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Avoid creation of bogus initial blocks for assert/assume in always @*

This commit is contained in:
Clifford Wolf 2016-09-06 17:34:42 +02:00
parent dcb5a6ea8a
commit 97583ab729
3 changed files with 13 additions and 1 deletions
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1
frontends/ast/ast.cc
View File

@ -52,6 +52,7 @@ namespace AST_INTERNAL {
RTLIL::SigSpec ignoreThisSignalsInInitial;
AstNode *current_always, *current_top_block, *current_block, *current_block_child;
AstModule *current_module;
bool current_always_clocked;
}
// convert node types to string

1
frontends/ast/ast.h
View File

@ -310,6 +310,7 @@ namespace AST_INTERNAL
extern RTLIL::SigSpec ignoreThisSignalsInInitial;
extern AST::AstNode *current_always, *current_top_block, *current_block, *current_block_child;
extern AST::AstModule *current_module;
extern bool current_always_clocked;
struct ProcessGenerator;
}

12
frontends/ast/simplify.cc
View File

@ -397,9 +397,18 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
auto backup_current_block_child = current_block_child;
auto backup_current_top_block = current_top_block;
auto backup_current_always = current_always;
auto backup_current_always_clocked = current_always_clocked;
if (type == AST_ALWAYS || type == AST_INITIAL)
{
current_always = this;
current_always_clocked = false;
if (type == AST_ALWAYS)
for (auto child : children)
if (child->type == AST_POSEDGE || child->type == AST_NEGEDGE)
current_always_clocked = true;
}
int backup_width_hint = width_hint;
bool backup_sign_hint = sign_hint;
@ -652,6 +661,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
current_block_child = backup_current_block_child;
current_top_block = backup_current_top_block;
current_always = backup_current_always;
current_always_clocked = backup_current_always_clocked;
for (auto it = backup_scope.begin(); it != backup_scope.end(); it++) {
if (it->second == NULL)
@ -1367,7 +1377,7 @@ skip_dynamic_range_lvalue_expansion:;
AstNode *wire_en = new AstNode(AST_WIRE);
wire_en->str = id_en;
current_ast_mod->children.push_back(wire_en);
if (current_always == nullptr || current_always->type != AST_INITIAL) {
if (current_always_clocked) {
current_ast_mod->children.push_back(new AstNode(AST_INITIAL, new AstNode(AST_BLOCK, new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER), AstNode::mkconst_int(0, false, 1)))));
current_ast_mod->children.back()->children[0]->children[0]->children[0]->str = id_en;
}