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Added handling of real-valued parameters/localparams

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This commit is contained in:
Clifford Wolf 2014-06-14 12:00:47 +02:00
parent fc7b6d172a
commit 9bd7d5c468
4 changed files with 62 additions and 24 deletions
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13
frontends/ast/ast.cc
View file

@ -185,6 +185,7 @@ AstNode::AstNode(AstNodeType type, AstNode *child1, AstNode *child2)
range_left = -1;
range_right = 0;
integer = 0;
realvalue = 0;
id2ast = NULL;
basic_prep = false;
@ -278,6 +279,8 @@ void AstNode::dumpAst(FILE *f, std::string indent)
fprintf(f, " range=[%d:%d]%s", range_left, range_right, range_valid ? "" : "!");
if (integer != 0)
fprintf(f, " int=%u", (int)integer);
if (realvalue != 0)
fprintf(f, " real=%e", realvalue);
fprintf(f, "\n");
for (auto &it : attributes) {
@ -775,18 +778,20 @@ double AstNode::asReal(bool is_signed)
RTLIL::Const val;
val.bits = bits;
double p = exp2(val.bits.size()-32);
double p = exp2(int(val.bits.size())-32);
if (val.bits.size() > 32)
val.bits.erase(val.bits.begin(), val.bits.begin()+(val.bits.size()-32));
int32_t v = val.as_int() << (32-val.bits.size());
val.bits.erase(val.bits.begin(), val.bits.begin()+(int(val.bits.size())-32));
int32_t v = val.as_int() << (32-int(val.bits.size()));
if (is_signed)
return v * p;
return uint32_t(v) * p;
}
if (type == AST_REALVALUE)
return realvalue;
return 0;
log_abort();
}
// create a new AstModule from an AST_MODULE AST node

51
frontends/ast/simplify.cc
View file

@ -48,6 +48,13 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
AstNode *newNode = NULL;
bool did_something = false;
#if 0
log("-------------\n");
log("const_fold=%d, at_zero=%d, in_lvalue=%d, stage=%d, width_hint=%d, sign_hint=%d, in_param=%d\n",
int(const_fold), int(at_zero), int(in_lvalue), int(stage), int(width_hint), int(sign_hint), int(in_param));
dumpAst(NULL, "> ");
#endif
if (stage == 0)
{
assert(type == AST_MODULE);
@ -260,8 +267,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
while (!children[0]->basic_prep && children[0]->simplify(false, false, false, stage, -1, false, true) == true)
did_something = true;
children[0]->detectSignWidth(width_hint, sign_hint);
if (children.size() > 1) {
assert(children[1]->type == AST_RANGE);
if (children.size() > 1 && children[1]->type == AST_RANGE) {
while (!children[1]->basic_prep && children[1]->simplify(false, false, false, stage, -1, false, true) == true)
did_something = true;
if (!children[1]->range_valid)
@ -519,18 +525,37 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
}
// trim/extend parameters
if ((type == AST_PARAMETER || type == AST_LOCALPARAM) && children[0]->type == AST_CONSTANT && children.size() > 1) {
if (!children[1]->range_valid)
log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
int width = children[1]->range_left - children[1]->range_right + 1;
if (width != int(children[0]->bits.size())) {
RTLIL::SigSpec sig(children[0]->bits);
sig.extend_u0(width, children[0]->is_signed);
AstNode *old_child_0 = children[0];
children[0] = mkconst_bits(sig.as_const().bits, children[0]->is_signed);
delete old_child_0;
if (type == AST_PARAMETER || type == AST_LOCALPARAM) {
if (children.size() > 1 && children[1]->type == AST_RANGE) {
if (children[0]->type == AST_REALVALUE) {
int intvalue = round(children[0]->realvalue);
log("Warning: converting real value %e to integer %d at %s:%d.\n",
children[0]->realvalue, intvalue, filename.c_str(), linenum);
delete children[0];
children[0] = mkconst_int(intvalue, sign_hint);
did_something = true;
}
if (children[0]->type == AST_CONSTANT) {
if (!children[1]->range_valid)
log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
int width = children[1]->range_left - children[1]->range_right + 1;
if (width != int(children[0]->bits.size())) {
RTLIL::SigSpec sig(children[0]->bits);
sig.extend_u0(width, children[0]->is_signed);
AstNode *old_child_0 = children[0];
children[0] = mkconst_bits(sig.as_const().bits, children[0]->is_signed);
delete old_child_0;
}
children[0]->is_signed = is_signed;
}
} else
if (children.size() > 1 && children[1]->type == AST_REALVALUE && children[0]->type == AST_CONSTANT) {
double as_realvalue = children[0]->asReal(sign_hint);
delete children[0];
children[0] = new AstNode(AST_REALVALUE);
children[0]->realvalue = as_realvalue;
did_something = true;
}
children[0]->is_signed = is_signed;
}
// annotate identifiers using scope resolution and create auto-wires as needed

5
frontends/verilog/lexer.l
View file

@ -168,6 +168,7 @@ namespace VERILOG_FRONTEND {
"integer" { return TOK_INTEGER; }
"signed" { return TOK_SIGNED; }
"genvar" { return TOK_GENVAR; }
"real" { return TOK_REAL; }
[0-9]+ {
frontend_verilog_yylval.string = new std::string(yytext);
@ -181,12 +182,12 @@ namespace VERILOG_FRONTEND {
[0-9][0-9_]*\.[0-9][0-9_]*([eE][-+]?[0-9_]+)? {
frontend_verilog_yylval.string = new std::string(yytext);
return TOK_REAL;
return TOK_REALVAL;
}
[0-9][0-9_]*[eE][-+]?[0-9_]+ {
frontend_verilog_yylval.string = new std::string(yytext);
return TOK_REAL;
return TOK_REALVAL;
}
\" { BEGIN(STRING); }

17
frontends/verilog/parser.y
View file

@ -94,7 +94,7 @@ static void free_attr(std::map<std::string, AstNode*> *al)
bool boolean;
}
%token <string> TOK_STRING TOK_ID TOK_CONST TOK_REAL TOK_PRIMITIVE
%token <string> TOK_STRING TOK_ID TOK_CONST TOK_REALVAL TOK_PRIMITIVE
%token ATTR_BEGIN ATTR_END DEFATTR_BEGIN DEFATTR_END
%token TOK_MODULE TOK_ENDMODULE TOK_PARAMETER TOK_LOCALPARAM TOK_DEFPARAM
%token TOK_INPUT TOK_OUTPUT TOK_INOUT TOK_WIRE TOK_REG
@ -103,7 +103,7 @@ static void free_attr(std::map<std::string, AstNode*> *al)
%token TOK_POSEDGE TOK_NEGEDGE TOK_OR
%token TOK_CASE TOK_CASEX TOK_CASEZ TOK_ENDCASE TOK_DEFAULT
%token TOK_FUNCTION TOK_ENDFUNCTION TOK_TASK TOK_ENDTASK
%token TOK_GENERATE TOK_ENDGENERATE TOK_GENVAR
%token TOK_GENERATE TOK_ENDGENERATE TOK_GENVAR TOK_REAL
%token TOK_SYNOPSYS_FULL_CASE TOK_SYNOPSYS_PARALLEL_CASE
%token TOK_SUPPLY0 TOK_SUPPLY1 TOK_TO_SIGNED TOK_TO_UNSIGNED
%token TOK_POS_INDEXED TOK_NEG_INDEXED TOK_ASSERT TOK_PROPERTY
@ -438,6 +438,13 @@ param_integer:
astbuf1->children.back()->children.push_back(AstNode::mkconst_int(0, true));
} | /* empty */;
param_real:
TOK_REAL {
if (astbuf1->children.size() != 1)
frontend_verilog_yyerror("Syntax error.");
astbuf1->children.push_back(new AstNode(AST_REALVALUE));
} | /* empty */;
param_range:
range {
if ($1 != NULL) {
@ -451,7 +458,7 @@ param_decl:
TOK_PARAMETER {
astbuf1 = new AstNode(AST_PARAMETER);
astbuf1->children.push_back(AstNode::mkconst_int(0, true));
} param_signed param_integer param_range param_decl_list ';' {
} param_signed param_integer param_real param_range param_decl_list ';' {
delete astbuf1;
};
@ -459,7 +466,7 @@ localparam_decl:
TOK_LOCALPARAM {
astbuf1 = new AstNode(AST_LOCALPARAM);
astbuf1->children.push_back(AstNode::mkconst_int(0, true));
} param_signed param_integer param_range param_decl_list ';' {
} param_signed param_integer param_real param_range param_decl_list ';' {
delete astbuf1;
};
@ -1133,7 +1140,7 @@ basic_expr:
log_error("Value conversion failed: `%s'\n", $1->c_str());
delete $1;
} |
TOK_REAL {
TOK_REALVAL {
$$ = new AstNode(AST_REALVALUE);
char *p = strdup($1->c_str()), *q;
for (int i = 0, j = 0; !p[j]; j++)