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Improved RISC-V code

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This commit is contained in:
SChernykh
2026-01-15 12:48:55 +01:00
parent 1bd59129c4
commit e41b28ef78
3 changed files with 20 additions and 74 deletions
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48
src/crypto/randomx/jit_compiler_rv64_vector.cpp
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@@ -360,44 +360,6 @@ void* generateProgramVectorRV64(uint8_t* buf, Program& prog, ProgramConfiguratio
uint8_t* last_modified[RegistersCount] = { p, p, p, p, p, p, p, p };
uint8_t readReg01[RegistersCount] = {};
readReg01[pcfg.readReg0] = 1;
readReg01[pcfg.readReg1] = 1;
uint32_t scratchpad_prefetch_pos = 0;
for (int32_t i = static_cast<int32_t>(prog.getSize()) - 1; i >= 0; --i) {
Instruction instr = prog(i);
const InstructionType inst_type = static_cast<InstructionType>(inst_map[instr.opcode]);
if (inst_type == InstructionType::CBRANCH) {
scratchpad_prefetch_pos = i;
break;
}
if (inst_type < InstructionType::FSWAP_R) {
const uint32_t src = instr.src % RegistersCount;
const uint32_t dst = instr.dst % RegistersCount;
if ((inst_type == InstructionType::ISWAP_R) && (src != dst) && (readReg01[src] || readReg01[dst])) {
scratchpad_prefetch_pos = i;
break;
}
if ((inst_type == InstructionType::IMUL_RCP) && readReg01[dst] && !isZeroOrPowerOf2(instr.getImm32())) {
scratchpad_prefetch_pos = i;
break;
}
if (readReg01[dst]) {
scratchpad_prefetch_pos = i;
break;
}
}
}
for (uint32_t i = 0, n = prog.getSize(); i < n; ++i) {
Instruction instr = prog(i);
@@ -854,16 +816,6 @@ void* generateProgramVectorRV64(uint8_t* buf, Program& prog, ProgramConfiguratio
default:
UNREACHABLE;
}
// Prefetch scratchpad lines for the next main loop iteration
// scratchpad_prefetch_pos is a conservative estimate of the earliest place in the code where we can do it
if (i == scratchpad_prefetch_pos) {
uint8_t* e = (uint8_t*)(buf + DIST(randomx_riscv64_vector_code_begin, randomx_riscv64_vector_program_scratchpad_prefetch_end));
const size_t n = e - ((uint8_t*)spaddr_xor2);
memcpy(p, spaddr_xor2, n);
p += n;
}
}
const uint8_t* e;