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Implemented const folding of ternary op with undef select

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Clifford Wolf 2013-11-08 04:44:09 +01:00
parent 81b8f3292e
commit 4abc8e695a
1 changed files with 8 additions and 0 deletions
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8
frontends/ast/simplify.cc
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@ -1074,6 +1074,14 @@ skip_dynamic_range_lvalue_expansion:;
if (choice != NULL && choice->type == AST_CONSTANT) {
RTLIL::Const y = choice->bitsAsConst(width_hint, sign_hint);
newNode = mkconst_bits(y.bits, sign_hint);
} else if (children[1]->type == AST_CONSTANT && children[2]->type == AST_CONSTANT) {
RTLIL::Const a = children[1]->bitsAsConst(width_hint, sign_hint);
RTLIL::Const b = children[2]->bitsAsConst(width_hint, sign_hint);
assert(a.bits.size() == b.bits.size());
for (size_t i = 0; i < a.bits.size(); i++)
if (a.bits[i] != b.bits[i])
a.bits[i] = RTLIL::State::Sx;
newNode = mkconst_bits(a.bits, sign_hint);
}
}
break;