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Added mem2reg option to verilog frontend

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This commit is contained in:
Clifford Wolf 2013-03-24 11:13:32 +01:00
parent 6960df7285
commit df9753d398
5 changed files with 31 additions and 11 deletions
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11
frontends/ast/simplify.cc
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@ -57,7 +57,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage)
if (!flag_nomem2reg && attributes.count("\\nomem2reg") == 0)
{
std::set<AstNode*> mem2reg_set, mem2reg_candidates;
mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, false, false);
mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, false, false, flag_mem2reg);
for (auto node : mem2reg_set)
{
@ -924,7 +924,7 @@ void AstNode::replace_ids(std::map<std::string, std::string> &rules)
}
// find memories that should be replaced by registers
void AstNode::mem2reg_as_needed_pass1(std::set<AstNode*> &mem2reg_set, std::set<AstNode*> &mem2reg_candidates, bool sync_proc, bool async_proc)
void AstNode::mem2reg_as_needed_pass1(std::set<AstNode*> &mem2reg_set, std::set<AstNode*> &mem2reg_candidates, bool sync_proc, bool async_proc, bool force_mem2reg)
{
if ((type == AST_ASSIGN_LE && async_proc) || (type == AST_ASSIGN_EQ && (sync_proc || async_proc)))
if (children[0]->type == AST_IDENTIFIER && children[0]->id2ast && children[0]->id2ast->type == AST_MEMORY &&
@ -938,9 +938,12 @@ void AstNode::mem2reg_as_needed_pass1(std::set<AstNode*> &mem2reg_set, std::set<
mem2reg_candidates.insert(children[0]->id2ast);
}
if (type == AST_MEMORY && attributes.count("\\mem2reg") > 0)
if (type == AST_MEMORY && (attributes.count("\\mem2reg") > 0 || force_mem2reg))
mem2reg_set.insert(this);
if (type == AST_MODULE && attributes.count("\\mem2reg") > 0)
force_mem2reg = true;
if (type == AST_ALWAYS) {
for (auto child : children) {
if (child->type == AST_POSEDGE || child->type == AST_NEGEDGE)
@ -950,7 +953,7 @@ void AstNode::mem2reg_as_needed_pass1(std::set<AstNode*> &mem2reg_set, std::set<
}
for (auto child : children)
child->mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, sync_proc, async_proc);
child->mem2reg_as_needed_pass1(mem2reg_set, mem2reg_candidates, sync_proc, async_proc, force_mem2reg);
}
// actually replace memories with registers