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Simplified division in interpreted mode

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Fixed incorrect condition code in JitCompilerX86
Refactoring
This commit is contained in:
tevador
2019-02-15 10:41:02 +01:00
parent 1df975e583
commit 447e8a1d4f
5 changed files with 35 additions and 47 deletions
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src/InterpretedVirtualMachine.cpp
+25 -32
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@@ -33,7 +33,6 @@ along with RandomX. If not, see<http://www.gnu.org/licenses/>.
#ifdef STATS
#include <algorithm>
#endif
#include "divideByConstantCodegen.h"
#ifdef FPUCHECK
constexpr bool fpuCheck = true;
@@ -136,23 +135,21 @@ namespace RandomX {
} break;
case InstructionType::IDIV_C: {
if (ibc.signedMultiplier != 0) {
int_reg_t dividend = *ibc.idst;
int_reg_t quotient = dividend >> ibc.preShift;
if (ibc.increment) {
quotient = quotient == UINT64_MAX ? UINT64_MAX : quotient + 1;
}
quotient = mulh(quotient, ibc.signedMultiplier);
quotient >>= ibc.postShift;
*ibc.idst += quotient;
}
else {
*ibc.idst += *ibc.idst >> ibc.shift;
}
uint64_t dividend = *ibc.idst;
uint64_t quotient = dividend / ibc.imm;
*ibc.idst += quotient;
} break;
case InstructionType::ISDIV_C: {
if (ibc.simm != -1) {
int64_t dividend = unsigned64ToSigned2sCompl(*ibc.idst);
int64_t quotient = dividend / ibc.simm;
*ibc.idst += quotient;
}
else {
uint64_t quotient = ~(*ibc.idst) + 1;
*ibc.idst += quotient;
}
} break;
case InstructionType::INEG_R: {
@@ -204,8 +201,8 @@ namespace RandomX {
} break;
case InstructionType::FSCAL_R: {
const __m128d signMask = _mm_castsi128_pd(_mm_set1_epi64x(0x81F0000000000000));
*ibc.fdst = _mm_xor_pd(*ibc.fdst, signMask);
const __m128d mask = _mm_castsi128_pd(_mm_set1_epi64x(0x81F0000000000000));
*ibc.fdst = _mm_xor_pd(*ibc.fdst, mask);
} break;
case InstructionType::FMUL_R: {
@@ -516,20 +513,7 @@ namespace RandomX {
auto dst = instr.dst % RegistersCount;
ibc.type = InstructionType::IDIV_C;
ibc.idst = &r[dst];
if (divisor & (divisor - 1)) {
magicu_info mi = compute_unsigned_magic_info(divisor, sizeof(uint64_t) * 8);
ibc.signedMultiplier = mi.multiplier;
ibc.preShift = mi.pre_shift;
ibc.postShift = mi.post_shift;
ibc.increment = mi.increment;
}
else {
ibc.signedMultiplier = 0;
int shift = 0;
while (divisor >>= 1)
++shift;
ibc.shift = shift;
}
ibc.imm = divisor;
}
else {
ibc.type = InstructionType::NOP;
@@ -537,7 +521,16 @@ namespace RandomX {
} break;
CASE_REP(ISDIV_C) {
ibc.type = InstructionType::NOP;
int32_t divisor = unsigned32ToSigned2sCompl(instr.imm32);
if (divisor != 0) {
auto dst = instr.dst % RegistersCount;
ibc.type = InstructionType::ISDIV_C;
ibc.idst = &r[dst];
ibc.simm = divisor;
}
else {
ibc.type = InstructionType::NOP;
}
} break;
CASE_REP(INEG_R) {