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Added support for "2**n" shifter encoding

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This commit is contained in:
Clifford Wolf 2013-08-12 14:47:50 +02:00
parent ccf36cb7d8
commit 759852914d
2 changed files with 29 additions and 20 deletions
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4
frontends/ast/genrtlil.cc
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@ -974,8 +974,12 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
width = width_hint;
if (type == AST_MUL)
width = std::min(left.width + right.width, width_hint);
if (type == AST_POW)
width = width_hint;
}
is_signed = children[0]->is_signed && children[1]->is_signed;
if (!flag_noopt && type == AST_POW && left.is_fully_const() && left.as_int() == 2)
return binop2rtlil(this, "$shl", width, RTLIL::SigSpec(1, left.width), right);
return binop2rtlil(this, type_name, width, left, right);
}