diff options
| author | Nathan Moinvaziri <nathan@nathanm.com> | 2020-02-25 14:36:56 -0800 |
|---|---|---|
| committer | Hans Kristian Rosbach <hk-github@circlestorm.org> | 2020-05-24 13:53:25 +0200 |
| commit | 9bd28d93813db93aa2fb1b14309cced1efe7d721 (patch) | |
| tree | a1185fadcd53a5b8fe36e23ff748b7b118683dcb /functable.c | |
| parent | 641491adedec68079d728728a1e9b2c76c2fae1d (diff) | |
Abstracted out architecture specific implementations of 258 byte comparison to compare258.
Diffstat (limited to 'functable.c')
| -rw-r--r-- | functable.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/functable.c b/functable.c index ca9b82f..943c2b4 100644 --- a/functable.c +++ b/functable.c @@ -9,6 +9,11 @@ #include "deflate_p.h" #include "functable.h" + +#ifdef X86_CPUID +# include "fallback_builtins.h" +#endif + /* insert_string */ extern Pos insert_string_c(deflate_state *const s, const Pos str, unsigned int count); #ifdef X86_SSE42_CRC_HASH @@ -58,6 +63,16 @@ extern uint32_t crc32_little(uint32_t, const unsigned char *, uint64_t); extern uint32_t crc32_big(uint32_t, const unsigned char *, uint64_t); #endif +/* compare258 */ +extern int32_t compare258_c(const unsigned char *src0, const unsigned char *src1); +#ifdef UNALIGNED_OK +extern int32_t compare258_unaligned_16(const unsigned char *src0, const unsigned char *src1); +extern int32_t compare258_unaligned_32(const unsigned char *src0, const unsigned char *src1); +extern int32_t compare258_unaligned_64(const unsigned char *src0, const unsigned char *src1); +#ifdef X86_SSE42_CMP_STR +extern int32_t compare258_unaligned_sse4(const unsigned char *src0, const unsigned char *src1); +#endif +#endif /* stub definitions */ ZLIB_INTERNAL Pos insert_string_stub(deflate_state *const s, const Pos str, unsigned int count); @@ -65,6 +80,7 @@ ZLIB_INTERNAL Pos quick_insert_string_stub(deflate_state *const s, const Pos str ZLIB_INTERNAL uint32_t adler32_stub(uint32_t adler, const unsigned char *buf, size_t len); ZLIB_INTERNAL uint32_t crc32_stub(uint32_t crc, const unsigned char *buf, uint64_t len); ZLIB_INTERNAL void slide_hash_stub(deflate_state *s); +ZLIB_INTERNAL int32_t compare258_stub(const unsigned char *src0, const unsigned char *src1); /* functable init */ ZLIB_INTERNAL __thread struct functable_s functable = { @@ -72,7 +88,8 @@ ZLIB_INTERNAL __thread struct functable_s functable = { quick_insert_string_stub, adler32_stub, crc32_stub, - slide_hash_stub + slide_hash_stub, + compare258_stub }; ZLIB_INTERNAL void cpu_check_features(void) @@ -189,3 +206,25 @@ ZLIB_INTERNAL uint32_t crc32_stub(uint32_t crc, const unsigned char *buf, uint64 return functable.crc32(crc, buf, len); } + +ZLIB_INTERNAL int32_t compare258_stub(const unsigned char *src0, const unsigned char *src1) { + + functable.compare258 = &compare258_c; + +#ifdef UNALIGNED_OK +# ifdef HAVE_BUILTIN_CTZLL + functable.compare258 = &compare258_unaligned_64; +# elif defined(HAVE_BUILTIN_CTZ) + functable.compare258 = &compare258_unaligned_32; +# else + functable.compare258 = &compare258_unaligned_16; +# endif +# ifdef X86_SSE42_CMP_STR + if (x86_cpu_has_sse42) + functable.compare258 = &compare258_unaligned_sse4; +# endif +#endif + + return functable.compare258(src0, src1); +} + |