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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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26
src/crypto/randomx/jit_compiler_x86_static.asm
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@ -28,7 +28,10 @@ IFDEF RAX
_RANDOMX_JITX86_STATIC SEGMENT PAGE READ EXECUTE
PUBLIC randomx_prefetch_scratchpad
PUBLIC randomx_prefetch_scratchpad_end
PUBLIC randomx_program_prologue
PUBLIC randomx_program_prologue_first_load
PUBLIC randomx_program_loop_begin
PUBLIC randomx_program_loop_load
PUBLIC randomx_program_start
@ -50,15 +53,36 @@ RANDOMX_SCRATCHPAD_MASK EQU 2097088
RANDOMX_DATASET_BASE_MASK EQU 2147483584
RANDOMX_CACHE_MASK EQU 4194303
randomx_prefetch_scratchpad PROC
mov rdx, rax
and eax, RANDOMX_SCRATCHPAD_MASK
prefetcht0 [rsi+rax]
ror rdx, 32
and edx, RANDOMX_SCRATCHPAD_MASK
prefetcht0 [rsi+rdx]
randomx_prefetch_scratchpad ENDP
randomx_prefetch_scratchpad_end PROC
randomx_prefetch_scratchpad_end ENDP
ALIGN 64
randomx_program_prologue PROC
include asm/program_prologue_win64.inc
movapd xmm13, xmmword ptr [mantissaMask]
movapd xmm14, xmmword ptr [exp240]
movapd xmm15, xmmword ptr [scaleMask]
jmp randomx_program_loop_begin
randomx_program_prologue ENDP
randomx_program_prologue_first_load PROC
xor rax, r8
xor rax, r8
mov rdx, rax
and eax, RANDOMX_SCRATCHPAD_MASK
ror rdx, 32
and edx, RANDOMX_SCRATCHPAD_MASK
jmp randomx_program_loop_begin
randomx_program_prologue_first_load ENDP
ALIGN 64
include asm/program_xmm_constants.inc