r, grow pc */ + qsort_swap(pc_left, u_left); + --pc_left; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else { + /* l < c, c > r, l > r - make lcr into rlc to get ordered */ + qsort_rotate(pc_left, u_right, u_left); + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } + } + } else if (s == 0) { + /* l == c */ + s = qsort_cmp(pc_left, u_left); + if (s < 0) { + /* l == c, c < r - already in order, grow pc */ + --pc_left; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else if (s == 0) { + /* l == c, c == r - already in order, grow pc both ways */ + --pc_left; + ++pc_right; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else { + /* l == c, c > r - swap l & r, grow pc */ + qsort_swap(u_right, u_left); + ++pc_right; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } + } else { + /* l > c */ + s = qsort_cmp(pc_left, u_left); + if (s < 0) { + /* l > c, c < r - need to know more */ + s = qsort_cmp(u_right, u_left); + if (s < 0) { + /* l > c, c < r, l < r - swap l & c to get ordered */ + qsort_swap(u_right, pc_left); + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else if (s == 0) { + /* l > c, c < r, l == r - swap l & c, grow pc */ + qsort_swap(u_right, pc_left); + ++pc_right; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else { + /* l > c, c < r, l > r - rotate lcr into crl to order */ + qsort_rotate(u_right, pc_left, u_left); + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } + } else if (s == 0) { + /* l > c, c == r - swap ends, grow pc */ + qsort_swap(u_right, u_left); + --pc_left; + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } else { + /* l > c, c > r - swap ends to get in order */ + qsort_swap(u_right, u_left); + qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1); + } + } + /* We now know the 3 middle elements have been compared and + arranged in the desired order, so we can shrink the uncompared + sets on both sides + */ + --u_right; + ++u_left; + qsort_all_asserts(pc_left, pc_right, u_left, u_right); + + /* The above massive nested if was the simple part :-). We now have + the middle 3 elements ordered and we need to scan through the + uncompared sets on either side, swapping elements that are on + the wrong side or simply shuffling equal elements around to get + all equal elements into the pivot chunk. + */ + + for ( ; ; ) { + int still_work_on_left; + int still_work_on_right; + + /* Scan the uncompared values on the left. If I find a value + equal to the pivot value, move it over so it is adjacent to + the pivot chunk and expand the pivot chunk. If I find a value + less than the pivot value, then just leave it - its already + on the correct side of the partition. If I find a greater + value, then stop the scan. + */ + while ((still_work_on_left = (u_right >= part_left))) { + s = qsort_cmp(u_right, pc_left); + if (s < 0) { + --u_right; + } else if (s == 0) { + --pc_left; + if (pc_left != u_right) { + qsort_swap(u_right, pc_left); + } + --u_right; + } else { + break; + } + qsort_assert(u_right < pc_left); + qsort_assert(pc_left <= pc_right); + qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0); + qsort_assert(qsort_cmp(pc_left, pc_right) == 0); + } + + /* Do a mirror image scan of uncompared values on the right + */ + while ((still_work_on_right = (u_left <= part_right))) { + s = qsort_cmp(pc_right, u_left); + if (s < 0) { + ++u_left; + } else if (s == 0) { + ++pc_right; + if (pc_right != u_left) { + qsort_swap(pc_right, u_left); + } + ++u_left; + } else { + break; + } + qsort_assert(u_left > pc_right); + qsort_assert(pc_left <= pc_right); + qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0); + qsort_assert(qsort_cmp(pc_left, pc_right) == 0); + } + + if (still_work_on_left) { + /* I know I have a value on the left side which needs to be + on the right side, but I need to know more to decide + exactly the best thing to do with it. + */ + if (still_work_on_right) { + /* I know I have values on both side which are out of + position. This is a big win because I kill two birds + with one swap (so to speak). I can advance the + uncompared pointers on both sides after swapping both + of them into the right place. + */ + qsort_swap(u_right, u_left); + --u_right; + ++u_left; + qsort_all_asserts(pc_left, pc_right, u_left, u_right); + } else { + /* I have an out of position value on the left, but the + right is fully scanned, so I "slide" the pivot chunk + and any less-than values left one to make room for the + greater value over on the right. If the out of position + value is immediately adjacent to the pivot chunk (there + are no less-than values), I can do that with a swap, + otherwise, I have to rotate one of the less than values + into the former position of the out of position value + and the right end of the pivot chunk into the left end + (got all that?). + */ + --pc_left; + if (pc_left == u_right) { + qsort_swap(u_right, pc_right); + qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1); + } else { + qsort_rotate(u_right, pc_left, pc_right); + qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1); + } + --pc_right; + --u_right; + } + } else if (still_work_on_right) { + /* Mirror image of complex case above: I have an out of + position value on the right, but the left is fully + scanned, so I need to shuffle things around to make room + for the right value on the left. + */ + ++pc_right; + if (pc_right == u_left) { + qsort_swap(u_left, pc_left); + qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right); + } else { + qsort_rotate(pc_right, pc_left, u_left); + qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right); + } + ++pc_left; + ++u_left; + } else { + /* No more scanning required on either side of partition, + break out of loop and figure out next set of partitions + */ + break; + } + } + + /* The elements in the pivot chunk are now in the right place. They + will never move or be compared again. All I have to do is decide + what to do with the stuff to the left and right of the pivot + chunk. + + Notes on the QSORT_ORDER_GUESS ifdef code: + + 1. If I just built these partitions without swapping any (or + very many) elements, there is a chance that the elements are + already ordered properly (being properly ordered will + certainly result in no swapping, but the converse can't be + proved :-). + + 2. A (properly written) insertion sort will run faster on + already ordered data than qsort will. + + 3. Perhaps there is some way to make a good guess about + switching to an insertion sort earlier than partition size 6 + (for instance - we could save the partition size on the stack + and increase the size each time we find we didn't swap, thus + switching to insertion sort earlier for partitions with a + history of not swapping). + + 4. Naturally, if I just switch right away, it will make + artificial benchmarks with pure ascending (or descending) + data look really good, but is that a good reason in general? + Hard to say... + */ + +#ifdef QSORT_ORDER_GUESS + if (swapped < 3) { +#if QSORT_ORDER_GUESS == 1 + qsort_break_even = (part_right - part_left) + 1; +#endif +#if QSORT_ORDER_GUESS == 2 + qsort_break_even *= 2; +#endif +#if QSORT_ORDER_GUESS == 3 + int prev_break = qsort_break_even; + qsort_break_even *= qsort_break_even; + if (qsort_break_even < prev_break) { + qsort_break_even = (part_right - part_left) + 1; + } +#endif + } else { + qsort_break_even = QSORT_BREAK_EVEN; + } +#endif + + if (part_left < pc_left) { + /* There are elements on the left which need more processing. + Check the right as well before deciding what to do. + */ + if (pc_right < part_right) { + /* We have two partitions to be sorted. Stack the biggest one + and process the smallest one on the next iteration. This + minimizes the stack height by insuring that any additional + stack entries must come from the smallest partition which + (because it is smallest) will have the fewest + opportunities to generate additional stack entries. + */ + if ((part_right - pc_right) > (pc_left - part_left)) { + /* stack the right partition, process the left */ + partition_stack[next_stack_entry].left = pc_right + 1; + partition_stack[next_stack_entry].right = part_right; +#ifdef QSORT_ORDER_GUESS + partition_stack[next_stack_entry].qsort_break_even = qsort_break_even; +#endif + part_right = pc_left - 1; + } else { + /* stack the left partition, process the right */ + partition_stack[next_stack_entry].left = part_left; + partition_stack[next_stack_entry].right = pc_left - 1; +#ifdef QSORT_ORDER_GUESS + partition_stack[next_stack_entry].qsort_break_even = qsort_break_even; +#endif + part_left = pc_right + 1; + } + qsort_assert(next_stack_entry < QSORT_MAX_STACK); + ++next_stack_entry; + } else { + /* The elements on the left are the only remaining elements + that need sorting, arrange for them to be processed as the + next partition. + */ + part_right = pc_left - 1; + } + } else if (pc_right < part_right) { + /* There is only one chunk on the right to be sorted, make it + the new partition and loop back around. + */ + part_left = pc_right + 1; + } else { + /* This whole partition wound up in the pivot chunk, so + we need to get a new partition off the stack. + */ + if (next_stack_entry == 0) { + /* the stack is empty - we are done */ + break; + } + --next_stack_entry; + part_left = partition_stack[next_stack_entry].left; + part_right = partition_stack[next_stack_entry].right; +#ifdef QSORT_ORDER_GUESS + qsort_break_even = partition_stack[next_stack_entry].qsort_break_even; +#endif + } + } else { + /* This partition is too small to fool with qsort complexity, just + do an ordinary insertion sort to minimize overhead. + */ + int i; + /* Assume 1st element is in right place already, and start checking + at 2nd element to see where it should be inserted. + */ + for (i = part_left + 1; i <= part_right; ++i) { + int j; + /* Scan (backwards - just in case 'i' is already in right place) + through the elements already sorted to see if the ith element + belongs ahead of one of them. + */ + for (j = i - 1; j >= part_left; --j) { + if (qsort_cmp(i, j) >= 0) { + /* i belongs right after j + */ + break; + } + } + ++j; + if (j != i) { + /* Looks like we really need to move some things + */ + int k; + temp = array[i]; + for (k = i - 1; k >= j; --k) + array[k + 1] = array[k]; + array[j] = temp; + } + } + + /* That partition is now sorted, grab the next one, or get out + of the loop if there aren't any more. + */ + + if (next_stack_entry == 0) { + /* the stack is empty - we are done */ + break; + } + --next_stack_entry; + part_left = partition_stack[next_stack_entry].left; + part_right = partition_stack[next_stack_entry].right; +#ifdef QSORT_ORDER_GUESS + qsort_break_even = partition_stack[next_stack_entry].qsort_break_even; +#endif + } + } + + /* Believe it or not, the array is sorted at this point! */ +} + +#ifndef SMALLSORT +#define SMALLSORT (200) +#endif + +/* Stabilize what is, presumably, an otherwise unstable sort method. + * We do that by allocating (or having on hand) an array of pointers + * that is the same size as the original array of elements to be sorted. + * We initialize this parallel array with the addresses of the original + * array elements. This indirection can make you crazy. + * Some pictures can help. After initializing, we have + * + * indir list1 + * +----+ +----+ + * | | --------------> | | ------> first element to be sorted + * +----+ +----+ + * | | --------------> | | ------> second element to be sorted + * +----+ +----+ + * | | --------------> | | ------> third element to be sorted + * +----+ +----+ + * ... + * +----+ +----+ + * | | --------------> | | ------> n-1st element to be sorted + * +----+ +----+ + * | | --------------> | | ------> n-th element to be sorted + * +----+ +----+ + * + * During the sort phase, we leave the elements of list1 where they are, + * and sort the pointers in the indirect array in the same order determined + * by the original comparison routine on the elements pointed to. + * Because we don't move the elements of list1 around through + * this phase, we can break ties on elements that compare equal + * using their address in the list1 array, ensuring stabilty. + * This leaves us with something looking like + * + * indir list1 + * +----+ +----+ + * | | --+ +---> | | ------> first element to be sorted + * +----+ | | +----+ + * | | --|-------|---> | | ------> second element to be sorted + * +----+ | | +----+ + * | | --|-------+ +-> | | ------> third element to be sorted + * +----+ | | +----+ + * ... + * +----+ | | | | +----+ + * | | ---|-+ | +--> | | ------> n-1st element to be sorted + * +----+ | | +----+ + * | | ---+ +----> | | ------> n-th element to be sorted + * +----+ +----+ + * + * where the i-th element of the indirect array points to the element + * that should be i-th in the sorted array. After the sort phase, + * we have to put the elements of list1 into the places + * dictated by the indirect array. + */ + +static SVCOMPARE_t RealCmp; + +static I32 +cmpindir(pTHX_ gptr a, gptr b) +{ + I32 sense; + gptr *ap = (gptr *)a; + gptr *bp = (gptr *)b; + + if ((sense = RealCmp(aTHX_ *ap, *bp)) == 0) + sense = (ap > bp) ? 1 : ((ap < bp) ? -1 : 0); + return sense; +} + +STATIC void +S_qsortsv(pTHX_ gptr *list1, size_t nmemb, SVCOMPARE_t cmp) +{ + SV **hintsvp; + + if (SORTHINTS(hintsvp) & HINT_SORT_FAST) + S_qsortsvu(aTHX_ list1, nmemb, cmp); + else { + register gptr **pp, *q; + register size_t n, j, i; + gptr *small[SMALLSORT], **indir, tmp; + SVCOMPARE_t savecmp; + if (nmemb <= 1) return; /* sorted trivially */ + + /* Small arrays can use the stack, big ones must be allocated */ + if (nmemb <= SMALLSORT) indir = small; + else { New(1799, indir, nmemb, gptr *); } + + /* Copy pointers to original array elements into indirect array */ + for (n = nmemb, pp = indir, q = list1; n--; ) *pp++ = q++; + + savecmp = RealCmp; /* Save current comparison routine, if any */ + RealCmp = cmp; /* Put comparison routine where cmpindir can find it */ + + /* sort, with indirection */ + S_qsortsvu(aTHX_ (gptr *)indir, nmemb, cmpindir); + + pp = indir; + q = list1; + for (n = nmemb; n--; ) { + /* Assert A: all elements of q with index > n are already + * in place. This is vacuosly true at the start, and we + * put element n where it belongs below (if it wasn't + * already where it belonged). Assert B: we only move + * elements that aren't where they belong, + * so, by A, we never tamper with elements above n. + */ + j = pp[n] - q; /* This sets j so that q[j] is + * at pp[n]. *pp[j] belongs in + * q[j], by construction. + */ + if (n != j) { /* all's well if n == j */ + tmp = q[j]; /* save what's in q[j] */ + do { + q[j] = *pp[j]; /* put *pp[j] where it belongs */ + i = pp[j] - q; /* the index in q of the element + * just moved */ + pp[j] = q + j; /* this is ok now */ + } while ((j = i) != n); + /* There are only finitely many (nmemb) addresses + * in the pp array. + * So we must eventually revisit an index we saw before. + * Suppose the first revisited index is k != n. + * An index is visited because something else belongs there. + * If we visit k twice, then two different elements must + * belong in the same place, which cannot be. + * So j must get back to n, the loop terminates, + * and we put the saved element where it belongs. + */ + q[n] = tmp; /* put what belongs into + * the n-th element */ + } + } + + /* free iff allocated */ + if (indir != small) { Safefree(indir); } + /* restore prevailing comparison routine */ + RealCmp = savecmp; + } +} + +/* +=for apidoc sortsv + +Sort an array. Here is an example: + + sortsv(AvARRAY(av), av_len(av)+1, Perl_sv_cmp_locale); + +=cut +*/ + +void +Perl_sortsv(pTHX_ SV **array, size_t nmemb, SVCOMPARE_t cmp) +{ + void (*sortsvp)(pTHX_ SV **array, size_t nmemb, SVCOMPARE_t cmp) = + S_mergesortsv; + SV **hintsvp; + I32 hints; + + if ((hints = SORTHINTS(hintsvp))) { + if (hints & HINT_SORT_QUICKSORT) + sortsvp = S_qsortsv; + else { + if (hints & HINT_SORT_MERGESORT) + sortsvp = S_mergesortsv; + else + sortsvp = S_mergesortsv; + } + } + + sortsvp(aTHX_ array, nmemb, cmp); +} + +PP(pp_sort) +{ + dSP; dMARK; dORIGMARK; + register SV **up; + SV **myorigmark = ORIGMARK; + register I32 max; + HV *stash; + GV *gv; + CV *cv = 0; + I32 gimme = GIMME; + OP* nextop = PL_op->op_next; + I32 overloading = 0; + bool hasargs = FALSE; + I32 is_xsub = 0; + + if (gimme != G_ARRAY) { + SP = MARK; + RETPUSHUNDEF; + } + + ENTER; + SAVEVPTR(PL_sortcop); + if (PL_op->op_flags & OPf_STACKED) { + if (PL_op->op_flags & OPf_SPECIAL) { + OP *kid = cLISTOP->op_first->op_sibling; /* pass pushmark */ + kid = kUNOP->op_first; /* pass rv2gv */ + kid = kUNOP->op_first; /* pass leave */ + PL_sortcop = kid->op_next; + stash = CopSTASH(PL_curcop); + } + else { + cv = sv_2cv(*++MARK, &stash, &gv, 0); + if (cv && SvPOK(cv)) { + STRLEN n_a; + char *proto = SvPV((SV*)cv, n_a); + if (proto && strEQ(proto, "$$")) { + hasargs = TRUE; + } + } + if (!(cv && CvROOT(cv))) { + if (cv && CvXSUB(cv)) { + is_xsub = 1; + } + else if (gv) { + SV *tmpstr = sv_newmortal(); + gv_efullname3(tmpstr, gv, Nullch); + DIE(aTHX_ "Undefined sort subroutine \"%s\" called", + SvPVX(tmpstr)); + } + else { + DIE(aTHX_ "Undefined subroutine in sort"); + } + } + + if (is_xsub) + PL_sortcop = (OP*)cv; + else { + PL_sortcop = CvSTART(cv); + SAVEVPTR(CvROOT(cv)->op_ppaddr); + CvROOT(cv)->op_ppaddr = PL_ppaddr[OP_NULL]; + + SAVEVPTR(PL_curpad); + PL_curpad = AvARRAY((AV*)AvARRAY(CvPADLIST(cv))[1]); + } + } + } + else { + PL_sortcop = Nullop; + stash = CopSTASH(PL_curcop); + } + + up = myorigmark + 1; + while (MARK < SP) { /* This may or may not shift down one here. */ + /*SUPPRESS 560*/ + if ((*up = *++MARK)) { /* Weed out nulls. */ + SvTEMP_off(*up); + if (!PL_sortcop && !SvPOK(*up)) { + STRLEN n_a; + if (SvAMAGIC(*up)) + overloading = 1; + else + (void)sv_2pv(*up, &n_a); + } + up++; + } + } + max = --up - myorigmark; + if (PL_sortcop) { + if (max > 1) { + PERL_CONTEXT *cx; + SV** newsp; + bool oldcatch = CATCH_GET; + + SAVETMPS; + SAVEOP(); + + CATCH_SET(TRUE); + PUSHSTACKi(PERLSI_SORT); + if (!hasargs && !is_xsub) { + if (PL_sortstash != stash || !PL_firstgv || !PL_secondgv) { + SAVESPTR(PL_firstgv); + SAVESPTR(PL_secondgv); + PL_firstgv = gv_fetchpv("a", TRUE, SVt_PV); + PL_secondgv = gv_fetchpv("b", TRUE, SVt_PV); + PL_sortstash = stash; + } +#ifdef USE_5005THREADS + sv_lock((SV *)PL_firstgv); + sv_lock((SV *)PL_secondgv); +#endif + SAVESPTR(GvSV(PL_firstgv)); + SAVESPTR(GvSV(PL_secondgv)); + } + + PUSHBLOCK(cx, CXt_NULL, PL_stack_base); + if (!(PL_op->op_flags & OPf_SPECIAL)) { + cx->cx_type = CXt_SUB; + cx->blk_gimme = G_SCALAR; + PUSHSUB(cx); + if (!CvDEPTH(cv)) + (void)SvREFCNT_inc(cv); /* in preparation for POPSUB */ + } + PL_sortcxix = cxstack_ix; + + if (hasargs && !is_xsub) { + /* This is mostly copied from pp_entersub */ + AV *av = (AV*)PL_curpad[0]; + +#ifndef USE_5005THREADS + cx->blk_sub.savearray = GvAV(PL_defgv); + GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av); +#endif /* USE_5005THREADS */ + cx->blk_sub.oldcurpad = PL_curpad; + cx->blk_sub.argarray = av; + } + sortsv((myorigmark+1), max, + is_xsub ? sortcv_xsub : hasargs ? sortcv_stacked : sortcv); + + POPBLOCK(cx,PL_curpm); + PL_stack_sp = newsp; + POPSTACK; + CATCH_SET(oldcatch); + } + } + else { + if (max > 1) { + MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */ + sortsv(ORIGMARK+1, max, + (PL_op->op_private & OPpSORT_NUMERIC) + ? ( (PL_op->op_private & OPpSORT_INTEGER) + ? ( overloading ? amagic_i_ncmp : sv_i_ncmp) + : ( overloading ? amagic_ncmp : sv_ncmp)) + : ( IN_LOCALE_RUNTIME + ? ( overloading + ? amagic_cmp_locale + : sv_cmp_locale_static) + : ( overloading ? amagic_cmp : sv_cmp_static))); + if (PL_op->op_private & OPpSORT_REVERSE) { + SV **p = ORIGMARK+1; + SV **q = ORIGMARK+max; + while (p < q) { + SV *tmp = *p; + *p++ = *q; + *q-- = tmp; + } + } + } + } + LEAVE; + PL_stack_sp = ORIGMARK + max; + return nextop; +} + +static I32 +sortcv(pTHX_ SV *a, SV *b) +{ + I32 oldsaveix = PL_savestack_ix; + I32 oldscopeix = PL_scopestack_ix; + I32 result; + GvSV(PL_firstgv) = a; + GvSV(PL_secondgv) = b; + PL_stack_sp = PL_stack_base; + PL_op = PL_sortcop; + CALLRUNOPS(aTHX); + if (PL_stack_sp != PL_stack_base + 1) + Perl_croak(aTHX_ "Sort subroutine didn't return single value"); + if (!SvNIOKp(*PL_stack_sp)) + Perl_croak(aTHX_ "Sort subroutine didn't return a numeric value"); + result = SvIV(*PL_stack_sp); + while (PL_scopestack_ix > oldscopeix) { + LEAVE; + } + leave_scope(oldsaveix); + return result; +} + +static I32 +sortcv_stacked(pTHX_ SV *a, SV *b) +{ + I32 oldsaveix = PL_savestack_ix; + I32 oldscopeix = PL_scopestack_ix; + I32 result; + AV *av; + +#ifdef USE_5005THREADS + av = (AV*)PL_curpad[0]; +#else + av = GvAV(PL_defgv); +#endif + + if (AvMAX(av) < 1) { + SV** ary = AvALLOC(av); + if (AvARRAY(av) != ary) { + AvMAX(av) += AvARRAY(av) - AvALLOC(av); + SvPVX(av) = (char*)ary; + } + if (AvMAX(av) < 1) { + AvMAX(av) = 1; + Renew(ary,2,SV*); + SvPVX(av) = (char*)ary; + } + } + AvFILLp(av) = 1; + + AvARRAY(av)[0] = a; + AvARRAY(av)[1] = b; + PL_stack_sp = PL_stack_base; + PL_op = PL_sortcop; + CALLRUNOPS(aTHX); + if (PL_stack_sp != PL_stack_base + 1) + Perl_croak(aTHX_ "Sort subroutine didn't return single value"); + if (!SvNIOKp(*PL_stack_sp)) + Perl_croak(aTHX_ "Sort subroutine didn't return a numeric value"); + result = SvIV(*PL_stack_sp); + while (PL_scopestack_ix > oldscopeix) { + LEAVE; + } + leave_scope(oldsaveix); + return result; +} + +static I32 +sortcv_xsub(pTHX_ SV *a, SV *b) +{ + dSP; + I32 oldsaveix = PL_savestack_ix; + I32 oldscopeix = PL_scopestack_ix; + I32 result; + CV *cv=(CV*)PL_sortcop; + + SP = PL_stack_base; + PUSHMARK(SP); + EXTEND(SP, 2); + *++SP = a; + *++SP = b; + PUTBACK; + (void)(*CvXSUB(cv))(aTHX_ cv); + if (PL_stack_sp != PL_stack_base + 1) + Perl_croak(aTHX_ "Sort subroutine didn't return single value"); + if (!SvNIOKp(*PL_stack_sp)) + Perl_croak(aTHX_ "Sort subroutine didn't return a numeric value"); + result = SvIV(*PL_stack_sp); + while (PL_scopestack_ix > oldscopeix) { + LEAVE; + } + leave_scope(oldsaveix); + return result; +} + + +static I32 +sv_ncmp(pTHX_ SV *a, SV *b) +{ + NV nv1 = SvNV(a); + NV nv2 = SvNV(b); + return nv1 < nv2 ? -1 : nv1 > nv2 ? 1 : 0; +} + +static I32 +sv_i_ncmp(pTHX_ SV *a, SV *b) +{ + IV iv1 = SvIV(a); + IV iv2 = SvIV(b); + return iv1 < iv2 ? -1 : iv1 > iv2 ? 1 : 0; +} +#define tryCALL_AMAGICbin(left,right,meth,svp) STMT_START { \ + *svp = Nullsv; \ + if (PL_amagic_generation) { \ + if (SvAMAGIC(left)||SvAMAGIC(right))\ + *svp = amagic_call(left, \ + right, \ + CAT2(meth,_amg), \ + 0); \ + } \ + } STMT_END + +static I32 +amagic_ncmp(pTHX_ register SV *a, register SV *b) +{ + SV *tmpsv; + tryCALL_AMAGICbin(a,b,ncmp,&tmpsv); + if (tmpsv) { + NV d; + + if (SvIOK(tmpsv)) { + I32 i = SvIVX(tmpsv); + if (i > 0) + return 1; + return i? -1 : 0; + } + d = SvNV(tmpsv); + if (d > 0) + return 1; + return d? -1 : 0; + } + return sv_ncmp(aTHX_ a, b); +} + +static I32 +amagic_i_ncmp(pTHX_ register SV *a, register SV *b) +{ + SV *tmpsv; + tryCALL_AMAGICbin(a,b,ncmp,&tmpsv); + if (tmpsv) { + NV d; + + if (SvIOK(tmpsv)) { + I32 i = SvIVX(tmpsv); + if (i > 0) + return 1; + return i? -1 : 0; + } + d = SvNV(tmpsv); + if (d > 0) + return 1; + return d? -1 : 0; + } + return sv_i_ncmp(aTHX_ a, b); +} + +static I32 +amagic_cmp(pTHX_ register SV *str1, register SV *str2) +{ + SV *tmpsv; + tryCALL_AMAGICbin(str1,str2,scmp,&tmpsv); + if (tmpsv) { + NV d; + + if (SvIOK(tmpsv)) { + I32 i = SvIVX(tmpsv); + if (i > 0) + return 1; + return i? -1 : 0; + } + d = SvNV(tmpsv); + if (d > 0) + return 1; + return d? -1 : 0; + } + return sv_cmp(str1, str2); +} + +static I32 +amagic_cmp_locale(pTHX_ register SV *str1, register SV *str2) +{ + SV *tmpsv; + tryCALL_AMAGICbin(str1,str2,scmp,&tmpsv); + if (tmpsv) { + NV d; + + if (SvIOK(tmpsv)) { + I32 i = SvIVX(tmpsv); + if (i > 0) + return 1; + return i? -1 : 0; + } + d = SvNV(tmpsv); + if (d > 0) + return 1; + return d? -1 : 0; + } + return sv_cmp_locale(str1, str2); +} + + -- cgit v1.2.1