diff options
Diffstat (limited to 'frontends')
| -rw-r--r-- | frontends/ast/ast.cc | 6 | ||||
| -rw-r--r-- | frontends/ast/ast.h | 1 | ||||
| -rw-r--r-- | frontends/ast/simplify.cc | 121 |
3 files changed, 98 insertions, 30 deletions
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc index 9520ae32c..c8183580b 100644 --- a/frontends/ast/ast.cc +++ b/frontends/ast/ast.cc @@ -336,6 +336,12 @@ void AstNode::dumpAst(FILE *f, std::string indent) const fprintf(f, " %d", v); fprintf(f, " ]"); } + if (!multirange_swapped.empty()) { + fprintf(f, " multirange_swapped=["); + for (auto v : multirange_swapped) + fprintf(f, " %d", v); + fprintf(f, " ]"); + } if (is_enum) { fprintf(f, " type=enum"); } diff --git a/frontends/ast/ast.h b/frontends/ast/ast.h index 203b50021..1b8ed22ca 100644 --- a/frontends/ast/ast.h +++ b/frontends/ast/ast.h @@ -202,6 +202,7 @@ namespace AST // if this is a multirange memory then this vector contains offset and length of each dimension std::vector<int> multirange_dimensions; + std::vector<bool> multirange_swapped; // true if range is swapped, not used for structs // this is set by simplify and used during RTLIL generation AstNode *id2ast; diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc index 0ba2ab6ac..52dfc575f 100644 --- a/frontends/ast/simplify.cc +++ b/frontends/ast/simplify.cc @@ -1504,11 +1504,14 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage, { int total_size = 1; multirange_dimensions.clear(); + multirange_swapped.clear(); for (auto range : children[1]->children) { if (!range->range_valid) log_file_error(filename, location.first_line, "Non-constant range on memory decl.\n"); multirange_dimensions.push_back(min(range->range_left, range->range_right)); multirange_dimensions.push_back(max(range->range_left, range->range_right) - min(range->range_left, range->range_right) + 1); + log_file_warning(filename, location.first_line, "left:%d right:%d\n", range->range_left, range->range_right); + multirange_swapped.push_back(range->range_swapped); total_size *= multirange_dimensions.back(); } delete children[1]; @@ -2831,26 +2834,28 @@ skip_dynamic_range_lvalue_expansion:; goto apply_newNode; } - if (str == "\\$size" || str == "\\$bits") + if (str == "\\$size" || str == "\\$bits" || str == "\\$high" || str == "\\$low" || str == "\\$left" || str == "\\$right") { - if (str == "\\$bits" && children.size() != 1) - log_file_error(filename, location.first_line, "System function %s got %d arguments, expected 1.\n", - RTLIL::unescape_id(str).c_str(), int(children.size())); - - if (str == "\\$size" && children.size() != 1 && children.size() != 2) - log_file_error(filename, location.first_line, "System function %s got %d arguments, expected 1 or 2.\n", - RTLIL::unescape_id(str).c_str(), int(children.size())); - int dim = 1; - if (str == "\\$size" && children.size() == 2) { - AstNode *buf = children[1]->clone(); - // Evaluate constant expression - while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { } - dim = buf->asInt(false); - delete buf; + if (str == "\\$bits") { + if (children.size() != 1) + log_file_error(filename, location.first_line, "System function %s got %d arguments, expected 1.\n", + RTLIL::unescape_id(str).c_str(), int(children.size())); + } else { + if (children.size() != 1 && children.size() != 2) + log_file_error(filename, location.first_line, "System function %s got %d arguments, expected 1 or 2.\n", + RTLIL::unescape_id(str).c_str(), int(children.size())); + if (children.size() == 2) { + AstNode *buf = children[1]->clone(); + // Evaluate constant expression + while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { } + dim = buf->asInt(false); + delete buf; + } } 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 AstNode *id_ast = NULL; // Is this needed? @@ -2863,6 +2868,32 @@ skip_dynamic_range_lvalue_expansion:; id_ast = current_scope.at(buf->str); if (!id_ast) log_file_error(filename, location.first_line, "Failed to resolve identifier %s for width detection!\n", buf->str.c_str()); + // a slice of our identifier means we advance to the next dimension, e.g. $size(a[3]) + if (buf->children.size() > 0) { + // we give up here because when we try to support thing such as $size(a[1][1]) the AST at this point doesn't contain + // the information how many indexes were given. The array is already flattened and a composite index is given in the AST instead. + log_file_error(filename, location.first_line, "%s() only supported for pure identifiers (no further indexing)!\n", str.c_str()); + // something is hanging below this identifier + if (buf->children[0]->type == AST_RANGE) + dim++; + // more than one range, e.g. $size(a[3][2]) + else if (buf->children[0]->type == AST_MULTIRANGE) + dim += buf->children[0]->children.size(); // increment by multirange size + } + // We have 4 cases: + // AST_WIRE, no AST_RANGE children + // AST_WIRE, AST_RANGE children + // AST_MEMORY, two AST_RANGE children (1st for packed, 2nd for unpacked) + // AST_MEMORY, one AST_RANGE child (0) for packed, then AST_MULTIRANGE child (1) for unpacked + // case 0 handled by default + if ((id_ast->type == AST_WIRE || id_ast->type == AST_MEMORY) && id_ast->children.size() > 0) { + // handle packed array left/right for case 1, and cases 2/3 when requesting the last dimension (packed side) + AstNode *wire_range = id_ast->children[0]; + left = wire_range->children[0]->integer; + right = wire_range->children[1]->integer; + high = max(left, right); + low = min(left, right); + } if (id_ast->type == AST_MEMORY) { // We got here only if the argument is a memory // Otherwise $size() and $bits() return the expression width @@ -2875,29 +2906,59 @@ skip_dynamic_range_lvalue_expansion:; } else log_file_error(filename, location.first_line, "Unknown memory depth AST type in `%s'!\n", buf->str.c_str()); } else { - // $size() + // $size(), $left(), $right(), $high(), $low() + int dims = 1; if (mem_range->type == AST_RANGE) { - if (!mem_range->range_valid) - log_file_error(filename, location.first_line, "Failed to detect width of memory access `%s'!\n", buf->str.c_str()); - int dims; - if (id_ast->multirange_dimensions.empty()) - dims = 1; - else + if (id_ast->multirange_dimensions.empty()) { + if (!mem_range->range_valid) + log_file_error(filename, location.first_line, "Failed to detect width of memory access `%s'!\n", buf->str.c_str()); + if (dim == 1) { + left = mem_range->range_right; + right = mem_range->range_left; + high = max(left, right); + low = min(left, right); + } + } else { dims = GetSize(id_ast->multirange_dimensions)/2; - if (dim == 1) - width_hint = (dims > 1) ? id_ast->multirange_dimensions[1] : (mem_range->range_left - mem_range->range_right + 1); - else if (dim <= dims) { - width_hint = id_ast->multirange_dimensions[2*dim-1]; - } else if ((dim > dims+1) || (dim < 0)) - log_file_error(filename, location.first_line, "Dimension %d out of range in `%s', as it only has dimensions 1..%d!\n", dim, buf->str.c_str(), dims+1); - } else + if (dim <= dims) { + width_hint = id_ast->multirange_dimensions[2*dim-1]; + high = id_ast->multirange_dimensions[2*dim-2] + id_ast->multirange_dimensions[2*dim-1] - 1; + low = id_ast->multirange_dimensions[2*dim-2]; + if (id_ast->multirange_swapped[dim-1]) { + left = low; + right = high; + } else { + right = low; + left = high; + } + } else if ((dim > dims+1) || (dim < 0)) + log_file_error(filename, location.first_line, "Dimension %d out of range in `%s', as it only has dimensions 1..%d!\n", dim, buf->str.c_str(), dims+1); + } + } else { log_file_error(filename, location.first_line, "Unknown memory depth AST type in `%s'!\n", buf->str.c_str()); + } } } + width = high - low + 1; + } else { + width = width_hint; } delete buf; + if (str == "\\$high") + result = high; + else if (str == "\\$low") + result = low; + else if (str == "\\$left") + result = left; + else if (str == "\\$right") + result = right; + else if (str == "\\$size") + result = width; + else { + result = width * mem_depth; + } - newNode = mkconst_int(width_hint * mem_depth, false); + newNode = mkconst_int(result, false); goto apply_newNode; } |