diff options
author | Eli Zaretskii <eliz@gnu.org> | 2012-02-01 18:51:20 +0200 |
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committer | Eli Zaretskii <eliz@gnu.org> | 2012-02-01 18:51:20 +0200 |
commit | 78cef8778985b15bcb16a9ed9604395b3ab6b9c3 (patch) | |
tree | 80aa81f20bb03a441d288052a311a423f7f5391e /src/ralloc.c | |
parent | 90586172568f5a4e5d4b62f59deb1dfb69e8b4f5 (diff) | |
download | emacs-78cef8778985b15bcb16a9ed9604395b3ab6b9c3.tar.gz |
Speed up insertion of subprocess output on MS-Windows.
src/ralloc.c (resize_bloc, r_alloc_sbrk): Don't call memmove if its
first 2 arguments are identical. This makes inserting large
output from a subprocess an order of magnitude faster on
MS-Windows, where all sbrk'ed memory is always contiguous.
Diffstat (limited to 'src/ralloc.c')
-rw-r--r-- | src/ralloc.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/ralloc.c b/src/ralloc.c index 13587b9ffd4..896ad9f3155 100644 --- a/src/ralloc.c +++ b/src/ralloc.c @@ -636,7 +636,8 @@ resize_bloc (bloc_ptr bloc, SIZE size) } else { - memmove (b->new_data, b->data, b->size); + if (b->new_data != b->data) + memmove (b->new_data, b->data, b->size); *b->variable = b->data = b->new_data; } } @@ -647,7 +648,8 @@ resize_bloc (bloc_ptr bloc, SIZE size) } else { - memmove (bloc->new_data, bloc->data, old_size); + if (bloc->new_data != bloc->data) + memmove (bloc->new_data, bloc->data, old_size); memset ((char *) bloc->new_data + old_size, 0, size - old_size); *bloc->variable = bloc->data = bloc->new_data; } @@ -663,7 +665,8 @@ resize_bloc (bloc_ptr bloc, SIZE size) } else { - memmove (b->new_data, b->data, b->size); + if (b->new_data != b->data) + memmove (b->new_data, b->data, b->size); *b->variable = b->data = b->new_data; } } @@ -816,7 +819,8 @@ r_alloc_sbrk (long int size) header. */ for (b = last_bloc; b != NIL_BLOC; b = b->prev) { - memmove (b->new_data, b->data, b->size); + if (b->new_data != b->data) + memmove (b->new_data, b->data, b->size); *b->variable = b->data = b->new_data; } @@ -862,7 +866,8 @@ r_alloc_sbrk (long int size) for (b = first_bloc; b != NIL_BLOC; b = b->next) { - memmove (b->new_data, b->data, b->size); + if (b->new_data != b->data) + memmove (b->new_data, b->data, b->size); *b->variable = b->data = b->new_data; } } |