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Add support for $dimensions and $unpacked_dimensions

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Dag Lem 2023-12-28 00:23:59 +01:00 • committed by Zachary Snow
parent 2125357e76
commit e0d3977e19
3 changed files with 46 additions and 3 deletions
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19
frontends/ast/simplify.cc
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@ -3487,10 +3487,11 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (str == "\\$increment" || str == "\\$size" || str == "\\$bits" || str == "\\$high" || str == "\\$low" || str == "\\$left" || str == "\\$right")
if (str == "\\$dimensions" || str == "\\$unpacked_dimensions" ||
str == "\\$increment" || str == "\\$size" || str == "\\$bits" || str == "\\$high" || str == "\\$low" || str == "\\$left" || str == "\\$right")
{
int dim = 1;
if (str == "\\$bits") {
if (str == "\\$dimensions" || str == "\\$unpacked_dimensions" || str == "\\$bits") {
if (children.size() != 1)
input_error("System function %s got %d arguments, expected 1.\n",
RTLIL::unescape_id(str).c_str(), int(children.size()));
@ -3509,6 +3510,7 @@ skip_dynamic_range_lvalue_expansion:;
AstNode *buf = children[0]->clone();
int mem_depth = 1;
int result, high = 0, low = 0, left = 0, right = 0, width = 1; // defaults for a simple wire
int expr_dimensions = 0, expr_unpacked_dimensions = 0;
AstNode *id_ast = NULL;
buf->detectSignWidth(width_hint, sign_hint);
@ -3534,6 +3536,10 @@ skip_dynamic_range_lvalue_expansion:;
// or if the second argument is out of range, then 'x shall be returned."
if (dim < 1 || dim > dims)
input_error("Dimension %d out of range in `%s', as it only has %d dimensions!\n", dim, id_ast->str.c_str(), dims);
expr_dimensions = dims - dim + 1;
expr_unpacked_dimensions = std::max(id_ast->unpacked_dimensions - dim + 1, 0);
right = low = id_ast->dimensions[dim - 1].range_right;
left = high = low + id_ast->dimensions[dim - 1].range_width - 1;
if (id_ast->dimensions[dim - 1].range_swapped) {
@ -3546,9 +3552,16 @@ skip_dynamic_range_lvalue_expansion:;
width = high - low + 1;
} else {
width = width_hint;
right = low = 0;
left = high = width - 1;
expr_dimensions = 1;
}
delete buf;
if (str == "\\$high")
if (str == "\\$dimensions")
result = expr_dimensions;
else if (str == "\\$unpacked_dimensions")
result = expr_unpacked_dimensions;
else if (str == "\\$high")
result = high;
else if (str == "\\$low")
result = low;