diff options
Diffstat (limited to 'absl/crc/internal')
| -rw-r--r-- | absl/crc/internal/crc_internal.h | 2 | ||||
| -rw-r--r-- | absl/crc/internal/crc_x86_arm_combined.cc | 6 |
2 files changed, 8 insertions, 0 deletions
diff --git a/absl/crc/internal/crc_internal.h b/absl/crc/internal/crc_internal.h index 7a503433..0611b383 100644 --- a/absl/crc/internal/crc_internal.h +++ b/absl/crc/internal/crc_internal.h @@ -29,6 +29,8 @@ namespace crc_internal { // Prefetch constants used in some Extend() implementations constexpr int kPrefetchHorizon = ABSL_CACHELINE_SIZE * 4; // Prefetch this far +// Shorter prefetch distance for smaller buffers +constexpr int kPrefetchHorizonMedium = ABSL_CACHELINE_SIZE * 1; static_assert(kPrefetchHorizon >= 64, "CRCPrefetchHorizon less than loop len"); // We require the Scramble() function: diff --git a/absl/crc/internal/crc_x86_arm_combined.cc b/absl/crc/internal/crc_x86_arm_combined.cc index f6e6aacb..d71191e3 100644 --- a/absl/crc/internal/crc_x86_arm_combined.cc +++ b/absl/crc/internal/crc_x86_arm_combined.cc @@ -429,6 +429,12 @@ class CRC32AcceleratedX86ARMCombinedMultipleStreams ABSL_INTERNAL_STEP8BY3(l64, l641, l642, p, p1, p2); ABSL_INTERNAL_STEP8BY3(l64, l641, l642, p, p1, p2); ABSL_INTERNAL_STEP8BY3(l64, l641, l642, p, p1, p2); + base_internal::PrefetchT0( + reinterpret_cast<const char*>(p + kPrefetchHorizonMedium)); + base_internal::PrefetchT0( + reinterpret_cast<const char*>(p1 + kPrefetchHorizonMedium)); + base_internal::PrefetchT0( + reinterpret_cast<const char*>(p2 + kPrefetchHorizonMedium)); } // Don't run crc on last 8 bytes. ABSL_INTERNAL_STEP8BY3(l64, l641, l642, p, p1, p2); |