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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