add some basic benchmarks

1 files changed, 47 insertions, 0 deletions

diff --git a/benchmarks/scripts/makefile b/benchmarks/scripts/makefile
new file mode 100644
index 0000000..7140c05
--- /dev/null
+++ b/benchmarks/scripts/makefile
@@ -0,0 +1,47 @@
+.PHONY: all
+all: benchmark
+
+ARCH		?= riscv64
+CROSS_COMPILE	?= $(ARCH)-unknown-elf-
+
+LLVM		?= 0
+COMPILER	!= [ "$(LLVM)" != "0" ] \
+			&& echo clang --target="$(CROSS_COMPILE)" \
+			|| echo $(CROSS_COMPILE)gcc
+
+include common/arch/$(ARCH)/source.mk
+
+OBFLAGS		:= -ffreestanding -nostdlib -std=c17 -g -O2
+INCLUDEFLAGS	:= -I ../include -I.
+WARNFLAGS	:= -Wall -Wextra
+DEPFLAGS	= -MT $@ -MMD -MP -MF $@.d
+COMPILE_BENCHMARK	= $(COMPILER) $(WARNFLAGS) $(INCLUDEFLAGS) \
+			  $(DEPFLAGS) $(OBFLAGS) $(ARCH_FLAGS)
+
+GEN_INITRD	:= cpio -H newc -o >
+
+# icount gives a rough approximation of how many instructions are executed, but
+# *actual* performance would still have to be measured on real systems
+QEMU		:= qemu-system-$(ARCH) -machine virt -kernel ../kmi.bin \
+		   -serial stdio \
+		   -monitor none \
+		   -nographic \
+		   -no-reboot \
+		   -m 128M \
+		   -icount 0 \
+		   -initrd
+
+KMI		:= ../kmi.bin
+COMMON		:= build/printf.o
+
+build/printf.o: common/printf.c $(KMI)
+	$(COMPILE_BENCHMARK) -c common/printf.c -o build/printf.o
+
+BENCHMARKS :=
+include benchmarks.mk
+
+.PHONY: benchmark
+benchmark: $(BENCHMARKS)
+	@cd reports; for d in * ; do				\
+		printf "%8s: " "$$d"; tail -n 1 $$d/log | tr -d '\r' | bc -l;	\
+	done