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Don't simplify guard to skip instructions #4307

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Merged
tautschnig merged 1 commit into from
Mar 1, 2019
Merged

Don't simplify guard to skip instructions #4307

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10 changes: 4 additions & 6 deletions src/goto-symex/symex_goto.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -106,15 +106,13 @@ void goto_symext::symex_goto(statet &state)
}
}

exprt simpl_state_guard = state.guard.as_expr();
do_simplify(simpl_state_guard);

// No point executing both branches of an unconditional goto.
if(
new_guard.is_true() && // We have an unconditional goto, AND
// either there are no blocks between us and the target in the
// surrounding scope
(simpl_state_guard.is_true() ||
// either there are no reachable blocks between us and the target in the
// surrounding scope (because state.guard == true implies there is no path
// around this GOTO instruction)
(state.guard.is_true() ||
// or there is another block, but we're doing path exploration so
// we're going to skip over it for now and return to it later.
symex_config.doing_path_exploration))
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