diff options
| author | Brotli <no-reply@google.com> | 2024-04-18 19:59:28 -0700 |
|---|---|---|
| committer | Copybara-Service <copybara-worker@google.com> | 2024-04-18 20:00:02 -0700 |
| commit | 1b3a5ccb6e7b9384b741437532f4dae0730c61f2 (patch) | |
| tree | 4fe4f6271a54307c9dce11b40d5ed9e71e37dda6 /c/common/platform.h | |
| parent | 443af10a8001c5de7bab306d329de614c3defebc (diff) | |
| download | brotli-1b3a5ccb6e7b9384b741437532f4dae0730c61f2.zip brotli-1b3a5ccb6e7b9384b741437532f4dae0730c61f2.tar.gz brotli-1b3a5ccb6e7b9384b741437532f4dae0730c61f2.tar.bz2 | |
Prefetch the backreference hashtable bucket.
Place the prefetch before the last distance checks, to give the prefetch enough time to work.
PiperOrigin-RevId: 626228820
Diffstat (limited to 'c/common/platform.h')
| -rw-r--r-- | c/common/platform.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/c/common/platform.h b/c/common/platform.h index dbba942..c18ff02 100644 --- a/c/common/platform.h +++ b/c/common/platform.h @@ -519,6 +519,21 @@ BROTLI_UNUSED_FUNCTION void BrotliSuppressUnusedFunctions(void) { #if BROTLI_ENABLE_DUMP BROTLI_UNUSED(&BrotliDump); #endif + +#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) && !defined(_M_ARM64EC) /* _mm_prefetch() is not defined outside of x86/x64 */ +# include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */ +# define PREFETCH_L1(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0) +# define PREFETCH_L2(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1) +#elif BROTLI_GNUC_HAS_BUILTIN(__builtin_prefetch, 3, 1, 0) +# define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */) +# define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */) +#elif defined(__aarch64__) +# define PREFETCH_L1(ptr) do { __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr))); } while (0) +# define PREFETCH_L2(ptr) do { __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr))); } while (0) +#else +# define PREFETCH_L1(ptr) do { (void)(ptr); } while (0) /* disabled */ +# define PREFETCH_L2(ptr) do { (void)(ptr); } while (0) /* disabled */ +#endif } #endif /* BROTLI_COMMON_PLATFORM_H_ */ |