faster decoding speed with Visual

by enabling the fast decoder path.
Visual requires a different set of macro constants to detect x86 / x64.

On my laptop, decoding speed on x64 went up from 3.12 to 3.45 GB/s.
32-bit is less impressive, though still favorable,
with speed increasing from 2.55 to 2.60 GB/s.

So both cases are now enabled.

Suggested by Bartosz Taudul (@wolfpld).

diff --git a/.gitignore b/.gitignore
index 2a59a7d..d7ba96e 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,9 @@ _codelite_lz4/
 bin/
 *.zip
 
+# analyzers
+infer-out
+
 # Mac
 .DS_Store
 *.dSYM

diff --git a/lib/lz4.c b/lib/lz4.c
index 85c3322..866855b 100644 (file)
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -374,12 +374,12 @@ static const int      dec64table[8] = {0, 0, 0, -1, -4,  1, 2, 3};
 
 
 #ifndef LZ4_FAST_DEC_LOOP
-#  if defined(__i386__) || defined(__x86_64__)
+#  if defined __i386__ || defined _M_IX86 || defined __x86_64__ || defined _M_X64
 #    define LZ4_FAST_DEC_LOOP 1
 #  elif defined(__aarch64__) && !defined(__clang__)
      /* On aarch64, we disable this optimization for clang because on certain
-      * mobile chipsets and clang, it reduces performance. For more information
-      * refer to https://github.com/lz4/lz4/pull/707. */
+      * mobile chipsets, performance is reduced with clang. For information
+      * refer to https://github.com/lz4/lz4/pull/707 */
 #    define LZ4_FAST_DEC_LOOP 1
 #  else
 #    define LZ4_FAST_DEC_LOOP 0