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Group E exponent changed from a static value (-240) to dynamic

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This commit is contained in:
tevador 2019-04-30 21:14:50 +02:00
parent be21ba767c
commit ca96270509
8 changed files with 56 additions and 46 deletions
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4
src/asm/program_xmm_constants.inc
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@ -1,6 +1,6 @@
mantissaMask:
db 255, 255, 255, 255, 255, 255, 15, 0, 255, 255, 255, 255, 255, 255, 15, 0
db 255, 255, 255, 255, 255, 255, 255, 0, 255, 255, 255, 255, 255, 255, 255, 0
exp240:
db 0, 0, 0, 0, 0, 0, 240, 48, 0, 0, 0, 0, 0, 0, 240, 48
db 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
scaleMask:
db 0, 0, 0, 0, 0, 0, 240, 129, 0, 0, 0, 0, 0, 0, 240, 129

13
src/assembly_generator_x86.cpp
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@ -35,9 +35,9 @@ namespace randomx {
static const char* regA[] = { "xmm8", "xmm9", "xmm10", "xmm11" };
static const char* tempRegx = "xmm12";
static const char* mantissaMask = "xmm13";
static const char* exponentMask = "xmm14";
static const char* scaleMask = "xmm15";
static const char* mantissaMaskReg = "xmm13";
static const char* exponentMaskReg = "xmm14";
static const char* scaleMaskReg = "xmm15";
static const char* regIc = "rbx";
static const char* regIc32 = "ebx";
static const char* regIc8 = "bl";
@ -328,7 +328,6 @@ namespace randomx {
traceint(instr);
}
//4 uOPs
void AssemblyGeneratorX86::h_IMULH_R(Instruction& instr, int i) {
registerUsage[instr.dst].lastUsed = i;
asmCode << "\tmov rax, " << regR[instr.dst] << std::endl;
@ -489,7 +488,7 @@ namespace randomx {
void AssemblyGeneratorX86::h_FSCAL_R(Instruction& instr, int i) {
instr.dst %= RegisterCountFlt;
asmCode << "\txorps " << regF[instr.dst] << ", " << scaleMask << std::endl;
asmCode << "\txorps " << regF[instr.dst] << ", " << scaleMaskReg << std::endl;
traceflt(instr);
}
@ -504,8 +503,8 @@ namespace randomx {
instr.dst %= RegisterCountFlt;
genAddressReg(instr);
asmCode << "\tcvtdq2pd " << tempRegx << ", qword ptr [" << regScratchpadAddr << "+rax]" << std::endl;
asmCode << "\tandps " << tempRegx << ", " << mantissaMask << std::endl;
asmCode << "\torps " << tempRegx << ", " << exponentMask << std::endl;
asmCode << "\tandps " << tempRegx << ", " << mantissaMaskReg << std::endl;
asmCode << "\torps " << tempRegx << ", " << exponentMaskReg << std::endl;
asmCode << "\tdivpd " << regE[instr.dst] << ", " << tempRegx << std::endl;
traceflt(instr);
}

10
src/common.hpp
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@ -122,6 +122,16 @@ namespace randomx {
return minIndex;
}
constexpr int mantissaSize = 52;
constexpr int exponentSize = 11;
constexpr uint64_t mantissaMask = (1ULL << mantissaSize) - 1;
constexpr uint64_t exponentMask = (1ULL << exponentSize) - 1;
constexpr int exponentBias = 1023;
constexpr int dynamicExponentBits = 4;
constexpr int staticExponentBits = 4;
constexpr uint64_t constExponentBits = 0x300;
constexpr uint64_t dynamicMantissaMask = (1ULL << (mantissaSize + dynamicExponentBits)) - 1;
struct MemoryRegisters {
addr_t mx, ma;
uint8_t* memory = nullptr;

6
src/intrin_portable.h
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@ -312,12 +312,6 @@ inline __m128d load_cvt_i32x2(const void* addr) {
return _mm_cvtepi32_pd(ix);
}
template<int E>
constexpr uint64_t ieee_get_exponent_mask() {
static_assert(E > -1023, "Invalid exponent value");
return (uint64_t)(E + 1023U) << 52;
}
double loadDoublePortable(const void* addr);
uint64_t mulh(uint64_t, uint64_t);
int64_t smulh(int64_t, int64_t);

2
src/tests/benchmark.cpp
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@ -229,7 +229,7 @@ int main(int argc, char** argv) {
std::cout << "Calculated result: ";
result.print(std::cout);
if (noncesCount == 1000 && seedValue == 0)
std::cout << "Reference result: 092868e4cee629a5b3848b97a52199d8a158e5b56ab9064764cda7ff656f3741" << std::endl;
std::cout << "Reference result: 6d95d8d07fa3a80771f33d1b20452b61ab2d0bf21058b5e586fad38bf3e1e0ca" << std::endl;
if (!miningMode) {
std::cout << "Performance: " << 1000 * elapsed / noncesCount << " ms per hash" << std::endl;
}

56
src/virtual_machine.cpp
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@ -35,30 +35,40 @@ void randomx_vm::resetRoundingMode() {
initFpu();
}
constexpr int mantissaSize = 52;
constexpr int exponentSize = 11;
constexpr uint64_t mantissaMask = (1ULL << mantissaSize) - 1;
constexpr uint64_t exponentMask = (1ULL << exponentSize) - 1;
constexpr int exponentBias = 1023;
namespace randomx {
static inline uint64_t getSmallPositiveFloatBits(uint64_t entropy) {
auto exponent = entropy >> 59; //0..31
auto mantissa = entropy & mantissaMask;
exponent += exponentBias;
exponent &= exponentMask;
exponent <<= mantissaSize;
return exponent | mantissa;
}
static inline uint64_t getStaticExponent(uint64_t entropy) {
auto exponent = constExponentBits;
exponent |= (entropy >> (64 - staticExponentBits)) << dynamicExponentBits;
exponent <<= mantissaSize;
return exponent;
}
static inline uint64_t getFloatMask(uint64_t entropy) {
constexpr uint64_t mask22bit = (1ULL << 22) - 1;
return (entropy & mask22bit) | getStaticExponent(entropy);
}
static inline uint64_t getSmallPositiveFloatBits(uint64_t entropy) {
auto exponent = entropy >> 59; //0..31
auto mantissa = entropy & mantissaMask;
exponent += exponentBias;
exponent &= exponentMask;
exponent <<= mantissaSize;
return exponent | mantissa;
}
void randomx_vm::initialize() {
store64(&reg.a[0].lo, getSmallPositiveFloatBits(program.getEntropy(0)));
store64(&reg.a[0].hi, getSmallPositiveFloatBits(program.getEntropy(1)));
store64(&reg.a[1].lo, getSmallPositiveFloatBits(program.getEntropy(2)));
store64(&reg.a[1].hi, getSmallPositiveFloatBits(program.getEntropy(3)));
store64(&reg.a[2].lo, getSmallPositiveFloatBits(program.getEntropy(4)));
store64(&reg.a[2].hi, getSmallPositiveFloatBits(program.getEntropy(5)));
store64(&reg.a[3].lo, getSmallPositiveFloatBits(program.getEntropy(6)));
store64(&reg.a[3].hi, getSmallPositiveFloatBits(program.getEntropy(7)));
store64(&reg.a[0].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(0)));
store64(&reg.a[0].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(1)));
store64(&reg.a[1].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(2)));
store64(&reg.a[1].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(3)));
store64(&reg.a[2].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(4)));
store64(&reg.a[2].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(5)));
store64(&reg.a[3].lo, randomx::getSmallPositiveFloatBits(program.getEntropy(6)));
store64(&reg.a[3].hi, randomx::getSmallPositiveFloatBits(program.getEntropy(7)));
mem.ma = program.getEntropy(8) & randomx::CacheLineAlignMask;
mem.mx = program.getEntropy(10);
auto addressRegisters = program.getEntropy(12);
@ -70,10 +80,8 @@ void randomx_vm::initialize() {
addressRegisters >>= 1;
config.readReg3 = 6 + (addressRegisters & 1);
datasetOffset = (program.getEntropy(13) & randomx::DatasetExtraItems) * randomx::CacheLineSize;
constexpr uint64_t mask22bit = (1ULL << 22) - 1;
constexpr uint64_t maskExp240 = ieee_get_exponent_mask<-240>();
store64(&config.eMask[0], (program.getEntropy(14) & mask22bit) | maskExp240);
store64(&config.eMask[1], (program.getEntropy(15) & mask22bit) | maskExp240);
store64(&config.eMask[0], randomx::getFloatMask(program.getEntropy(14)));
store64(&config.eMask[1], randomx::getFloatMask(program.getEntropy(15)));
}
namespace randomx {

9
src/vm_interpreted.cpp
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@ -61,11 +61,10 @@ namespace randomx {
template<class Allocator, bool softAes>
FORCE_INLINE __m128d InterpretedVm<Allocator, softAes>::maskRegisterExponentMantissa(__m128d x) {
constexpr uint64_t mantissaMask64 = (1ULL << 52) - 1;
const __m128d mantissaMask = _mm_castsi128_pd(_mm_set_epi64x(mantissaMask64, mantissaMask64));
const __m128d exponentMask = _mm_load_pd((const double*)&config.eMask);
x = _mm_and_pd(x, mantissaMask);
x = _mm_or_pd(x, exponentMask);
const __m128d xmantissaMask = _mm_castsi128_pd(_mm_set_epi64x(dynamicMantissaMask, dynamicMantissaMask));
const __m128d xexponentMask = _mm_load_pd((const double*)&config.eMask);
x = _mm_and_pd(x, xmantissaMask);
x = _mm_or_pd(x, xexponentMask);
return x;
}

2
vcxproj/benchmark.vcxproj
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@ -96,7 +96,7 @@
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<Optimization>Disabled</Optimization>
<SDLCheck>true</SDLCheck>
<SDLCheck>false</SDLCheck>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
</ItemDefinitionGroup>