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Improve adaptive_merge: reduce ranges before merging and optimize buffer usage.

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This commit is contained in:
Ion Gaztañaga
2018-12-31 01:01:06 +01:00
parent 580ec87d09
commit aa04994c5b
1 changed files with 34 additions and 25 deletions
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59
include/boost/move/algo/adaptive_merge.hpp
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@@ -107,32 +107,15 @@ inline void adaptive_merge_final_merge( RandIt first
{
typedef typename iterator_traits<RandIt>::size_type size_type;
(void)l_block;
(void)use_internal_buf;
size_type n_keys = collected-l_intbuf;
size_type len = len1+len2;
if(use_internal_buf){
if(xbuf_used){
xbuf.clear();
//Nothing to do
if(n_keys){
unstable_sort(first, first+n_keys, comp, xbuf);
stable_merge(first, first+n_keys, first+len, comp, xbuf);
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L2(" A key mrg: ", len);
}
}
else{
xbuf.clear();
unstable_sort(first, first+collected, comp, xbuf);
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L2(" A k/b srt: ", len);
stable_merge(first, first+collected, first+len, comp, xbuf);
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L2(" A k/b mrg: ", len);
}
}
else{
if (!xbuf_used || n_keys) {
xbuf.clear();
unstable_sort(first, first+collected, comp, xbuf);
const size_type middle = xbuf_used && n_keys ? n_keys: collected;
unstable_sort(first, first + middle, comp, xbuf);
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L2(" A k/b srt: ", len);
stable_merge(first, first+collected, first+len1+len2, comp, xbuf);
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L2(" A k/b mrg: ", len);
stable_merge(first, first + middle, first + len, comp, xbuf);
}
BOOST_MOVE_ADAPTIVE_SORT_PRINT_L1(" A fin mrg: ", len);
}
@@ -168,8 +151,8 @@ inline SizeType adaptive_merge_n_keys_intbuf(SizeType &rl_block, SizeType len1,
size_type l_block = rl_block;
size_type l_intbuf = xbuf.capacity() >= l_block ? 0u : l_block;
while(xbuf.capacity() >= l_block*2){
l_block *= 2;
if (xbuf.capacity() > l_block){
l_block = xbuf.capacity();
}
//This is the minimum number of keys to implement the ideal algorithm
@@ -331,7 +314,33 @@ void adaptive_merge( RandIt first, RandIt middle, RandIt last, Compare comp
typedef typename iterator_traits<RandIt>::size_type size_type;
typedef typename iterator_traits<RandIt>::value_type value_type;
::boost::movelib::detail_adaptive::adaptive_xbuf<value_type> xbuf(uninitialized, uninitialized_len);
if (first == middle || middle == last){
return;
}
//Reduce ranges to merge if possible
do {
if (comp(*middle, *first)){
break;
}
++first;
if (first == middle)
return;
} while(1);
RandIt first_high(middle);
--first_high;
do {
--last;
if (comp(*last, *first_high)){
++last;
break;
}
if (last == middle)
return;
} while(1);
::boost::movelib::adaptive_xbuf<value_type> xbuf(uninitialized, uninitialized_len);
::boost::movelib::detail_adaptive::adaptive_merge_impl(first, size_type(middle - first), size_type(last - middle), comp, xbuf);
}