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Added memory_memx pass, "memory -memx", and "prep -memx"

This commit is contained in:
Clifford Wolf 2016-08-19 19:48:26 +02:00
parent f6629b9c29
commit 15ef608453
4 changed files with 121 additions and 4 deletions
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1
passes/memory/Makefile.inc
View File

@ -6,4 +6,5 @@ OBJS += passes/memory/memory_collect.o
OBJS += passes/memory/memory_unpack.o
OBJS += passes/memory/memory_bram.o
OBJS += passes/memory/memory_map.o
OBJS += passes/memory/memory_memx.o

13
passes/memory/memory.cc
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@ -31,14 +31,15 @@ struct MemoryPass : public Pass {
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" memory [-nomap] [-nordff] [-bram <bram_rules>] [selection]\n");
log(" memory [-nomap] [-nordff] [-memx] [-bram <bram_rules>] [selection]\n");
log("\n");
log("This pass calls all the other memory_* passes in a useful order:\n");
log("\n");
log(" memory_dff [-nordff]\n");
log(" memory_dff [-nordff] (-memx implies -nordff)\n");
log(" opt_clean\n");
log(" memory_share\n");
log(" opt_clean\n");
log(" memory_memx (when called with -memx)\n");
log(" memory_collect\n");
log(" memory_bram -rules <bram_rules> (when called with -bram)\n");
log(" memory_map (skipped if called with -nomap)\n");
@ -51,6 +52,7 @@ struct MemoryPass : public Pass {
{
bool flag_nomap = false;
bool flag_nordff = false;
bool flag_memx = false;
string memory_bram_opts;
log_header(design, "Executing MEMORY pass.\n");
@ -66,6 +68,11 @@ struct MemoryPass : public Pass {
flag_nordff = true;
continue;
}
if (args[argidx] == "-memx") {
flag_nordff = true;
flag_memx = true;
continue;
}
if (argidx+1 < args.size() && args[argidx] == "-bram") {
memory_bram_opts += " -rules " + args[++argidx];
continue;
@ -77,6 +84,8 @@ struct MemoryPass : public Pass {
Pass::call(design, flag_nordff ? "memory_dff -nordff" : "memory_dff");
Pass::call(design, "opt_clean");
Pass::call(design, "memory_share");
if (flag_memx)
Pass::call(design, "memory_memx");
Pass::call(design, "opt_clean");
Pass::call(design, "memory_collect");

92
passes/memory/memory_memx.cc Normal file
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@ -0,0 +1,92 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/register.h"
#include "kernel/log.h"
#include <sstream>
#include <set>
#include <stdlib.h>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct MemoryMemxPass : public Pass {
MemoryMemxPass() : Pass("memory_memx", "emulate vlog sim behavior for mem ports") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" memory_memx [selection]\n");
log("\n");
log("This pass adds additional circuitry that emulates the Verilog simulation\n");
log("behavior for out-of-bounds memory reads and writes.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) {
log_header(design, "Executing MEMORY_MEMX pass (converting $mem cells to logic and flip-flops).\n");
extra_args(args, 1, design);
for (auto module : design->selected_modules())
{
vector<Cell*> mem_port_cells;
for (auto cell : module->selected_cells())
if (cell->type.in("$memrd", "$memwr"))
mem_port_cells.push_back(cell);
for (auto cell : mem_port_cells)
{
IdString memid = cell->getParam("\\MEMID").decode_string();
RTLIL::Memory *mem = module->memories.at(memid);
int lowest_addr = mem->start_offset;
int highest_addr = mem->start_offset + mem->size - 1;
SigSpec addr = cell->getPort("\\ADDR");
addr.extend_u0(32);
SigSpec addr_ok = module->Nex(NEW_ID, module->ReduceXor(NEW_ID, addr), module->ReduceXor(NEW_ID, {addr, State::S1}));
if (lowest_addr != 0)
addr_ok = module->LogicAnd(NEW_ID, addr_ok, module->Ge(NEW_ID, addr, lowest_addr));
addr_ok = module->LogicAnd(NEW_ID, addr_ok, module->Le(NEW_ID, addr, highest_addr));
if (cell->type == "$memrd")
{
if (cell->getParam("\\CLK_ENABLE").as_bool())
log_error("Cell %s.%s (%s) has an enabled clock. Clocked $memrd cells are not supported by memory_memx!\n",
log_id(module), log_id(cell), log_id(cell->type));
SigSpec rdata = cell->getPort("\\DATA");
Wire *raw_rdata = module->addWire(NEW_ID, GetSize(rdata));
module->addMux(NEW_ID, SigSpec(State::Sx, GetSize(rdata)), raw_rdata, addr_ok, rdata);
cell->setPort("\\DATA", raw_rdata);
}
if (cell->type == "$memwr")
{
SigSpec en = cell->getPort("\\EN");
en = module->And(NEW_ID, en, addr_ok.repeat(GetSize(en)));
cell->setPort("\\EN", en);
}
}
}
}
} MemoryMemxPass;
PRIVATE_NAMESPACE_END

19
techlibs/common/prep.cc
View File

@ -53,6 +53,10 @@ struct PrepPass : public ScriptPass
log(" passed to 'proc'. uses verilog simulation behavior for verilog if/case\n");
log(" undef handling. this also prevents 'wreduce' from being run.\n");
log("\n");
log(" -memx\n");
log(" simulate verilog simulation behavior for out-of-bounds memory accesses\n");
log(" using the 'memory_memx' pass. This option implies -nordff.\n");
log("\n");
log(" -nordff\n");
log(" passed to 'memory_dff'. prohibits merging of FFs into memory read ports\n");
log("\n");
@ -68,7 +72,7 @@ struct PrepPass : public ScriptPass
}
string top_module, fsm_opts, memory_opts;
bool autotop, flatten, ifxmode;
bool autotop, flatten, ifxmode, memxmode;
virtual void clear_flags() YS_OVERRIDE
{
@ -78,6 +82,7 @@ struct PrepPass : public ScriptPass
autotop = false;
flatten = false;
ifxmode = false;
memxmode = false;
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@ -114,6 +119,11 @@ struct PrepPass : public ScriptPass
ifxmode = true;
continue;
}
if (args[argidx] == "-memx") {
memxmode = true;
memory_opts += " -nordff";
continue;
}
if (args[argidx] == "-nordff") {
memory_opts += " -nordff";
continue;
@ -153,7 +163,10 @@ struct PrepPass : public ScriptPass
if (check_label("coarse"))
{
run(ifxmode ? "proc -ifx" : "proc");
if (help_mode)
run("proc [-ifx]");
else
run(ifxmode ? "proc -ifx" : "proc");
if (help_mode || flatten)
run("flatten", "(if -flatten)");
run("opt_expr -keepdc");
@ -163,6 +176,8 @@ struct PrepPass : public ScriptPass
if (!ifxmode)
run("wreduce");
run("memory_dff" + (help_mode ? " [-nordff]" : memory_opts));
if (help_mode || memxmode)
run("memory_memx", "(if -memx)");
run("opt_clean");
run("memory_collect");
run("opt -keepdc -fast");