Some pmgen reorg, rename peepopt.pmg to peepopt_shiftmul.pmg

Signed-off-by: Clifford Wolf <clifford@clifford.at>

passes/pmgen/Makefile.inc

@@ -16,5 +16,7 @@ passes/pmgen/peepopt.o: passes/pmgen/peepopt_pm.h
 EXTRA_OBJS += passes/pmgen/peepopt_pm.h
 .SECONDARY: passes/pmgen/peepopt_pm.h
 
-passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py passes/pmgen/peepopt.pmg
+PEEPOPT_PATTERN = passes/pmgen/peepopt_shiftmul.pmg
+
+passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py $(PEEPOPT_PATTERN)
 	$(P) mkdir -p passes/pmgen && python3 $< -o $@ -p peepopt $(filter-out $<,$^)

passes/pmgen/pmgen.py

@@ -23,8 +23,7 @@ for o, a in opts:
         debug = True
 
 if outfile is None:
-    outfile = args[-1]
-    args = args[0:-1]
+    outfile = "/dev/stdout"
 
 for a in args:
     assert a.endswith(".pmg")
@@ -246,7 +245,8 @@ if debug:
     pp.pprint(blocks)
 
 with open(outfile, "w") as f:
-    print("// Generated by pmgen.py from {}.pgm".format(prefix), file=f)
+    for fn in pmgfiles:
+        print("// Generated by pmgen.py from {}".format(fn), file=f)
     print("", file=f)
 
     print("#include \"kernel/yosys.h\"", file=f)