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further improved early width and sign detection in ast simplifier

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This commit is contained in:
Clifford Wolf 2013-11-04 06:04:42 +01:00
parent cd0fe7d786
commit 472117d532
2 changed files with 117 additions and 11 deletions
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7
frontends/ast/genrtlil.cc
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@ -665,9 +665,12 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint)
break;
case AST_MEMRD:
if (!is_signed)
if (!id2ast->is_signed)
sign_hint = false;
width_hint = std::max(width_hint, current_module->memories.at(str)->width);
if (!id2ast->children[0]->range_valid)
log_error("Failed to detect with of memory access `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
this_width = id2ast->children[0]->range_left - id2ast->children[0]->range_right + 1;
width_hint = std::max(width_hint, this_width);
break;
// everything should have been handled above -> print error if not.