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Implementation of EXP with gmp

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Paweł Bylica 2015-01-19 15:20:50 +01:00
parent 100de855ec
commit 939e94a101
1 changed files with 11 additions and 4 deletions
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15
libevmjit/Arith256.cpp
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@ -260,10 +260,17 @@ extern "C"
EXPORT void arith_exp(i256* _arg1, i256* _arg2, i256* o_result) EXPORT void arith_exp(i256* _arg1, i256* _arg2, i256* o_result)
{ {
bigint left = llvm2eth(*_arg1); *o_result = {};
bigint right = llvm2eth(*_arg2);
auto ret = static_cast<u256>(boost::multiprecision::powm(left, right, bigint(2) << 256)); static mp_limb_t mod_limbs[nLimbs + 1] = {};
*o_result = eth2llvm(ret); mod_limbs[nLimbs] = 1;
static const mpz_t mod{nLimbs + 1, nLimbs + 1, &mod_limbs[0]};
mpz_t x{nLimbs, countLimbs(_arg1), reinterpret_cast<mp_limb_t*>(_arg1)};
mpz_t y{nLimbs, countLimbs(_arg2), reinterpret_cast<mp_limb_t*>(_arg2)};
mpz_t z{nLimbs, 0, reinterpret_cast<mp_limb_t*>(o_result)};
mpz_powm(z, x, y, mod);
} }
EXPORT void arith_mulmod(i256* _arg1, i256* _arg2, i256* _arg3, i256* o_result) EXPORT void arith_mulmod(i256* _arg1, i256* _arg2, i256* _arg3, i256* o_result)