Parallelize regen-cases (#116446)

This makes a huge difference when using `make -j regen-cases`.

Author: gvanrossum

Makefile.pre.in

@@ -1872,39 +1872,72 @@ Objects/obmalloc.o: $(srcdir)/Objects/mimalloc/alloc.c \
 
 Objects/mimalloc/page.o: $(srcdir)/Objects/mimalloc/page-queue.c
 
+
+# Regenerate various files from Python/bytecodes.c
+# Pass CASESFLAG=-l to insert #line directives in the output
+
 .PHONY: regen-cases
-regen-cases:
-	# Regenerate various files from Python/bytecodes.c
-	# Pass CASESFLAG=-l to insert #line directives in the output
+regen-cases: \
+        regen-opcode-ids regen-opcode-targets regen-uop-ids regen-opcode-metadata-py \
+		regen-generated-cases regen-executor-cases regen-optimizer-cases \
+		regen-opcode-metadata regen-uop-metadata
+
+.PHONY: regen-opcode-ids
+regen-opcode-ids:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/opcode_id_generator.py \
 	    -o $(srcdir)/Include/opcode_ids.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Include/opcode_ids.h $(srcdir)/Include/opcode_ids.h.new
+
+.PHONY: regen-opcode-targets
+regen-opcode-targets:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/target_generator.py \
 	    -o $(srcdir)/Python/opcode_targets.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Python/opcode_targets.h $(srcdir)/Python/opcode_targets.h.new
+
+.PHONY: regen-uop-ids
+regen-uop-ids:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/uop_id_generator.py \
 	    -o $(srcdir)/Include/internal/pycore_uop_ids.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Include/internal/pycore_uop_ids.h $(srcdir)/Include/internal/pycore_uop_ids.h.new
+
+.PHONY: regen-opcode-metadata-py
+regen-opcode-metadata-py:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/py_metadata_generator.py \
 	    -o $(srcdir)/Lib/_opcode_metadata.py.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Lib/_opcode_metadata.py $(srcdir)/Lib/_opcode_metadata.py.new
+
+.PHONY: regen-generated-cases
+regen-generated-cases:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/tier1_generator.py \
 	    -o $(srcdir)/Python/generated_cases.c.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Python/generated_cases.c.h $(srcdir)/Python/generated_cases.c.h.new
+
+.PHONY: regen-executor-cases
+regen-executor-cases:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/tier2_generator.py \
 	    -o $(srcdir)/Python/executor_cases.c.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Python/executor_cases.c.h $(srcdir)/Python/executor_cases.c.h.new
+
+.PHONY: regen-optimizer-cases
+regen-optimizer-cases:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/optimizer_generator.py \
 	    -o $(srcdir)/Python/optimizer_cases.c.h.new \
 	    $(srcdir)/Python/optimizer_bytecodes.c \
 	    $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Python/optimizer_cases.c.h $(srcdir)/Python/optimizer_cases.c.h.new
+
+.PHONY: regen-opcode-metadata
+regen-opcode-metadata:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/opcode_metadata_generator.py \
 	    -o $(srcdir)/Include/internal/pycore_opcode_metadata.h.new $(srcdir)/Python/bytecodes.c
+	$(UPDATE_FILE) $(srcdir)/Include/internal/pycore_opcode_metadata.h $(srcdir)/Include/internal/pycore_opcode_metadata.h.new
+
+.PHONY: regen-uop-metadata
+regen-uop-metadata:
 	$(PYTHON_FOR_REGEN) $(srcdir)/Tools/cases_generator/uop_metadata_generator.py -o \
 	    $(srcdir)/Include/internal/pycore_uop_metadata.h.new $(srcdir)/Python/bytecodes.c
-	$(UPDATE_FILE) $(srcdir)/Python/generated_cases.c.h $(srcdir)/Python/generated_cases.c.h.new
-	$(UPDATE_FILE) $(srcdir)/Include/opcode_ids.h $(srcdir)/Include/opcode_ids.h.new
-	$(UPDATE_FILE) $(srcdir)/Include/internal/pycore_uop_ids.h $(srcdir)/Include/internal/pycore_uop_ids.h.new
-	$(UPDATE_FILE) $(srcdir)/Python/opcode_targets.h $(srcdir)/Python/opcode_targets.h.new
-	$(UPDATE_FILE) $(srcdir)/Include/internal/pycore_opcode_metadata.h $(srcdir)/Include/internal/pycore_opcode_metadata.h.new
 	$(UPDATE_FILE) $(srcdir)/Include/internal/pycore_uop_metadata.h $(srcdir)/Include/internal/pycore_uop_metadata.h.new
-	$(UPDATE_FILE) $(srcdir)/Python/executor_cases.c.h $(srcdir)/Python/executor_cases.c.h.new
-	$(UPDATE_FILE) $(srcdir)/Python/optimizer_cases.c.h $(srcdir)/Python/optimizer_cases.c.h.new
-	$(UPDATE_FILE) $(srcdir)/Lib/_opcode_metadata.py $(srcdir)/Lib/_opcode_metadata.py.new
+
 
 Python/compile.o: $(srcdir)/Include/internal/pycore_opcode_metadata.h