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