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Added $bits() for memories as well.

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This commit is contained in:
Udi Finkelstein 2017-09-26 09:11:25 +03:00
parent 17f8b41605
commit 2dea42e903
2 changed files with 31 additions and 8 deletions
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28
frontends/ast/simplify.cc
View file

@ -1870,19 +1870,43 @@ skip_dynamic_range_lvalue_expansion:;
goto apply_newNode;
}
if (str == "\\$size")
if (str == "\\$size" || str == "\\$bits")
{
if (children.size() != 1)
log_error("System function %s got %d arguments, expected 1 at %s:%d.\n",
RTLIL::unescape_id(str).c_str(), int(children.size()), filename.c_str(), linenum);
AstNode *buf = children[0]->clone();
int mem_depth = 1;
AstNode *id_ast = NULL;
// Is this needed?
//while (buf->simplify(true, false, false, stage, width_hint, sign_hint, false)) { }
buf->detectSignWidth(width_hint, sign_hint);
if (str == "\\$bits") {
if (buf->type == AST_IDENTIFIER) {
id_ast = buf->id2ast;
if (id_ast == NULL && current_scope.count(buf->str))
id_ast = current_scope.at(buf->str);
if (!id_ast)
log_error("Failed to resolve identifier %s for width detection at %s:%d!\n", buf->str.c_str(), filename.c_str(), linenum);
if (id_ast->type == AST_MEMORY) {
AstNode *mem_range = id_ast->children[1];
if (mem_range->type == AST_RANGE) {
if (!mem_range->range_valid)
log_error("Failed to detect width of memory access `%s' at %s:%d!\n", mem_range->str.c_str(), filename.c_str(), linenum);
mem_depth = mem_range->range_left - mem_range->range_right + 1;
} else if (mem_range->type == AST_MULTIRANGE) {
for (auto n : mem_range->children)
mem_depth *= (n->range_left - n->range_right + 1);
} else
log_error("Unknown memory depth AST type in `%s' at %s:%d!\n", mem_range->str.c_str(), filename.c_str(), linenum);
}
}
}
delete buf;
newNode = mkconst_int(width_hint, false);
newNode = mkconst_int(width_hint * mem_depth, false);
goto apply_newNode;
}

11
tests/simple/functions01.sv
View file

@ -1,4 +1,5 @@
module functions01;
wire [3:0]x;
wire [$size(x)-1:0]x_size;
wire [$size({x, x})-1:0]xx_size;
@ -7,11 +8,9 @@ wire [$size(y)-1:0]y_size;
wire [3:0]z[0:5][0:7];
wire [$size(z)-1:0]z_size;
//
// The following are not supported yet:
//
//wire [$bits(x)-1:0]x_bits;
//wire [$bits({x, x})-1:0]xx_bits;
wire [$bits(x)-1:0]x_bits;
wire [$bits({x, x})-1:0]xx_bits;
wire [$bits(y)-1:0]y_bits;
wire [$bits(z)-1:0]z_bits;
endmodule