nigeltao

diff --git a/snappy_unittest.cc b/snappy_unittest.cc
index fcb3261..dc473a3 100644
--- a/snappy_unittest.cc
+++ b/snappy_unittest.cc
@@ -47,11 +47,11 @@ DEFINE_int32(end_len, -1,
 DEFINE_int32(bytes, 10485760,
              "How many bytes to compress/uncompress per file for timing");
 
-DEFINE_bool(zlib, false,
+DEFINE_bool(zlib, true,

nigeltao

Speed up inflate_fast by up to 1.5x on x86_64.

https://github.com/google/snappy is an unrelated compression format but
its snappy_unittest program is able to benchmark the snappy library and
the zlib library. We can re-purpose it, via LD_LIBRARY_PATH, to measure
different versions of zlib, such as before / after this commit.

snappy_unittest's output looks like:

testdata/alice29.txt                     :

nigeltao

--- inffast.c	2017-08-25 12:05:02.309161736 +1000
+++ contrib/inffast64/inffast64.c	2017-08-25 12:09:05.504252162 +1000
@@ -11,8 +11,11 @@
 #ifdef ASMINF
 #  pragma message("Assembler code may have bugs -- use at your own risk")
 #elif INFLATE_FAST64
-/* Skip this implementation; use contrib/inffast64/inffast64.c instead. */
-#else
+
+#if defined(ZLIB_INTERNAL_HAVE_64_BIT_UNALIGNED_LOADS) || \