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Added : lz4demo : software swap32 backend for compilers which do not support hardware ones. Thanks Dmitry Cherepanov for contribution

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git-svn-id: https://lz4.googlecode.com/svn/trunk@60 650e7d94-2a16-8b24-b05c-7c0b3f6821cd
This commit is contained in:
yann.collet.73@gmail.com 2012-03-16 19:50:58 +00:00
parent ad59ba1cfa
commit fd281f8e5d
3 changed files with 13 additions and 4 deletions
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2
Makefile
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@ -14,7 +14,7 @@ lz4demo64: lz4.c lz4.h bench.c lz4demo.c
gcc -O3 -I. -std=c99 -Wall -W -Wundef -Wno-implicit-function-declaration lz4.c bench.c lz4demo.c -o $(OUTPUT64)
lz4demo32: lz4.c lz4.h bench.c lz4demo.c
gcc -m32 -O3 -I. -std=c99 -Wall -W -Wundef -Wno-implicit-function-declaration lz4.c bench.c lz4demo.c -o $(OUTPUT32)
gcc -m32 -Os -march=native -I. -std=c99 -Wall -W -Wundef -Wno-implicit-function-declaration lz4.c bench.c lz4demo.c -o $(OUTPUT32)
clean:
rm -f core *.o $(OUTPUT32) $(OUTPUT64)

4
lz4.c
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@ -215,10 +215,10 @@ typedef struct _U64_S { U64 v; } U64_S;
#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
#define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = bswap16(v); d = (s) - v; }
#define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = bswap16(v); A16(p) = v; p+=2; }
#define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = bswap16(v); A16(p) = v; p+=2; }
#else // Little Endian
#define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
#define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
#define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
#endif

11
lz4demo.c
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@ -45,10 +45,19 @@
//**************************************
// Compiler functions
//**************************************
#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
#if defined(_MSC_VER) // Visual Studio
#define swap32 _byteswap_ulong
#else // GCC assumed
#elif GCC_VERSION >= 402
#define swap32 __builtin_bswap32
#else
static inline unsigned int swap32(unsigned int x) {
return ((x << 24) & 0xff000000 ) |
((x << 8) & 0x00ff0000 ) |
((x >> 8) & 0x0000ff00 ) |
((x >> 24) & 0x000000ff );
}
#endif