genemit.c (main): split insn-emit.c for compiling parallelly

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 2ba76656dbf..3306510a9a8 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1253,6 +1253,13 @@  ANALYZER_OBJS = \
 # We put the *-match.o and insn-*.o files first so that a parallel make
 # will build them sooner, because they are large and otherwise tend to be
 # the last objects to finish building.
+
+insn-generated-split-num = 15
+
+insn-emit-split-c = $(foreach o, $(shell seq 1 $(insn-generated-split-num)), insn-emit$(o).c)
+insn-emit-split-obj = $(patsubst %.c,%.o, $(insn-emit-split-c))
+$(insn-emit-split-c): insn-emit.c
+
 OBJS = \
 gimple-match.o \
 generic-match.o \
@@ -1260,6 +1267,7 @@  OBJS = \
 insn-automata.o \
 insn-dfatab.o \
 insn-emit.o \
+	$(insn-emit-split-obj) \
 insn-extract.o \
 insn-latencytab.o \
 insn-modes.o \
@@ -2367,6 +2375,8 @@  $(simple_generated_c:insn-%.c=s-%): s-%: build/gen%$(build_exeext)
 $(RUN_GEN) build/gen$*$(build_exeext) $(md_file) \
 $(filter insn-conditions.md,$^) > tmp-$*.c
 $(SHELL) $(srcdir)/../move-if-change tmp-$*.c insn-$*.c
+	-csplit insn-$*.c /i\ am\ split\ line/ -k -s {$(insn-generated-split-num)} -f insn-$* -b "%d.c"
+	-( [ ! -s insn-$*0.c ] && for i in `seq 1 $(insn-generated-split-num)`; do touch insn-$*$$i.c; done && echo "" > insn-$*.c)
 $(STAMP) s-$*

 # gencheck doesn't read the machine description, and the file produced
diff --git a/gcc/genemit.c b/gcc/genemit.c
index 84d07d388ee..fd60cdeeb96 100644
--- a/gcc/genemit.c
+++ b/gcc/genemit.c
@@ -847,6 +847,45 @@  handle_overloaded_gen (overloaded_name *oname)
 }
 }

+#define printf_include() \
+ printf ("/* Generated automatically by the program `genemit'\n\
+from the machine description file `md'. */\n\n"); \
+ printf ("#define IN_TARGET_CODE 1\n"); \
+ printf ("#include \"config.h\"\n"); \
+ printf ("#include \"system.h\"\n"); \
+ printf ("#include \"coretypes.h\"\n"); \
+ printf ("#include \"backend.h\"\n"); \
+ printf ("#include \"predict.h\"\n"); \
+ printf ("#include \"tree.h\"\n"); \
+ printf ("#include \"rtl.h\"\n"); \
+ printf ("#include \"alias.h\"\n"); \
+ printf ("#include \"varasm.h\"\n"); \
+ printf ("#include \"stor-layout.h\"\n"); \
+ printf ("#include \"calls.h\"\n"); \
+ printf ("#include \"memmodel.h\"\n"); \
+ printf ("#include \"tm_p.h\"\n"); \
+ printf ("#include \"flags.h\"\n"); \
+ printf ("#include \"insn-config.h\"\n"); \
+ printf ("#include \"expmed.h\"\n"); \
+ printf ("#include \"dojump.h\"\n"); \
+ printf ("#include \"explow.h\"\n"); \
+ printf ("#include \"emit-rtl.h\"\n"); \
+ printf ("#include \"stmt.h\"\n"); \
+ printf ("#include \"expr.h\"\n"); \
+ printf ("#include \"insn-codes.h\"\n"); \
+ printf ("#include \"optabs.h\"\n"); \
+ printf ("#include \"dfp.h\"\n"); \
+ printf ("#include \"output.h\"\n"); \
+ printf ("#include \"recog.h\"\n"); \
+ printf ("#include \"df.h\"\n"); \
+ printf ("#include \"resource.h\"\n"); \
+ printf ("#include \"reload.h\"\n"); \
+ printf ("#include \"diagnostic-core.h\"\n"); \
+ printf ("#include \"regs.h\"\n"); \
+ printf ("#include \"tm-constrs.h\"\n"); \
+ printf ("#include \"ggc.h\"\n"); \
+ printf ("#include \"target.h\"\n\n"); \
+
 int
 main (int argc, const char **argv)
 {
@@ -862,49 +901,19 @@  main (int argc, const char **argv)
 /* Assign sequential codes to all entries in the machine description
 in parallel with the tables in insn-output.c. */

- printf ("/* Generated automatically by the program `genemit'\n\
-from the machine description file `md'. */\n\n");
-
- printf ("#define IN_TARGET_CODE 1\n");
- printf ("#include \"config.h\"\n");
- printf ("#include \"system.h\"\n");
- printf ("#include \"coretypes.h\"\n");
- printf ("#include \"backend.h\"\n");
- printf ("#include \"predict.h\"\n");
- printf ("#include \"tree.h\"\n");
- printf ("#include \"rtl.h\"\n");
- printf ("#include \"alias.h\"\n");
- printf ("#include \"varasm.h\"\n");
- printf ("#include \"stor-layout.h\"\n");
- printf ("#include \"calls.h\"\n");
- printf ("#include \"memmodel.h\"\n");
- printf ("#include \"tm_p.h\"\n");
- printf ("#include \"flags.h\"\n");
- printf ("#include \"insn-config.h\"\n");
- printf ("#include \"expmed.h\"\n");
- printf ("#include \"dojump.h\"\n");
- printf ("#include \"explow.h\"\n");
- printf ("#include \"emit-rtl.h\"\n");
- printf ("#include \"stmt.h\"\n");
- printf ("#include \"expr.h\"\n");
- printf ("#include \"insn-codes.h\"\n");
- printf ("#include \"optabs.h\"\n");
- printf ("#include \"dfp.h\"\n");
- printf ("#include \"output.h\"\n");
- printf ("#include \"recog.h\"\n");
- printf ("#include \"df.h\"\n");
- printf ("#include \"resource.h\"\n");
- printf ("#include \"reload.h\"\n");
- printf ("#include \"diagnostic-core.h\"\n");
- printf ("#include \"regs.h\"\n");
- printf ("#include \"tm-constrs.h\"\n");
- printf ("#include \"ggc.h\"\n");
- printf ("#include \"target.h\"\n\n");
+ long long read_count = 0;

 /* Read the machine description. */

 md_rtx_info info;
 while (read_md_rtx (&info))
+ {
+ if (!(read_count++ % 10000))
+ {
+ printf ("/* i am split line %d :) */\n\n", read_count);
+ printf_include()
+ }
+
 switch (GET_CODE (info.def))
 {
 case DEFINE_INSN:
@@ -929,6 +938,7 @@  from the machine description file `md'. */\n\n");
 default:
 break;
 }
+ }

 /* Write out the routines to add CLOBBERs to a pattern and say whether they
 clobber a hard reg. */