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RandomX: optimized loading from scratchpad

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Prefetches scratchpad data as soon as possible to calculate data address for the next load.

Up to ~1.4% speedup on Ryzen 7 3700X @ 4.1 GHz, RAM 3200 MHz 14-14-14-28 with optimized sub-timings:
Variant|Before H/S|After H/S
-------|----------|---------
rx/0|8663|8777
rx/wow|9867|10009
rx/loki|8652|8731
This commit is contained in:
SChernykh 2019-09-11 19:10:01 +02:00
parent 01b2c952ea
commit 2322e3bcf7
9 changed files with 75 additions and 21 deletions
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10
src/crypto/randomx/randomx.cpp
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@ -149,9 +149,9 @@ RandomX_ConfigurationBase::RandomX_ConfigurationBase()
memcpy(codeReadDatasetLightSshInitTweaked, a, b - a);
}
{
const uint8_t* a = (const uint8_t*)&randomx_program_loop_load;
const uint8_t* b = (const uint8_t*)&randomx_program_start;
memcpy(codeLoopLoadTweaked, a, b - a);
const uint8_t* a = (const uint8_t*)&randomx_prefetch_scratchpad;
const uint8_t* b = (const uint8_t*)&randomx_prefetch_scratchpad_end;
memcpy(codePrefetchScratchpadTweaked, a, b - a);
}
#endif
}
@ -177,8 +177,8 @@ void RandomX_ConfigurationBase::Apply()
ScratchpadL3Mask64_Calculated = ((ScratchpadL3_Size / sizeof(uint64_t)) / 8 - 1) * 64;
#if defined(_M_X64) || defined(__x86_64__)
*(uint32_t*)(codeLoopLoadTweaked + 4) = ScratchpadL3Mask64_Calculated;
*(uint32_t*)(codeLoopLoadTweaked + 50) = ScratchpadL3Mask64_Calculated;
*(uint32_t*)(codePrefetchScratchpadTweaked + 4) = ScratchpadL3Mask64_Calculated;
*(uint32_t*)(codePrefetchScratchpadTweaked + 18) = ScratchpadL3Mask64_Calculated;
#endif
ConditionMask_Calculated = (1 << JumpBits) - 1;