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// vmsbc.vvm vd, vs2, rs1
require(!(insn.rd() == 0 && P.VU.vlmul > 1));
VI_VV_LOOP_CARRY
({
auto v0 = P.VU.elt<uint64_t>(0, midx);
const uint64_t mmask = (UINT64_MAX << (64 - mlen)) >> (64 - mlen - mpos);
const uint128_t op_mask = (UINT64_MAX >> (64 - sew));
uint64_t carry = (v0 >> mpos) & 0x1;
uint128_t res = (op_mask & vs1) - (op_mask & vs2) - carry;
carry = (res >> sew) & 0x1u;
vd = (vd & ~mmask) | ((carry << mpos) & mmask);
})
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