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Tuned JIT compiler

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0.3-0.4% speedup depending on CPU.
This commit is contained in:
SChernykh 2020-02-20 20:59:22 +01:00
parent 887c891ab2
commit 0caeb41bff
6 changed files with 61 additions and 15 deletions
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46
src/crypto/randomx/jit_compiler_x86.cpp
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@ -325,6 +325,13 @@ namespace randomx {
freePagedMemory(allocatedCode, CodeSize);
}
void JitCompilerX86::prepare() {
for (int i = 0; i < sizeof(engine); i += 64)
rx_prefetch_nta((const char*)(&engine) + i);
for (int i = 0; i < sizeof(RandomX_CurrentConfig); i += 64)
rx_prefetch_nta((const char*)(&RandomX_CurrentConfig) + i);
}
void JitCompilerX86::generateProgram(Program& prog, ProgramConfiguration& pcfg, uint32_t flags) {
vm_flags = flags;
@ -419,11 +426,29 @@ namespace randomx {
r[j] = k;
}
for (int i = 0, n = static_cast<int>(RandomX_CurrentConfig.ProgramSize); i < n; ++i) {
Instruction& instr = prog(i);
const uint8_t opcode = instr.opcode;
*((uint64_t*)&instr) &= (uint64_t(-1) - (0xFFFF << 8)) | ((RegistersCount - 1) << 8) | ((RegistersCount - 1) << 16);
(this->*(engine[opcode]))(instr);
constexpr uint64_t instr_mask = (uint64_t(-1) - (0xFFFF << 8)) | ((RegistersCount - 1) << 8) | ((RegistersCount - 1) << 16);
for (int i = 0, n = static_cast<int>(RandomX_CurrentConfig.ProgramSize); i < n; i += 4) {
Instruction& instr1 = prog(i);
Instruction& instr2 = prog(i + 1);
Instruction& instr3 = prog(i + 2);
Instruction& instr4 = prog(i + 3);
InstructionGeneratorX86 gen1 = engine[instr1.opcode];
InstructionGeneratorX86 gen2 = engine[instr2.opcode];
InstructionGeneratorX86 gen3 = engine[instr3.opcode];
InstructionGeneratorX86 gen4 = engine[instr4.opcode];
*((uint64_t*)&instr1) &= instr_mask;
(this->*gen1)(instr1);
*((uint64_t*)&instr2) &= instr_mask;
(this->*gen2)(instr2);
*((uint64_t*)&instr3) &= instr_mask;
(this->*gen3)(instr3);
*((uint64_t*)&instr4) &= instr_mask;
(this->*gen4)(instr4);
}
emit(REX_MOV_RR, code, codePos);
@ -609,13 +634,14 @@ namespace randomx {
int pos = codePos;
uint8_t* const p = code + pos;
const uint32_t sib = (instr.getModShift() << 6) | (instr.src << 3) | instr.dst;
*(uint32_t*)(p) = template_IADD_RS[instr.dst] | (sib << 24);
const uint32_t dst = instr.dst;
const uint32_t sib = (instr.getModShift() << 6) | (instr.src << 3) | dst;
*(uint32_t*)(p) = template_IADD_RS[dst] | (sib << 24);
*(uint32_t*)(p + 4) = instr.getImm32();
pos += ((instr.dst == RegisterNeedsDisplacement) ? 8 : 4);
pos += ((dst == RegisterNeedsDisplacement) ? 8 : 4);
registerUsage[instr.dst] = pos;
registerUsage[dst] = pos;
codePos = pos;
}
@ -1152,6 +1178,6 @@ namespace randomx {
emit(NOP1, code, codePos);
}
InstructionGeneratorX86 JitCompilerX86::engine[256] = {};
alignas(64) InstructionGeneratorX86 JitCompilerX86::engine[256] = {};
}