lz4.c : changed a tuning parameter name to MEMORY_USAGE, to better reflect its impact
Makefile : default produces native binary, all produce native & 32-bits binaries
git-svn-id: https://lz4.googlecode.com/svn/trunk@70 650e7d94-2a16-8b24-b05c-7c0b3f6821cd
diff --git a/Makefile b/Makefile
index 5b87bb6..dbefc12 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,9 @@
OUTPUT = LZ4Demo.exe
endif
-all: lz4demo
+default: lz4demo
+
+all: lz4demo lz4demo32
lz4demo: lz4.c lz4.h lz4hc.c lz4hc.h bench.c lz4demo.c
gcc -O3 -I. -std=c99 -Wall -W -Wundef -Wno-implicit-function-declaration lz4hc.c lz4.c bench.c lz4demo.c -o $(OUTPUT)
diff --git a/lz4.c b/lz4.c
index 06e2829..b2156cb 100644
--- a/lz4.c
+++ b/lz4.c
@@ -34,12 +34,12 @@
//**************************************
// Tuning parameters
//**************************************
-// COMPRESSIONLEVEL :
-// Increasing this value improves compression ratio
-// Lowering this value reduces memory usage
-// Reduced memory usage typically improves speed, due to cache effect (ex : L1 32KB for Intel, L1 64KB for AMD)
-// Memory usage formula : N->2^(N+2) Bytes (examples : 12 -> 16KB ; 17 -> 512KB)
-#define COMPRESSIONLEVEL 12
+// MEMORY_USAGE :
+// Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
+// Increasing memory usage improves compression ratio
+// Reduced memory usage can improve speed, due to cache effect
+// Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
+#define MEMORY_USAGE 14
// NOTCOMPRESSIBLE_CONFIRMATION :
// Decreasing this value will make the algorithm skip faster data segments considered "incompressible"
@@ -57,8 +57,8 @@
#define LZ4_COMPRESSMIN 0
// BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE :
-// This will provide a boost to performance for big endian cpu, but the resulting compressed stream will be incompatible with little-endian CPU.
-// You can set this option to 1 in situations where data will stay within closed environment
+// This will provide a small boost to performance for big endian cpu, but the resulting compressed stream will be incompatible with little-endian CPU.
+// You can set this option to 1 in situations where data will remain within closed environment
// This option is useless on Little_Endian CPU (such as x86)
//#define BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE 1
@@ -181,7 +181,7 @@
//**************************************
#define MINMATCH 4
-#define HASH_LOG COMPRESSIONLEVEL
+#define HASH_LOG (MEMORY_USAGE-2)
#define HASHTABLESIZE (1 << HASH_LOG)
#define HASH_MASK (HASHTABLESIZE - 1)
