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Refactoring (#95)

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* Blake2Generator::getInt32 renamed to getUInt32 to avoid confusion
* isPowerOf2 renamed to isZeroOrPowerOf2 to avoid confusion
* added asserts to validate the input/output size of AES functions
* fixed possible overflow in JitCompilerX86::getCodeSize (unused function)
This commit is contained in:
tevador 2019-07-03 18:13:20 +02:00 committed by GitHub
parent 08f7a2c2f2
commit 89aba80925
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 20 additions and 15 deletions
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4
src/aes_hash.cpp
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@ -27,6 +27,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "soft_aes.h"
#include <cassert>
#define AES_HASH_1R_STATE0 0xd7983aad, 0xcc82db47, 0x9fa856de, 0x92b52c0d
#define AES_HASH_1R_STATE1 0xace78057, 0xf59e125a, 0x15c7b798, 0x338d996e
@ -50,6 +51,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
template<bool softAes>
void hashAes1Rx4(const void *input, size_t inputSize, void *hash) {
assert(inputSize % 64 == 0);
const uint8_t* inptr = (uint8_t*)input;
const uint8_t* inputEnd = inptr + inputSize;
@ -118,6 +120,7 @@ template void hashAes1Rx4<true>(const void *input, size_t inputSize, void *hash)
*/
template<bool softAes>
void fillAes1Rx4(void *state, size_t outputSize, void *buffer) {
assert(outputSize % 64 == 0);
const uint8_t* outptr = (uint8_t*)buffer;
const uint8_t* outputEnd = outptr + outputSize;
@ -168,6 +171,7 @@ template void fillAes1Rx4<false>(void *state, size_t outputSize, void *buffer);
template<bool softAes>
void fillAes4Rx4(void *state, size_t outputSize, void *buffer) {
assert(outputSize % 64 == 0);
const uint8_t* outptr = (uint8_t*)buffer;
const uint8_t* outputEnd = outptr + outputSize;

2
src/assembly_generator_x86.cpp
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@ -446,7 +446,7 @@ namespace randomx {
void AssemblyGeneratorX86::h_IMUL_RCP(Instruction& instr, int i) {
uint64_t divisor = instr.getImm32();
if (!isPowerOf2(divisor)) {
if (!isZeroOrPowerOf2(divisor)) {
registerUsage[instr.dst] = i;
asmCode << "\tmov rax, " << randomx_reciprocal(divisor) << std::endl;
asmCode << "\timul " << regR[instr.dst] << ", rax" << std::endl;

2
src/blake2_generator.cpp
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@ -46,7 +46,7 @@ namespace randomx {
return data[dataIndex++];
}
uint32_t Blake2Generator::getInt32() {
uint32_t Blake2Generator::getUInt32() {
checkData(4);
auto ret = load32(&data[dataIndex]);
dataIndex += 4;

2
src/blake2_generator.hpp
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@ -36,7 +36,7 @@ namespace randomx {
public:
Blake2Generator(const void* seed, size_t seedSize, int nonce = 0);
uint8_t getByte();
uint32_t getInt32();
uint32_t getUInt32();
private:
void checkData(const size_t);

2
src/bytecode_machine.cpp
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@ -244,7 +244,7 @@ namespace randomx {
if (opcode < ceil_IMUL_RCP) {
uint64_t divisor = instr.getImm32();
if (!isPowerOf2(divisor)) {
if (!isZeroOrPowerOf2(divisor)) {
auto dst = instr.dst % RegistersCount;
ibc.type = InstructionType::IMUL_R;
ibc.idst = &nreg->r[dst];

2
src/common.hpp
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@ -145,7 +145,7 @@ namespace randomx {
constexpr int RegisterNeedsDisplacement = 5; //x86 r13 register
constexpr int RegisterNeedsSib = 4; //x86 r12 register
inline bool isPowerOf2(uint64_t x) {
inline bool isZeroOrPowerOf2(uint64_t x) {
return (x & (x - 1)) == 0;
}

4
src/jit_compiler_x86.cpp
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@ -197,7 +197,7 @@ namespace randomx {
static const uint8_t* NOPX[] = { NOP1, NOP2, NOP3, NOP4, NOP5, NOP6, NOP7, NOP8 };
size_t JitCompilerX86::getCodeSize() {
return codePos - prologueSize;
return codePos < prologueSize ? 0 : codePos - prologueSize;
}
JitCompilerX86::JitCompilerX86() {
@ -580,7 +580,7 @@ namespace randomx {
void JitCompilerX86::h_IMUL_RCP(Instruction& instr, int i) {
uint64_t divisor = instr.getImm32();
if (!isPowerOf2(divisor)) {
if (!isZeroOrPowerOf2(divisor)) {
registerUsage[instr.dst] = i;
emit(MOV_RAX_I);
emit64(randomx_reciprocal_fast(divisor));

15
src/superscalar.cpp
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@ -37,6 +37,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "superscalar.hpp"
#include "intrin_portable.h"
#include "reciprocal.h"
#include "common.hpp"
namespace randomx {
@ -334,7 +335,7 @@ namespace randomx {
return false;
if (availableRegisters.size() > 1) {
index = gen.getInt32() % availableRegisters.size();
index = gen.getUInt32() % availableRegisters.size();
}
else {
index = 0;
@ -447,7 +448,7 @@ namespace randomx {
case SuperscalarInstructionType::IADD_C8:
case SuperscalarInstructionType::IADD_C9: {
mod_ = 0;
imm32_ = gen.getInt32();
imm32_ = gen.getUInt32();
opGroup_ = SuperscalarInstructionType::IADD_C7;
opGroupPar_ = -1;
} break;
@ -456,7 +457,7 @@ namespace randomx {
case SuperscalarInstructionType::IXOR_C8:
case SuperscalarInstructionType::IXOR_C9: {
mod_ = 0;
imm32_ = gen.getInt32();
imm32_ = gen.getUInt32();
opGroup_ = SuperscalarInstructionType::IXOR_C7;
opGroupPar_ = -1;
} break;
@ -466,7 +467,7 @@ namespace randomx {
mod_ = 0;
imm32_ = 0;
opGroup_ = SuperscalarInstructionType::IMULH_R;
opGroupPar_ = gen.getInt32();
opGroupPar_ = gen.getUInt32();
} break;
case SuperscalarInstructionType::ISMULH_R: {
@ -474,14 +475,14 @@ namespace randomx {
mod_ = 0;
imm32_ = 0;
opGroup_ = SuperscalarInstructionType::ISMULH_R;
opGroupPar_ = gen.getInt32();
opGroupPar_ = gen.getUInt32();
} break;
case SuperscalarInstructionType::IMUL_RCP: {
mod_ = 0;
do {
imm32_ = gen.getInt32();
} while ((imm32_ & (imm32_ - 1)) == 0);
imm32_ = gen.getUInt32();
} while (isZeroOrPowerOf2(imm32_));
opGroup_ = SuperscalarInstructionType::IMUL_RCP;
opGroupPar_ = -1;
} break;

2
src/tests/perf-simulation.cpp
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@ -478,7 +478,7 @@ int analyze(randomx::Program& p) {
if (opcode < randomx::ceil_IMUL_RCP) {
uint64_t divisor = instr.getImm32();
if (!randomx::isPowerOf2(divisor)) {
if (!randomx::isZeroOrPowerOf2(divisor)) {
instr.dst = instr.dst % randomx::RegistersCount;
instr.opcode |= DST_INT;
registerUsage[instr.dst].lastUsed = i;