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Fix runtime error on shr INT_MAX

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Krystine Sherwin 2025-02-14 13:29:24 +13:00
parent db5b76edc1
commit 4c728968a3
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1 changed files with 4 additions and 0 deletions
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4
passes/opt/opt_expr.cc
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@ -1315,6 +1315,10 @@ skip_fine_alu:
RTLIL::SigSpec sig_a = assign_map(cell->getPort(ID::A));
RTLIL::SigSpec sig_y(cell->type == ID($shiftx) ? RTLIL::State::Sx : RTLIL::State::S0, cell->getParam(ID::Y_WIDTH).as_int());
// Limit indexing to the size of a, which is behaviourally identical (result is all 0)
// and avoids integer overflow of i + shift_bits when e.g. ID::B == INT_MAX
shift_bits = min(shift_bits, GetSize(sig_a));
if (cell->type != ID($shiftx) && GetSize(sig_a) < GetSize(sig_y))
sig_a.extend_u0(GetSize(sig_y), cell->getParam(ID::A_SIGNED).as_bool());