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Reworked conversion int -> float for register group E

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This commit is contained in:
tevador
2019-02-24 14:48:07 +01:00
parent f3b114af88
commit 790b382eda
2 changed files with 66 additions and 17 deletions
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src/InterpretedVirtualMachine.cpp
+40 -12
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@@ -29,6 +29,7 @@ along with RandomX. If not, see<http://www.gnu.org/licenses/>.
#include <cmath>
#include <cfloat>
#include <thread>
#include <climits>
#include "intrinPortable.h"
#include "reciprocal.h"
#ifdef STATS
@@ -108,9 +109,13 @@ namespace RandomX {
}
}
static bool isDenormal(double x) {
return std::fpclassify(x) == FP_SUBNORMAL;
}
FORCE_INLINE void InterpretedVirtualMachine::executeBytecode(int i, int_reg_t(&r)[8], __m128d (&f)[4], __m128d (&e)[4], __m128d (&a)[4]) {
auto& ibc = byteCode[i];
if(trace) printState(r, f, e, a);
//if(trace) printState(r, f, e, a);
switch (ibc.type)
{
case InstructionType::IADD_R: {
@@ -219,9 +224,8 @@ namespace RandomX {
} break;
case InstructionType::FDIV_M: {
__m128d fsrc = _mm_abs(load_cvt_i32x2(scratchpad + (*ibc.isrc & ibc.memMask)));
__m128d fdst = _mm_div_pd(*ibc.fdst, fsrc);
*ibc.fdst = _mm_max_pd(fdst, _mm_set_pd(DBL_MIN, DBL_MIN));
__m128d fsrc = ieee_set_exponent<-240>(load_cvt_i32x2(scratchpad + (*ibc.isrc & ibc.memMask)));
*ibc.fdst = _mm_div_pd(*ibc.fdst, fsrc);
} break;
case InstructionType::FSQRT_R: {
@@ -258,6 +262,18 @@ namespace RandomX {
else //if(ibc.type >= 20 && ibc.type <= 30)
print(0);
}
#ifdef FPUCHECK
if (ibc.type >= 26 && ibc.type <= 30) {
double lo = *(((double*)ibc.fdst) + 0);
double hi = *(((double*)ibc.fdst) + 1);
if (lo <= 0 || hi <= 0) {
std::stringstream ss;
ss << "Underflow in operation " << ibc.type;
printState(r, f, e, a);
throw std::runtime_error(ss.str());
}
}
#endif
}
void InterpretedVirtualMachine::execute() {
@@ -304,10 +320,10 @@ namespace RandomX {
f[1] = load_cvt_i32x2(scratchpad + spAddr1 + 8);
f[2] = load_cvt_i32x2(scratchpad + spAddr1 + 16);
f[3] = load_cvt_i32x2(scratchpad + spAddr1 + 24);
e[0] = _mm_abs(load_cvt_i32x2(scratchpad + spAddr1 + 32));
e[1] = _mm_abs(load_cvt_i32x2(scratchpad + spAddr1 + 40));
e[2] = _mm_abs(load_cvt_i32x2(scratchpad + spAddr1 + 48));
e[3] = _mm_abs(load_cvt_i32x2(scratchpad + spAddr1 + 56));
e[0] = ieee_set_exponent<-240>(load_cvt_i32x2(scratchpad + spAddr1 + 32));
e[1] = ieee_set_exponent<-240>(load_cvt_i32x2(scratchpad + spAddr1 + 40));
e[2] = ieee_set_exponent<-240>(load_cvt_i32x2(scratchpad + spAddr1 + 48));
e[3] = ieee_set_exponent<-240>(load_cvt_i32x2(scratchpad + spAddr1 + 56));
if (trace) {
std::cout << "iteration " << std::dec << iter << std::endl;
@@ -357,10 +373,22 @@ namespace RandomX {
store64(scratchpad + spAddr1 + 48, r[6]);
store64(scratchpad + spAddr1 + 56, r[7]);
f[0] = _mm_mul_pd(f[0], e[0]);
f[1] = _mm_mul_pd(f[1], e[1]);
f[2] = _mm_mul_pd(f[2], e[2]);
f[3] = _mm_mul_pd(f[3], e[3]);
f[0] = _mm_xor_pd(f[0], e[0]);
f[1] = _mm_xor_pd(f[1], e[1]);
f[2] = _mm_xor_pd(f[2], e[2]);
f[3] = _mm_xor_pd(f[3], e[3]);
#ifdef FPUCHECK
for(int i = 0; i < 4; ++i) {
double lo = *(((double*)&f[i]) + 0);
double hi = *(((double*)&f[i]) + 1);
if (isDenormal(lo) || isDenormal(hi)) {
std::stringstream ss;
ss << "Denormal f" << i;
throw std::runtime_error(ss.str());
}
}
#endif
_mm_store_pd((double*)(scratchpad + spAddr0 + 0), f[0]);
_mm_store_pd((double*)(scratchpad + spAddr0 + 16), f[1]);