gzip: flush output buffer after stored blocks only if necessary

function                                             old     new   delta
flush_block                                          671     680      +9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/archival/gzip.c b/archival/gzip.c
index 7df38c2bcd61d72626994635358f204a2c36289e..92130e7fb9baed178a47bf0ab33e50092f550cd0 100644 (file)
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -634,7 +634,8 @@ static void copy_block(char *buf, unsigned len, int header)
                put_8bit(*buf++);
        }
        /* The above can 32-bit misalign outbuf */
-       flush_outbuf_if_32bit_optimized();
+       if (G1.outcnt & 3) /* syscalls are expensive, is it really misaligned? */
+               flush_outbuf_if_32bit_optimized();
 }