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Added const folding support for $signed and $unsigned

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This commit is contained in:
Clifford Wolf 2013-12-05 13:09:41 +01:00
parent 5c39948ead
commit e935bb6eda
1 changed files with 7 additions and 0 deletions
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7
frontends/ast/simplify.cc
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@ -1205,6 +1205,13 @@ skip_dynamic_range_lvalue_expansion:;
newNode = mkconst_bits(y.bits, sign_hint); newNode = mkconst_bits(y.bits, sign_hint);
} }
break; break;
case AST_TO_SIGNED:
case AST_TO_UNSIGNED:
if (children[0]->type == AST_CONSTANT) {
RTLIL::Const y = children[0]->bitsAsConst(width_hint, sign_hint);
newNode = mkconst_bits(y.bits, type == AST_TO_SIGNED);
}
break;
if (0) { case AST_BIT_AND: const_func = RTLIL::const_and; } if (0) { case AST_BIT_AND: const_func = RTLIL::const_and; }
if (0) { case AST_BIT_OR: const_func = RTLIL::const_or; } if (0) { case AST_BIT_OR: const_func = RTLIL::const_or; }
if (0) { case AST_BIT_XOR: const_func = RTLIL::const_xor; } if (0) { case AST_BIT_XOR: const_func = RTLIL::const_xor; }