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satgen: $priority match x-prop against simplemap

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This commit is contained in:
Emil J. Tywoniak 2026-01-20 19:44:10 +01:00
parent ed58bb6bb4
commit 39d960344b
1 changed files with 8 additions and 2 deletions
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10
kernel/satgen.cc
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@ -459,8 +459,14 @@ bool SatGen::importCell(RTLIL::Cell *cell, int timestep)
ez->assume(ez->IFF(undef_y[0], undef_a[0]));
}
for (size_t i = 1; i < a.size(); i++) {
any_previous_undef = ez->OR(any_previous_undef, undef_a[i]);
ez->assume(ez->IFF(undef_y[i], ez->AND(ez->NOT(active_so_far[i - 1]), any_previous_undef)));
int inactive_val = !polarity[i] ? ez->CONST_TRUE : ez->CONST_FALSE;
// $mux emulation
int is_active = ez->XOR(inactive_val, a[i]);
int undef_because_s = ez->AND(any_previous_undef, ez->OR(is_active, undef_a[i]));
int undef_because_a = ez->AND(ez->OR(any_previous_undef, ez->NOT(active_so_far[i-1])), undef_a[i]);
int undef = ez->OR(undef_because_s, undef_because_a);
any_previous_undef = ez->OR(any_previous_undef, is_active);
ez->assume(ez->IFF(undef_y[i], undef));
}
undefGating(y, yy, undef_y);
}