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ast: cap dynamic range select to size of signal, suppresses warnings

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Eddie Hung 2020-04-01 09:59:23 -07:00
parent 5132f4099b
commit c22fb76664
1 changed files with 2 additions and 1 deletions
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3
frontends/ast/simplify.cc
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@ -1732,8 +1732,9 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true)); AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true));
AstNode *lvalue = children[0]->clone(); AstNode *lvalue = children[0]->clone();
lvalue->delete_children(); lvalue->delete_children();
int end_bit = std::min(start_bit+result_width,source_width) - 1;
lvalue->children.push_back(new AstNode(AST_RANGE, lvalue->children.push_back(new AstNode(AST_RANGE,
mkconst_int(start_bit+result_width-1, true), mkconst_int(start_bit, true))); mkconst_int(end_bit, true), mkconst_int(start_bit, true)));
cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone()))); cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone())));
newNode->children.push_back(cond); newNode->children.push_back(cond);
} }