diff options
Diffstat (limited to 'frontends/ast/simplify.cc')
| -rw-r--r-- | frontends/ast/simplify.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc index 5a2d1ae6c..f19befe2a 100644 --- a/frontends/ast/simplify.cc +++ b/frontends/ast/simplify.cc @@ -258,6 +258,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, } break; + case AST_TO_BITS: case AST_TO_SIGNED: case AST_TO_UNSIGNED: case AST_CONCAT: @@ -442,6 +443,17 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, goto apply_newNode; } + // evaluate TO_BITS nodes + if (type == AST_TO_BITS) { + if (children[0]->type != AST_CONSTANT) + log_error("Left operand of to_bits expression is not constant at %s:%d!\n", filename.c_str(), linenum); + if (children[1]->type != AST_CONSTANT) + log_error("Right operand of to_bits expression is not constant at %s:%d!\n", filename.c_str(), linenum); + RTLIL::Const new_value = children[1]->bitsAsConst(children[0]->bitsAsConst().as_int(), children[1]->is_signed); + newNode = mkconst_bits(new_value.bits, children[1]->is_signed); + goto apply_newNode; + } + // annotate constant ranges if (type == AST_RANGE) { bool old_range_valid = range_valid; |