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Fixed initial dataset prefetch for RandomX v2

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This commit is contained in:
SChernykh
2026-02-15 21:18:52 +01:00
parent 17aa97e543
commit 976a08efb4
4 changed files with 16 additions and 12 deletions
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6
src/crypto/randomx/asm/program_prologue_linux.inc
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@@ -13,12 +13,6 @@
mov rbp, qword ptr [rsi] ;# "mx", "ma" mov rbp, qword ptr [rsi] ;# "mx", "ma"
mov rdi, qword ptr [rsi+8] ;# uint8_t* dataset mov rdi, qword ptr [rsi+8] ;# uint8_t* dataset
;# dataset prefetch for the first iteration of the main loop
mov rax, rbp
shr rax, 32
and eax, RANDOMX_DATASET_BASE_MASK
prefetchnta byte ptr [rdi+rax]
mov rsi, rdx ;# uint8_t* scratchpad mov rsi, rdx ;# uint8_t* scratchpad
mov rax, rbp mov rax, rbp

6
src/crypto/randomx/asm/program_prologue_win64.inc
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@@ -25,12 +25,6 @@
mov rbp, qword ptr [rdx] ;# "mx", "ma" mov rbp, qword ptr [rdx] ;# "mx", "ma"
mov rdi, qword ptr [rdx+8] ;# uint8_t* dataset mov rdi, qword ptr [rdx+8] ;# uint8_t* dataset
;# dataset prefetch for the first iteration of the main loop
mov rax, rbp
shr rax, 32
and eax, RANDOMX_DATASET_BASE_MASK
prefetchnta byte ptr [rdi+rax]
mov rsi, r8 ;# uint8_t* scratchpad mov rsi, r8 ;# uint8_t* scratchpad
mov rbx, r9 ;# loop counter mov rbx, r9 ;# loop counter

5
src/crypto/randomx/intrin_portable.h
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@@ -577,8 +577,13 @@ inline void* rx_aligned_alloc(size_t size, size_t align) {
# define rx_aligned_free(a) free(a) # define rx_aligned_free(a) free(a)
#endif #endif
#ifdef __GNUC__
#define rx_prefetch_nta(x) __builtin_prefetch((x), 0, 0)
#define rx_prefetch_t0(x) __builtin_prefetch((x), 0, 3)
#else
#define rx_prefetch_nta(x) #define rx_prefetch_nta(x)
#define rx_prefetch_t0(x) #define rx_prefetch_t0(x)
#endif
FORCE_INLINE rx_vec_f128 rx_load_vec_f128(const double* pd) { FORCE_INLINE rx_vec_f128 rx_load_vec_f128(const double* pd) {
rx_vec_f128 x; rx_vec_f128 x;

11
src/crypto/randomx/vm_compiled.cpp
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@@ -61,6 +61,17 @@ namespace randomx {
# if defined(XMRIG_ARM) || defined(XMRIG_RISCV) # if defined(XMRIG_ARM) || defined(XMRIG_RISCV)
memcpy(reg.f, config.eMask, sizeof(config.eMask)); memcpy(reg.f, config.eMask, sizeof(config.eMask));
# endif # endif
const uint8_t* p = mem.memory;
// dataset prefetch for the first iteration of the main loop
rx_prefetch_nta(p + (mem.ma & (RandomX_ConfigurationBase::DatasetBaseSize - 64)));
// dataset prefetch for the second iteration of the main loop (RandomX v2)
if (RandomX_CurrentConfig.Tweak_V2_PREFETCH) {
rx_prefetch_nta(p + (mem.mx & (RandomX_ConfigurationBase::DatasetBaseSize - 64)));
}
compiler.getProgramFunc()(reg, mem, scratchpad, RandomX_CurrentConfig.ProgramIterations); compiler.getProgramFunc()(reg, mem, scratchpad, RandomX_CurrentConfig.ProgramIterations);
} }