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Implemented dynamic bit-/part-select for memory writes

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This commit is contained in:
Clifford Wolf 2014-07-17 16:49:23 +02:00
parent f1ca93a0a3
commit 9b183539af
2 changed files with 66 additions and 3 deletions
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28
frontends/ast/simplify.cc
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@ -1159,7 +1159,7 @@ skip_dynamic_range_lvalue_expansion:;
std::string id_addr = sstr.str() + "_ADDR", id_data = sstr.str() + "_DATA", id_en = sstr.str() + "_EN";
if (type == AST_ASSIGN_EQ)
log("Warining: Blocking assignment to memory in line %s:%d is handled like a non-blocking assignment.\n",
log("Warning: Blocking assignment to memory in line %s:%d is handled like a non-blocking assignment.\n",
filename.c_str(), linenum);
int mem_width, mem_size, addr_bits;
@ -1230,7 +1230,31 @@ skip_dynamic_range_lvalue_expansion:;
}
else
{
log_error("Writing to memories with dynamic bit- or part-select is not supported yet at %s:%d.\n", filename.c_str(), linenum);
AstNode *the_range = children[0]->children[1];
AstNode *left_at_zero_ast = the_range->children[0]->clone();
AstNode *right_at_zero_ast = the_range->children.size() >= 2 ? the_range->children[1]->clone() : left_at_zero_ast->clone();
AstNode *offset_ast = right_at_zero_ast->clone();
while (left_at_zero_ast->simplify(true, true, false, 1, -1, false, false)) { }
while (right_at_zero_ast->simplify(true, true, false, 1, -1, false, false)) { }
if (left_at_zero_ast->type != AST_CONSTANT || right_at_zero_ast->type != AST_CONSTANT)
log_error("Unsupported expression on dynamic range select on signal `%s' at %s:%d!\n", str.c_str(), filename.c_str(), linenum);
int width = left_at_zero_ast->integer - right_at_zero_ast->integer + 1;
for (int i = 0; i < mem_width; i++)
set_bits_en[i] = i < width ? RTLIL::State::S1 : RTLIL::State::S0;
assign_data = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER),
new AstNode(AST_SHIFT_LEFT, children[1]->clone(), offset_ast->clone()));
assign_data->children[0]->str = id_data;
assign_en = new AstNode(AST_ASSIGN_LE, new AstNode(AST_IDENTIFIER),
new AstNode(AST_SHIFT_LEFT, mkconst_bits(set_bits_en, false), offset_ast->clone()));
assign_en->children[0]->str = id_en;
delete left_at_zero_ast;
delete right_at_zero_ast;
delete offset_ast;
}
}
else