riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

prep: add -barriers flag 

* This uses optbarriers and flatten -barriers to insert barriers on
  public wires in the design, limiting the optimization that can affect
  them
This commit is contained in:
George Rennie 2024-11-20 17:40:18 +01:00
parent c6e8fb2432
commit 33d5138673
1 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
techlibs/common/prep.cc
View File

@ -67,6 +67,11 @@ struct PrepPass : public ScriptPass
log(" -nokeepdc\n");
log(" do not call opt_* with -keepdc\n");
log("\n");
log(" -barriers\n");
log(" add optimization barriers to all public wires to preserve their structure.\n");
log(" this limits the optimizations that can be applied to the design to only\n");
log(" those involving private wires.\n");
log("\n");
log(" -run <from_label>[:<to_label>]\n");
log(" only run the commands between the labels (see below). an empty\n");
log(" from label is synonymous to 'begin', and empty to label is\n");
@ -79,7 +84,7 @@ struct PrepPass : public ScriptPass
}
string top_module, fsm_opts;
bool autotop, flatten, ifxmode, memxmode, nomemmode, nokeepdc, rdff;
bool autotop, flatten, ifxmode, memxmode, nomemmode, nokeepdc, rdff, barriers;
void clear_flags() override
{
@ -92,6 +97,7 @@ struct PrepPass : public ScriptPass
nomemmode = false;
nokeepdc = false;
rdff = false;
barriers = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -148,6 +154,10 @@ struct PrepPass : public ScriptPass
nokeepdc = true;
continue;
}
if (args[argidx] == "-barriers") {
barriers = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -183,12 +193,16 @@ struct PrepPass : public ScriptPass
if (check_label("coarse"))
{
if (help_mode || barriers)
run("optbarriers", "(if -barriers)");
if (help_mode)
run("proc [-ifx]");
else
run(ifxmode ? "proc -ifx" : "proc");
if (help_mode || flatten)
run("flatten", "(if -flatten)");
if (help_mode)
run("flatten [-barriers]", "(if -flatten)");
else if (flatten)
run(barriers ? "flatten -barriers" : "flatten");
run("future");
run(nokeepdc ? "opt_expr" : "opt_expr -keepdc");
run("opt_clean");