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| author | singler <singler@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-08 09:11:49 +0000 |
|---|---|---|
| committer | singler <singler@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-08 09:11:49 +0000 |
| commit | 84098e25fabc160c0178602082dcfbe547f5bc8d (patch) | |
| tree | 9129229778941484eeb985061e9bde666e88d58c /libstdc++-v3/include/parallel | |
| parent | ba72912a012b97cad825eebee3f5f22253d0afe4 (diff) | |
| download | ppe42-gcc-84098e25fabc160c0178602082dcfbe547f5bc8d.tar.gz ppe42-gcc-84098e25fabc160c0178602082dcfbe547f5bc8d.zip | |
2010-06-08 Johannes Singler <singler@kit.edu>
* include/parallel/partial_sum.h
(__parallel_partial_sum_linear):
Correctly calculate part lengths for partial_sum_dilation!=1.0f.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@160428 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libstdc++-v3/include/parallel')
| -rw-r--r-- | libstdc++-v3/include/parallel/partial_sum.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libstdc++-v3/include/parallel/partial_sum.h b/libstdc++-v3/include/parallel/partial_sum.h index 966d9db0572..d398c4585a2 100644 --- a/libstdc++-v3/include/parallel/partial_sum.h +++ b/libstdc++-v3/include/parallel/partial_sum.h @@ -127,10 +127,13 @@ namespace __gnu_parallel equally_split(__n, __num_threads + 1, __borders); else { + _DifferenceType __first_part_length = + std::max<_DifferenceType>(1, + __n / (1.0f + __s.partial_sum_dilation * __num_threads)); _DifferenceType __chunk_length = - ((double)__n - / ((double)__num_threads + __s.partial_sum_dilation)), - __borderstart = __n - __num_threads * __chunk_length; + (__n - __first_part_length) / __num_threads; + _DifferenceType __borderstart = + __n - __num_threads * __chunk_length; __borders[0] = 0; for (_ThreadIndex __i = 1; __i < (__num_threads + 1); ++__i) { |
