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Added non-std verilog assume() statement

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This commit is contained in:
Clifford Wolf 2015-02-26 18:47:39 +01:00
parent b005eedf36
commit 1f1deda888
10 changed files with 67 additions and 25 deletions
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1
frontends/ast/ast.cc
View file

@ -90,6 +90,7 @@ std::string AST::type2str(AstNodeType type)
X(AST_IDENTIFIER)
X(AST_PREFIX)
X(AST_ASSERT)
X(AST_ASSUME)
X(AST_FCALL)
X(AST_TO_BITS)
X(AST_TO_SIGNED)

1
frontends/ast/ast.h
View file

@ -64,6 +64,7 @@ namespace AST
AST_IDENTIFIER,
AST_PREFIX,
AST_ASSERT,
AST_ASSUME,
AST_FCALL,
AST_TO_BITS,

11
frontends/ast/genrtlil.cc
View file

@ -1265,19 +1265,22 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
// generate $assert cells
case AST_ASSERT:
case AST_ASSUME:
{
log_assert(children.size() == 2);
RTLIL::SigSpec check = children[0]->genRTLIL();
log_assert(check.size() == 1);
if (GetSize(check) != 1)
check = current_module->ReduceBool(NEW_ID, check);
RTLIL::SigSpec en = children[1]->genRTLIL();
log_assert(en.size() == 1);
if (GetSize(en) != 1)
en = current_module->ReduceBool(NEW_ID, en);
std::stringstream sstr;
sstr << "$assert$" << filename << ":" << linenum << "$" << (autoidx++);
sstr << (type == AST_ASSERT ? "$assert$" : "$assume$") << filename << ":" << linenum << "$" << (autoidx++);
RTLIL::Cell *cell = current_module->addCell(sstr.str(), "$assert");
RTLIL::Cell *cell = current_module->addCell(sstr.str(), type == AST_ASSERT ? "$assert" : "$assume");
cell->attributes["\\src"] = stringf("%s:%d", filename.c_str(), linenum);
for (auto &attr : attributes) {

7
frontends/ast/simplify.cc
View file

@ -1211,7 +1211,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
}
skip_dynamic_range_lvalue_expansion:;
if (stage > 1 && type == AST_ASSERT && current_block != NULL)
if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && current_block != NULL)
{
std::stringstream sstr;
sstr << "$assert$" << filename << ":" << linenum << "$" << (autoidx++);
@ -1255,7 +1255,7 @@ skip_dynamic_range_lvalue_expansion:;
newNode->children.push_back(assign_check);
newNode->children.push_back(assign_en);
AstNode *assertnode = new AstNode(AST_ASSERT);
AstNode *assertnode = new AstNode(type);
assertnode->children.push_back(new AstNode(AST_IDENTIFIER));
assertnode->children.push_back(new AstNode(AST_IDENTIFIER));
assertnode->children[0]->str = id_check;
@ -1266,9 +1266,8 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (stage > 1 && type == AST_ASSERT && children.size() == 1)
if (stage > 1 && (type == AST_ASSERT || type == AST_ASSUME) && children.size() == 1)
{
children[0] = new AstNode(AST_REDUCE_BOOL, children[0]->clone());
children.push_back(mkconst_int(1, false, 1));
did_something = true;
}